Pillar Bedding a Sako 85 - Range Report - WARNING 32 Photos!

RangerPark

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Range Report on page 2.

Hello Everyone!

I just finished pillar bedding my new Sako 85 Greywolf in .375 H&H. I found the internet lacking in good tutorials compared to bedding a Remington 700, for example. This was my third bedding job. I made some mistakes that I thought I would share. In the end it was a complete success so here we go.

I again used Devcon, but this time I also got my hands on some Kiwi shoe polish. I was using the release agent from a Miles Gilbert bedding kit before. Let's just say the Kiwi is many times better!

In the first two pictures you can see the original stock inletting. I found the Sako 85 to be very well inletted. The recoil lug was removed for the photos.

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Next, I opened up the action screw holes to 1/2" with a counterbore, 5/16" pilot. I first had to open up the holes with a reamer as they were some weird metric size none of my pilots would fit in. You can already see stock compression at the rear screw, no regrets on the pillars.

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I trimmed the pillars to length. You can see the rear pillar sticking out quite a bit. This is the original gap between the bottom of the screw lug and the stock. I have the pillars trimmed to come in contact with both the floorplate and the action.

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This time around I did each bedding step separately. Something I learned from my last bedding job. First on the list were the pillars. I used the floor plate to index the height.

IMG_20170219_175314.jpg

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The finished pillars. They looked the way they should.

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Problem!!! As I was trimming my pillars I suspected the floorplate wasn't quite parallel with the action. This confirmed it. Both pillars were trimmed with .002" flatness between both ends. The front of the floorplate would pop out when when I did the rear screw. I was hoping to get away without bedding the floorplate, not this time!

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Next step was to bed the floorplate. I relieved the area enough to reach the wood. Next time I would relieve it even more, some places had pretty thin epoxy in the end. Notice the recess by the front pillar. It served no purpose and was filled in.

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The finished floorplate bedding. I only did a rough clean up job. I have Lee Valley needle files on their way, I'll finish cleaning up once they get here.

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Decision time. You can see the gap between the recoil lug and the barrel. I could have bedded the recoil lug separately so it could be removed or I could have buried the plate in Devcon to better support the barrel. I went with the second option. I can't see any use in removing the recoil lug after the bedding job is finished, so it got buried in place.

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Prepping to bed the action. My only regret was not using more clay. Next time around I won't be using any tape at all. I'll simply coat everything I don't want bedded with clay. The front of the stock is already generously relieved from the factory. There's tons of room for bedding compound in there. If I didn't know any better I'd say Sako did this on purpose, making bedding practically a requirement.

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I started with the recoil lug. I coated both the stock and the lug and pressed it in place. It offered quite a bit of resistance. There wasn't much of a gap in the lug recess for the epoxy to flow.

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Next, I coated all the parts to be bedded, both on the stock and the action. The recoil lug was buried in Devcon, never to be seen again.

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The action was held in place with a rubber band. This is the part where you start wondering if you forgot to coat anything with polish. One drawback of using a rubber band was that I was unable to clean up inside the magazine well afterwards.

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24 hours later. Perfect bedding impression. A bit too much epoxy in some places. It's when I was cleaning up the mess that I wished I used more clay instead of tape.

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Rough clean up job. I'll make it pretty later. The way I bedded the rear screw boss I created a secondary recoil lug. I'll relieve it when the new needle files come in. Looks a bit rough but I'm happy with the result. The Devcon also created a second recoil lug at the front. There are many people who think this is the way a Sako 85 recoil lug ought to look like. It's pretty but no doubt it will snap off after a couple of shots. I'll clean it up then.

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The action and stock were reunited after the clean up. Everything fitted perfectly.

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This wasn't my prettiest bedding job, a bit of a diamond in the rough still, but it was by far the most effective one I've done. Under .001" barrel movement after the action screws were tightened. I'll venture forth and call the job a complete success.

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This is the final set up. Everything is back in place. The mags and dummy rounds feed flawlessly. I will be using an Aimpoint H34L, very excited to try it out. It's mounted in 34mm Ken Farrell rings and rests on a NEAR rail. I'm using a generic Amazon cheek pad. I wasted a lot of time trying to get the lowest 34mm rings I could find. In the end it didn't matter, I still needed quite a bit of cheek padding for a proper cheek weld. Next time I'll use Leupold PRW 34mm rings. Just a bit higher, almost 1/3 of the price.

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So the real question is, how does it shoot? Well I have no idea. I moved last October and won't have access to a range until April 1. I'll know for sure then! If you read all this I hope you found the post informative and useful.

Cheers!
 

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Last edited:
Great job on the thread.
One day I'll grow a pair of kahjones and try to bed something.
Need someone to hold me hand while I try this out though.
 
Great job on the thread.
One day I'll grow a pair of kahjones and try to bed something.
Need someone to hold me hand while I try this out though.

Same here.
I have a Boyd's for my Vanguard 223, and while it fits quite nice, I really want to try bedding it. I just haven't gathered the courage yet.
 
Great job ! I'm interested in how you measured your desired post length


Care to consult on a Sako 75 varmint in 7rem mag ? Where did you get your posts ?
 
RP, you did a nice job. I think the bedding in front of the recoil lug will stand up better than you think it will. I like Sako rifles a lot but I've never had one shoot to its full potential out of the box. Every one I've used has had to have a bedding job done. I'm not saying they aren't acceptable for most hunting conditions as factory provided but usually they are capable of exceptional accuracy with loads they like.

I use Devcon Titanium Putty almost exclusively for my personal bedding jobs. Doesn't run all over the place and is very tough with little to no shrinkage once it's cured. As for bedding release, I agree Kiwi paste shoe polish is hard to beat and only leaves and extremely thing coat. If you can find it, Johnson's Paste Wax is every bit as good and a lot cheaper. I do a lot of glass bedding and don't quibble much on the cost of a release agent but you can get close to a lifetime supply from one can of paste wax.

The thing about the excellent job you did had nothing to do with luck. There is no rocket science involved in any gunsmithing. What it takes is patience to do it right the first time. That's where Bubba continues to screw up. Bubba gets impatient or uses the wrong tools appropriate for the job. When it's done right it looks and works right.
 
Thanks for all the comments folks. It took me about 4 days to get the job done, a little bit every day. Documenting and sharing the process was a goal from the start, it made me pause and be deliberate in my approach.

Great job on the thread.
One day I'll grow a pair of kahjones and try to bed something.
Need someone to hold me hand while I try this out though.

Same here. I have a Boyd's for my Vanguard 223, and while it fits quite nice, I really want to try bedding it. I just haven't gathered the courage yet.

For your first bedding job try to be smarter than I was! My first job was bedding a Remington 700 in a McMillan A5. I did everything in one step and nearly ended up with a permanently bonded mess. The epoxy part of bedding is about 10% of the job. The rest is all prep. Just like reloading really, it's all about the prep. Starting with a Boyd's would be ideal. Remember, break down the job in steps and take your time. 1- Pillars. 2- DBM / Floorplate (if required). 3- Action. 4- Barrel channel (if required). 5- Touch ups.

Great job ! I'm interested in how you measured your desired post length. Care to consult on a Sako 75 varmint in 7rem mag ? Where did you get your posts ?

I got my posts from MCRS Tactical. He's in Calgary and sells them on Ebay. I like the fact that they're knurled and grooved. People with access to a lathe would have a seizure from the price though. I paid for convenience and speedy service. He'll make them the day you order. I do find he's rather lax with his tolerances, a byproduct of his speedy service. Get the custom length ones, he'll make them at 1.300".

To trim the pillars, mate the action to the stock, hold in place with a rubber band if required, remove the floorplate and work from the bottom. The pillars will contact the screw boss and you'll trim it flush with the floorplate. I used a cutting wheel and metal files. I also used a dial indicator to ensure they were trimmed parallel. The floorplate on the Sako 85 wasn't quite parallel to the action. If the 75 is the same, cut them short from the bottom and bed the floorplate.

RP, you did a nice job. I think the bedding in front of the recoil lug will stand up better than you think it will. I like Sako rifles a lot but I've never had one shoot to its full potential out of the box. Every one I've used has had to have a bedding job done. I'm not saying they aren't acceptable for most hunting conditions as factory provided but usually they are capable of exceptional accuracy with loads they like.

I use Devcon Titanium Putty almost exclusively for my personal bedding jobs. Doesn't run all over the place and is very tough with little to no shrinkage once it's cured. As for bedding release, I agree Kiwi paste shoe polish is hard to beat and only leaves and extremely thing coat. If you can find it, Johnson's Paste Wax is every bit as good and a lot cheaper. I do a lot of glass bedding and don't quibble much on the cost of a release agent but you can get close to a lifetime supply from one can of paste wax.

The thing about the excellent job you did had nothing to do with luck. There is no rocket science involved in any gunsmithing. What it takes is patience to do it right the first time. That's where Bubba continues to screw up. Bubba gets impatient or uses the wrong tools appropriate for the job. When it's done right it looks and works right.

Thanks! After doing this job, I sincerely believe the Sako 85 is made to be bedded, especially at the front. There's just too much open space between the action and the stock. The Sako inletting is otherwise perfect, no slop at all from left to right, a little bit of play from front to back due to the recoil lug design.
 
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It's too bad you did not do a series of accuracy tests before alterations.

As good as your work is in this case (and I find no fault with it) I seriously doubt you will be able to measure a difference in accuracy now that it has pillars installed... 2 reasons: 1; because of the caliber and 2; that the density of the laminated wood is extremely stable to start with. But nice job for sure... and the next one will be easier for you...
 
It's too bad you did not do a series of accuracy tests before alterations.

As good as your work is in this case (and I find no fault with it) I seriously doubt you will be able to measure a difference in accuracy now that it has pillars installed... 2 reasons: 1; because of the caliber and 2; that the density of the laminated wood is extremely stable to start with. But nice job for sure... and the next one will be easier for you...

Thank you! And I couldn't agree with you more. However this spring will be a bit of a time crunch. We moved in the fall and I won't have access to a new range before April 1. This will also be opening day for spring bear in Alberta, the main reason I got the rifle. So not much time for troubleshooting the rifle. With the bedding out of the way I'll know to look elsewhere if the rifle won't group. I plan to dedicate the first weekend of April to breaking in the rifle and getting enough trigger time to be proficient with it, then it's straight to the hunt. Hopefully it won't let me down.
 
Good job there, I have a 85 also. I had problems with the little recoil plate screws not staying snug. I just bedded the plate. Made no difference in groups that I can tell.
 
Thanks for this; great job. I've been itching to try my first bedding job; I have an older Savage set aside for it, something I won't be too upset with if I mess it up, but it's hard to be sure of the steps - this will help!
 
could anyone point me to a good pillar tubing? preferably one that can be found at local hardware stores? i'm going to pillar bed an M70 stock (eventually bed it as well)
also is J-B weld good enough for bedding? im confident it will be fine for pillars but wondering about full bedding
 
could anyone point me to a good pillar tubing? preferably one that can be found at local hardware stores? i'm going to pillar bed an M70 stock (eventually bed it as well)
also is J-B weld good enough for bedding? im confident it will be fine for pillars but wondering about full bedding

A while back I was recommended lamp ferrules for pillars. Thing is I'm still not sure where to find some. My target 700 has molded in pillars with Devcon and it's very accurate. Everyone that's used JB Weld says it's good enough. Just make sure you're not using 5 minutes epoxy, you'll run out of time. Something with a 40+ minutes pot life will work.
 
yes, i picked the slow setting J-B, i'm in no rush to hand it set properly :)
i had those in my hand last night, instead went with steel niple, but now i think it will be too hard to work with/cut and trim to size

sorry for highjacking thread
 
Range Report

So the time finally came to give the new rifle a spin. Shooting for groups with an Aimpoint being somewhat futile, I put a Nightforce on it for this range session. As much as the combo looks good it's utterly useless for hunting as the shells his the windage turret on the way out, hard and every time.

As a quick disclaimer, shooting a .375 H&H off the bench just plain sucks. It doesn't matter how many sandbags you use and where, it still kicks like a mule. This is also the reason all groups measured are 3 round groups. I'm gonna have to dry fire for a week to get rid of the flinch now.

IMG_20170401_134937230_zpsuuafmdj0.jpg



First group after sighting in is Federal Power Shock 270 grains. Just over 1 MOA, I'll take it. Could probably improve with practice, but I've had enough bench time with the beast already.

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Next groups are from a ladder, Hornady cases, Federal 215M primers, H4350 and Sierra 300gr Gamekings.

Top right: 77 grains, 1.71 MOA. This was the first group in the ladder. This is when I realized I needed a serious crimp. The rounds in the mag got .020" shorter for every shot fired, hence the vertical. Fired the rest of the ladder by single loading.

Bottom Right: 77.5 grains, .94 MOA

Top left: 78 grains, 1.15 MOA.

Bottom Left: 78.5 grains, 1.10 MOA

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Right: 79 grains, 1.88 MOA. Here the bore was really dirty, time for a cleaning.

Left: 79.5 grains, 0.88 MOA. Best group of the day, last load before getting into compressed loads. Also as much punishment as I can take in a day so that will be it for now.

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Overall I'm pretty satisfied. Maybe groups could improve slightly by using a lead sled. It's an MOA rifle with factory and hand loads, which for a .375 H&H seems pretty good. Since all the groups are about the same, I'll be loading at 79.5 grains for hunting. I'll chrono the load on my next trip to the range.

Questions or comments are welcome. Cheers!
 
Awesome work on the bedding! I also have a Sako 85 that I'm considering for a bedding job so seeing your step by step process is really helpful.

One question I have is about the floating recoil lug on these Sakos: some people say that removing the floating plate and installing a Tikka recoil lug into the base of the stock makes it easier to bed and stronger against because of the greater surface area contact than the small button from the plate; and the Sako 85 receiver still has the groove for a Tikka-style lug anyway (which they used in the past). Have you seen anyone do that yet? Or is there anything else you would improve about your process if you were bedding another Sako 85?
 
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