Glass Bedding ?

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graaf7mm

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Ok so i guess I'm gull of questions, but i guess i could be full of worse things right :) . I formentioned the new Sendaro i just bought, it's a .300 Win Mag. A late friend of my Dad's who i always considered and authority on reloading and everything in this realm said bigger rifles like this one should have the actions glass bedded.. Any thoughts on that? if the gun shoots moa as is will glass bedding, or rather, can glass bedding cut the groups in half. Or if it shoots that well should i just leave it alone? Before i bought the rifle i figured a muzzle brake would be mandatory but after shooting it today I really to my surprise don't need one. Would it have any effect on accuracy?
thanks in advance for all your input, this is a great community
 
i'm of the mind that bedding rarely hurts but if your happy with the accuracy leave as is. most of mine are bedded but i have amountain rifle in 280ai that i have never bedded cause it shoots too well to mess with. as for the brake i don't think it affects accuracy but my 280 shoots better with the brake on than off. the load was tuned with the brake on so its probably a non issue.
 
Hi, welcome.

I've got a Sendero in 300 RUM that I can't get to shoot. The best I've been able to manage is right around MOA and I expect better than that.

Anyway, my research has revealed that inspite of the nice HS Precision stock with the aluminum bedding block, some Senderos do much better after a 'skim bedding job'.

I've bedded mine and it turned out great. I'm just waiting for a chance to shoot and see if it made a difference.

I'll be sure to post with the results.
 
Gents - You have to realize that once you get down to MOA performance, the limitation is likely the operator, not the rifle. It takes a substantial amount of skill to go below MOA. Suggest you leave both of your Sendero's alone - they are working as they should...
 
Well that was helpful...

cosmic said:
Gents - You have to realize that once you get down to MOA performance, the limitation is likely the operator, not the rifle. It takes a substantial amount of skill to go below MOA. Suggest you leave both of your Sendero's alone - they are working as they should...
Click to expand...

Thanks for the Wisdom cosmic.

It just so happens that I'm very aware of what size groups I'm able to shoot. I have more than one rifle dude.

Maybe 1moa is the best you can do, no need to project that limitation onto others who's experience or abilities you have no knowledge of.
 
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TwoTone - Glad to hear that your an expert - your original post does not portray that. We await your results with baited breath....
Perhaps the original poster can benefit from both your and my posts - I believe he is a newbie. FWIW - I do manage to shoot sub MOA, even before the internet arrived. I do this with rifles that I glass bed myself, and reload for myself - and I dont need to spend a G note on a Sendero to do it.
I'm flattered to be called a dude - I'm a middle-aged professional engineer.
 
Bedding

Bedding never hurts a rifle unless it's done incorrectly. I would do it if it were me. I've done most of mine myself. Don't expect the groups to be cut in half. If you are consistent your groups MAY shrink by 1/4"-3/8" and if your really lucky 1/2". That would give you a very accurate sub MOA gun.

As for the muzzle brake, they usually do not affect accuracy, instead they may shift your zero. That said you will find it easier to shoot with your muzzle brake and that just may help you shoot even smaller groups. Muzzle brakes can be installed for $250-$350 including return shipping. Look for a source in your area.
 
Like others have alluded to, even if you can shoot .250" groups with your 223 it doesn't mean that you will be able to with your magnum caliber rifle even if the rifle is capable of it. I know that we are all the manliest of men on here but it can be hard to impossible for some to overcome the magnum stigma when we shoot.
That said it can't hurt anything to give it a skim bedding job.
 
Results:

TwoTone said:
Hi, welcome.

I've got a Sendero in 300 RUM that I can't get to shoot......I'll be sure to post with the results.
Click to expand...

Having skim bedded the rifle I tried it again with my best load so far.

The results: group size unchanged - 1.1 to 1.5 MOA. Curiously, the groups were all pretty much shaped like the number 7.

Today, I tried again with the same load and a different scope. I took off the Leupold Vari-X III 4.5 - 14 that I bought new when I bought the rifle (2007) and I installed a Bushnell Scopechief 3 -9 that I've had for years and works well on my 30-06.

I then shot the three smallest groups to date with this rifle and all the groups were nice and round. Smallest was .5 MOA, largest was .7 MOA. Some tuning can likely improve this a bit.

I think there may be a problem with the Leupold scope or the way it was mounted, although everything seemed ok while I was removing it.

I'm now going to remount the Leupold and try again with the same load to confirm.

FYI the load is:

300 Remington Ultramag
96.7gn RL 22
165 Nos Accubond
WLRM primer
Rem brass.
Avg. velocity = 3605 fps.

This is a hot but safe load in this rifle. 97.4 gn (.7 grains more) of RL 22 showed slight ejector marks. This load does not exhibit high pressure signs but is close to that. Please don't try to use this load without working up.

I'm really planning to use heavier bullets in this rifle but I was using this load because it is the best one to date. I've gotten the 200gn Accubond up to 3250 fps using US 869, but groups were still only about 1.2 MOA. That may change once this scope issue is cleared up.

So, back to the original intent of this thread:

Bedding my Sendero doesn't seem to have made a noticeable difference. That being said, I'm still glad I did it. One less thing to worry about.
 
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I switched back to the Leupold and now it shoots sub MOA with that too. Although I couldn't see anything wrong when I took it off, maybe there was a problem with how it was mounted previously.

Another possibility is that I decided not to clean the rifle before shooting with the Bushnell and still didn't clean when I went back to the Leupold. Maybe the barrel needs many fouling shots before things tighten up. I've cleaned it now so we'll see what happens.
 
Done a trigger job yet?
"...97.4 gn..." 20.7 grains over max for a 165 grain bullet with RL22, according to Alliant. 18.4 over max according to Nosler. That load is unsafe.
 
Sunray,

Yes, trigger breaks nicely at 2 pounds.

In my first post on this thread, I stated that mine is a 300 RUM, not a Winmag. I guess I should have stated that again when I posted the load. I've edited it to show that now.

That load of 96.7gn RL22 is 3.7gn (4%) over the load on the Alliant Loading Guide for 165gn bullets.

The load is 6.7gn (7%) over the max. listed in the Nosler #6 manual for 165/168gn bullets.

As stated before hot but perfectly safe in my rifle.

I don't think that load would even fit in a 300 Win Mag case but if it did I would agree with you that it would be a one shot deal!
 
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TwoTone said:
FYI the load is:

96.7gn RL 22
165 Nos Accubond
WLRM primer
Rem brass.
Avg. velocity = 3605 fps.

This is a hot but safe load in this rifle. 97.4 gn (.7 grains more) of RL 22 showed slight ejector marks. This load does not exhibit high pressure signs but is close to that. Please don't try to use this load without working up.
Click to expand...

I punched those numbers into quickload, and it estimates a chamber pressure of over 70000 psi. Whats your cartridge overall length ?
 
I'm not trying to claim your wrong about the pressure signs you've observed, we're all adults here and you can judge for yourself if your load is safe or not ....I'm just passing along what quickload came up with for your load.

Here's a screenshot: click to enlarge-



Cheers :cheers:
 
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