7Mystic 10lbs 1000m BR Rifle Finished

Unfortunately, I know very little about websites and how to add stuff/modify the info. Was another CGN who graciously helped get it set up in trade for some M305 tuning.

Renos over the last year ensure I have no time to learn or play with my website.

But to answer your question, the process is very simple and applies to most wildcats where the shoulder is relocated.

You need to form a secondary shoulder. I designed the 7Mystic to work with 7RM dies cause I have a set and saw no point in spending a few hundred in making a custom set.

Using the FL sizing die, a '06 case is sized. The only part of the case that is touched is the neck. What comes out of the die is a case with a partially squished (sized down) neck. Voila, secondary shoulder. Chamber in the rifle to ensure that the bolt needs a firm push to close. This establishes a crush fit in the action to ensure min headspace and no stress on the case web.

For other wildcats like the Gibbs, etc, you just adjust a sizing die so the neck is moved to form the secondary shoulder. Sometimes you have to neck up before necking down. That just depends on what you use as your parent brass.

The case is now primed, a small amount of pistol powder added, the case is filled with dry, non instant cream of wheat/corn to the base of the neck, a piece of paper towel is pushed in firmly to hold everything in place.

Fire the case at the range. You have to treat it the same way as a case with a bullet because the cream of wheat is actually dangerous at very short distances.

What you extract will be a case with a newly located shoulder that is about 90% of the final shape. The next full pressure load with get you the nice sharp shoulder.

Prep the case as usual. I like to neck turn as the necks are thick and this just cleans things up. With the sharp shoulder, case trimming is usually zip especially if you use a collet (I use a 7RM collet die, almost zero runout)or bushing neck die.



Left to right: '06 case, necked down with false shoulder, COW fireformed, Amax seated, amax for comparison.

Hope that helps.

Jerry
 
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the mystic you talk about looks like a 280, or any other wild cat off the 30-06 case. I thuoght you didn't like those cases.good to see you have come to your right frame of mind. ps jerry I have my machine shop up and running again. little prob. with my back still .nice to see your still moven...

PATMAN
 
Patrick, glad to hear from you again. It has been quite a while. Nice to have your shop finished. Will have to come and have a look.

Never had any issues with the 06 family of cases. I have owned several rifles and built a few custom ones. don't you remember that the big deer I shot with you was with a 30-06?

The 7 Mystic just came about because of a barrel and Aubrey's shoot. Any idea when the next one is? Hope to do some load development and get it ready to play this year.

Any interest in the fun shoot I am putting on April 29th? Same place that we last shot at.

Splatter, the 6.5 Mystic was my idea to build a better 1000m/yd BR cartridge. The concept was to use a modified 308 case to reduce the amount of powder used to increase barrel life vs the 6.5-284. Also, the case would have 100% load density which would help reduce ES and stringing at long range.

The first rifle showed great results and hope to have some time this year to finish my second. This one will have 30" Gaillard and a barrel block. Will post results of course.

Here is a pic of the cartridge next to the parent 308 case. I did a lot of searching to see if anyone had made similar wildcat before. Came up with lots of AI's but nothing that relocated the shoulder.

I have maxed out the 308 case in every dimension I could and it still extract (a smidge of body taper) and hold a bullet. Kind of neat making a unique wildcat.

Short range shooting was fine in the prototype. Look forward to seeing what this second rifle will do at 1000m.

Jerry

 
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Jerry As For April29, No I'm Sorry I Can't Still Working The Next Project The Big Daddy, Shooting That Mule Buck At 608 Yrd Was Fun But There Is A New Hunting Season Comming Up. Need To Shoot Longer, Harder, Fast With 1/4 M.o.a..out There Call Me I'll Tell You About .as For My 280 Throwing A 168 Match King At 2900 F.p.s That Will Now Be The Close Combat Rifle. As For The Shoot With The White Man Down South,not Sure On When But I Here Your Closing In On My Smallest Group Size. It Will Be Hard To Top.
 
Splatter, the short Gibbs is the closest analogy. I think it is a nice looking case.

Pat, will have to chat on your cannon for sure. Always nice to see new toys.
Neck deep in renos so limited on time to shoot and build rifles. Hopefully, the house will be finished in the next month and I can focus on shooting for a change.

Jerry
 
Well, it seems this combo does shoot. Just won the Hunter Class (10lbs, 10x) at the Osoyoos 1000m fun shoot with a 27-1x. Hellacious winds as usual.

The 162gr Amax certainly bucks the wind well. Certainly better then I can dope.

Also, had lots of fun shooting this during the Summerland Fun day in April. Was gratifying to see Lionhill connect on a clay at 710yds on his first shot.

Well, that pretty much covers the development of this wildcat. I am very happy that it has turned out well and met all of my project goals.

Now onto other projects. If the next week or two of testing another rig shows promise, this rifle sans optics will be for sale.

Jerry
 
Congrats on your win Jerry.

Yes, the April shoot still stands out as a highlight of my (albeit brief) shooting experience. Hopefully with all this new reloading gear to create some (hopefully) more accurate ammo with.

LH
 
Since there has been more interest on how I modified the orig Savage stock, here are some pics during construction.

I cut away what I didn't want, rough up the surface really well, spray with brake cleaner to remove any oils, epoxy blocks of wood and plywood on. All that is left is shapping, sealing (I like thin epoxy), painting.

With the orig inletted section, you can build any stock you want. Just make sure that if cutting through the wrist section, you put in bolts or dowels to retain the strength.

Folding stocks, tactical or BR styles, anything is possible...

Jerry




 
If anyone is interested using this stock modification to stiffen their stock, make sure you extend the width and depth into the magazine area. Stopping it at the recoil lug in this fashion does next to nothing for increasing stiffness. The forend design; physically does improve resistance to rotation of the rifle due to its wide profile.

I should also mention, that with the ventilation style (removing material (at the top of the forend) by decreasing the depth) shown it is necessary to add material to the sides to increase stiffness of the forend across its length. It is an uphill battle. The greatest stress from bending is at the recoil lug area. An improvement would be to have the side panels run several inches past the recoil lug. The design shown only increases the stresses and degree of flex in the lug area when a dynamic load is applied such as upon firing..

In any case this is all in good fun.....
 
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