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10MM

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Reply with quote  #1 
Let me first say i am no expert reloader.  Anyone who attempts this does so at their own risk.  That being said, i have had very good luck with the process.  In the pictures posted i will be using a rcbs single stage press and lee dies.  I have quite a bit of 7.62x39 winchester brass so i decided to convert it for use in my 6.5 sporter upper.   First you should install the shell holder in your press.   Lift a it a bit then install, pretty self explanitory.

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10MM

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Reply with quote  #2 
Then set the shell holder all the way up and install your sizer/deprimer until it firmly meets the shell holder and tighten the lock nut.  My chamber likes it fairly tight.  Lubricate the brass and run your 7.62 through the stroke then test fit it to your chamber.  If it extracts properly then you should be good to go. If it sticks in the chamber you need to snug the die up a bit against your shell holder. I do a few more rounds and test fit to be sure.

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10MM

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Reply with quote  #3 
Reloading process goes as normal except the tapered walls will decrease capacity.  Go a few grains less than you would normally for grendel brass.  Id did 26 grains of 8208 under 100 grain nosler.  And 25 grains of 8208 under 123 amax. Take it to the range and shoot it.  This will fire form the brass to your chamber and you now have full (or close to it) grendel brass.  I checked all mine over well for signs of over pressue.  I did have 3 that looked like the case started to split or split just slightly.  Since it was used brass and i had no knowledge of how used i wasnt surprised much by this. The cracks were hair line and had no effect on the way it functioned nor was it noticeable while shooting.  If you flatten primers and or keep splitting cases obviously stop shooting it and decrease the load.

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10MM

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Reply with quote  #4 
Be sure to check your overall length adjust with the knob in the above post.

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10MM

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Reply with quote  #5 
Photos show the brass before sizing, then after sizing, the picture with 3 has the final fireformed product.

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10MM

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Reply with quote  #6 
Not bad groups for fireforming brass and sighting in a $99.00 scope. These were 100 grain nosler over 26g of 8208. I expect to dial it in much better than this once i get a decent scope and work up some loads.

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Borrego Bob

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Reply with quote  #7 
Thanks for sharing this!!
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mddavis561

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Reply with quote  #8 
Anybody have any idea about neck thickness and pressure because of that?

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Borrego Bob

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Reply with quote  #9 

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Borrego Bob

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Reply with quote  #10 
COuld i not just buy a bunch of 7.62X39 load them with lighter fireforming loads and store for SHTF scenarios? Do they cycle fine?
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“What’s the secret of success? Right decisions. How do you make right decisions? Experience. How do you get experience? Wrong decisions.” – John Wayne

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10MM

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Reply with quote  #11 
They cycle fine out of my 10 round mag with blue follower and my 20 round mag with white follower. They also shoot pretty decent in my experience.
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turbodiesel598

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Reply with quote  #12 
I was never really able to get them to cycle in my auto. I bet with 7.62x39 AR mags they would though.
Biggest issue I had with converted brass is that the shoulder isn't bumped far enough back, and the AR bolt wouldn't always go into battery. I didn't want to mess with adjusting the die for 2 different sizings(pre fire form vs normal full length), so I just leave the dies set for sizing already formed brass and simply fire form with my bolt gun. I can close the bolt easier on it than I can with the AR.
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