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Reading manson prints... dumb question 7-6.5 PRC

LVLAaron

LVLAaron

Gold $$ Contributor
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Working on building a 7-6.5 based on 6.5 PRC. Manson had this print to work off of.


Is the "base dia .5345" dimension, the dimension at the 200 line, or the base? JGS prints show both a base and a .200 line number..
 
I have never been a fan of overly tight FB on larger cases. Carbon can and will build up. Barrels are not always on size leading to very shallow lands coming back to the neck. That's assuming you have a perfectly concentric chamber with no reamer wear and with a reamer that is not undersize. And the bottom line is it doesn't hurt accuracy but can add variables. I designed the reamers for USSOCOM for the new sniper rifle. I put in larger FB diameters for obvious reasons. Lack of maintenance mainly. There was an uproar as it went against conventional wisdom. The accuracy barrels I did for ammo development averaged 1/2MOA at 1K yards. Nuff said.
 
DaveTooley said:
I have never been a fan of overly tight FB on larger cases. Carbon can and will build up. Barrels are not always on size leading to very shallow lands coming back to the neck. That's assuming you have a perfectly concentric chamber with no reamer wear and with a reamer that is not undersize. And the bottom line is it doesn't hurt accuracy but can add variables. I designed the reamers for USSOCOM for the new sniper rifle. I put in larger FB diameters for obvious reasons. Lack of maintenance mainly. There was an uproar as it went against conventional wisdom. The accuracy barrels I did for ammo development averaged 1/2MOA at 1K yards. Nuff said.
Click to expand...

Come on Dave, you and I both know that no one that shoots our favorite discipline--the one you designed the MBR for--is happy with 1/2 MOA groups at 1k........unless we are talking 10-shot groups. And all rifles spoken of on the internet have to be LRBR accurate at 1k...................

:cool:
 
INTJ said:
Come on Dave, you and I both know that no one that shoots our favorite discipline--the one you designed the MBR for--is happy with 1/2 MOA groups at 1k........unless we are talking 10-shot groups. And all rifles spoken of on the internet have to be LRBR accurate at 1k...................

:cool:
Click to expand...
They were 10 shot groups in the testing. As one gentleman said. "It didn't hurt anything"
 
in today's world of fatter bullet diameter, a little wider FB diameter is a wise move
 
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