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22 ARC dimension issues in AR 15

Trnelson

Trnelson

Well-Known Member
Joined
Feb 15, 2012
Messages
829
Location
Nebraska
22ARC 77g TMK in newly resized and trimmed Starline brass. At resizing I'm measuring 0.426-0.427" at the shoulder, these chamber and extract 100%. After seating the bullet I'm seeing 35-40% of the cases measure 0.427+-0.429" so they mostly chamber but are difficult to extract, with the others still holding around 0.427+/". After a Lee FCD operation just kissing the case with zero cam over nearly all of those are 0.428+-0.430" with a hit or miss chambering and a very difficult extraction of a non-fired case.
My thought is maybe lube the bullet at seating and back off the FCD or eliminate it? I also tried loading a few into 6.5 Grendel and haven't seen anything out of the ordinary. Am I barking up the right tree gents?
 
Dmagna said:
No, sounds like you have a seating problem. Either crushing with the seating die or your neck tensing is so high you are crushing. What brass are you using?
Click to expand...
New Starline 6.5 Grendel sized down and then trimmed to 1.520". That seems to be the case that it's collapsing the shoulder at bullet seating and a bit more at crimping.
 
have to turn the starline 6.5 Grendel to .2495 on a loaded round for the .254 chamber neck, the brass is just too thick for the 22ARC. the shoulder is .431 so your .427-.430 should not be a problem.
turn brass, aggressive chamfer, and graphite in neck before seating should eliminate the problem.
 
Last edited:
can1010 said:
have to turn the starling 6.5 Grendel to .2495 on a loaded round for the .254 chamber neck, the brass is just too thick for the 22ARC. the shoulder is .431 so your .427-.430 should not be a problem.
turn brass, aggressive chamfer, and graphite in neck before seating should eliminate the problem.
Click to expand...
Yep. Im starting to compare the arithmetic
 
can1010 said:
have to turn the starline 6.5 Grendel to .2495 on a loaded round for the .254 chamber neck, the brass is just too thick for the 22ARC. the shoulder is .431 so your .427-.430 should not be a problem.
turn brass, aggressive chamfer, and graphite in neck before seating should eliminate the problem.
Click to expand...
I resize Starline 6.5G to 22 ARC and have not had to neck turn anything. Feeds and ejects well in my Faxon barrel.
 
Mike D Texas said:
I resize Starline 6.5G to 22 ARC and have not had to neck turn anything. Feeds and ejects well in my Faxon barrel.
Click to expand...
different barrel, chamber, and lot of brass. chamber neck .254, sized and loaded .2535 avg. most tight chambering but definitely no clearance for expansion when fired.
you more than likely have a looser chamber, that's good it saves a step.
 
Dmagna said:
Yeah. Sounds like you might need to turn. I wouldn't do it yet, but maybe find a different brass that works. I hate turning brass
Click to expand...
Me too! It's like watching paint dry, concrete set, and mud puddles dry up on a job site.
I went with only Hornady cases for my 6.5 Grendel and Starline for the 22ARC so as to be able to readily identify them in the wild with certainty.
 

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