204 Ruger Proof CF barrel tested

Nice rig! I have an AR in 204 that Dan Carey built for me a number of years ago that shoots way better than I can.

The only problem I have had is it wanting bend shells trying to load sometimes. Every builder I have talked to says it’s because the 204 is a straight wall cartridge. Using the right magazines and followers seems to have pretty much taken care of it though.

What was the Vel.fps on that factory box 36 grain ?? ,out that 20" 10-1 .
Factory box ammo is pretty good Vel. and MOA grouping. I did a breakin and some test groups on a new proof CF 20" 10-1 .204 few weeks back for guy I hunt dogs with . He only wanted to run factory box, and the Hornady Super Performance 40 grain was cooking at 3700+ Vel. , and the Nosler 40 grn. was pretty respectable at 3590+ vel on the Garmin . I remember that proof .204 barrel bore also cleaning-up slick smooth and easy fast .
@100 yard. The factory Hornady Super Performance 40grn. was just holding 1 moa groups, with some smaller ones . Nosler box ammo was little slower Vel. but the 20" proof did favor it more with showing tighter in group sizes .
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Yeah Pmags don’t work at all for me. The only ones I have been able too get to work for me are Cproducts