So just got a .308 built by GA Precision.
Specs to help
Bartlein 1-10 26"
ARC CDG
Area 419 Hellfire
using garmin xero to measure
Brand new lapua lrp brass
210M Primers(they are from 2010)
Varget
Berger 175 OTM
So gun was broken using GA Precision Instructions
Brass prep. Chaffer and debur. then neck size with no mandrel.
Measuring using RCBS charge master. then 10-10 with manual trickler to finish
42.9 es of 35.8 sd 13.4. 9 shots
42.4 es 45.7 sd 15 10 shots
43.5 es 48.5 sd 14 10 shots
All of that was with a 8 pound of varget from 2010
So I opened a brand new 1 pound of varget still sealed bought 2023
43 es 27.8 sd 8.3 10 shots
so I thought bingo I solved it
but for the heck of it my next 11 I used a stand alone .306 mandrel sinclair model on top of the same brass prep
Also I used a K+M Primer Pocket Uniformer on the next set of 100 Brass. Highly doubt that did anything
43 es 41.8 sd 14 11 shots
Im pulling my hair out. So gun has 111 rounds through it, so wondering if the barrel is still breaking in so to speak. Is it because its brand new brass and its fire forming slightly.
I just bought a Erik Cortina FL Micro Die with a .334 bushing. Loaded rounds at .337. I have 200 Pieces, once I have once fired them all I will start using my new die. I plan on selling the neck die.
Thanks for any help
Specs to help
Bartlein 1-10 26"
ARC CDG
Area 419 Hellfire
using garmin xero to measure
Brand new lapua lrp brass
210M Primers(they are from 2010)
Varget
Berger 175 OTM
So gun was broken using GA Precision Instructions
Brass prep. Chaffer and debur. then neck size with no mandrel.
Measuring using RCBS charge master. then 10-10 with manual trickler to finish
42.9 es of 35.8 sd 13.4. 9 shots
42.4 es 45.7 sd 15 10 shots
43.5 es 48.5 sd 14 10 shots
All of that was with a 8 pound of varget from 2010
So I opened a brand new 1 pound of varget still sealed bought 2023
43 es 27.8 sd 8.3 10 shots
so I thought bingo I solved it
but for the heck of it my next 11 I used a stand alone .306 mandrel sinclair model on top of the same brass prep
Also I used a K+M Primer Pocket Uniformer on the next set of 100 Brass. Highly doubt that did anything
43 es 41.8 sd 14 11 shots
Im pulling my hair out. So gun has 111 rounds through it, so wondering if the barrel is still breaking in so to speak. Is it because its brand new brass and its fire forming slightly.
I just bought a Erik Cortina FL Micro Die with a .334 bushing. Loaded rounds at .337. I have 200 Pieces, once I have once fired them all I will start using my new die. I plan on selling the neck die.
Thanks for any help
Last edited: