My 6arc build

[StoneHendge]

noticed some funky stuff on the shoulder of the brass my friend converted for me so im scraping those rounds , they need to be run back threw the arc die now that i know what the issue is

to start after running the gren brass into the arc die , it needed to be trimmed a good bit then run back into the arc die hard to move the shoulder back and size the neck properly.

my friend had only run the gren brass into the arc die as far as it would go which was not enough without being trimmed a second time , the brass my friend ran for me was trimed back to normal grendel trim lenght , what i noticed was after that first step the brass needed to be trimmed back to 1.490 ish and then hit int he arc die hard a second time , and then finally a small trim back to 1.475 , without the second step threw the arc die the necks are seriously way to tight


from left to right

left 3
nosler 70g balistic tip varminters over 30.5g of ppv should be around 3200 fps out of the 20 inch barrel oal 2.150

next 3 are 80g sierra spbt varminters over 31g of power pro 2000mr expected mv should be around 2750-2800fps oal 2.125 power pro varmint would get theese going a bunch faster but im conserving that powder for the lightwieght arc and heavy grendel bullets

last 4 are sierra 90g fmj gamekings over 30g expected mv in the 27/2750 fps range loaded ot an oal of 2.215 but theese wont chamber so ill have to seat theese deeper and that oal is tbdsame here power pro varmint would get theese going faster but saving that powder for other uses

edit knocked the 90's back to 2.150 and they now chamber

You've got A LOT of room to move the 70 gr NBTVs out. In my 6x45 they are at a max COAL of 2.31" and the base to Hornady datum line is 1.82"
For the Sierra 90s, I was 0.03" off the lands at a 2.27" COAL and a 1.865" base to datum line