6mm arc barrel

Hecouldgoalltheway

Well-Known Member
LRH Team Member
Joined
Aug 30, 2020
Messages
497
Location
Tennessee
Ok folks, I'm building a 6mm arc on an ar15 platform. It is decided, not debatable. My intention is to maximize the efficacy of the cartridge. Does anyone have any ideas on barrel length and m.v., and twist rate? Also, barrel manufacturer recommendations would be appreciated. Thank you
 

Avonac

New Member
Joined
Nov 16, 2013
Messages
4
Location
Florida
I built an 18” upper with a stainless proof barrel. It has shot very well with factory Hornady. I left a little mv on the table, but it is suppressed and I appreciate the weight savings. If I built another, it would be 16”.
 

Hecouldgoalltheway

Well-Known Member
LRH Team Member
Joined
Aug 30, 2020
Messages
497
Location
Tennessee
I built an 18” upper with a stainless proof barrel. It has shot very well with factory Hornady. I left a little mv on the table, but it is suppressed and I appreciate the weight savings. If I built another, it would be 16”.
What sort of m.v. are you getting out of that 18" barrel? Thank you for your reply
 

Hecouldgoalltheway

Well-Known Member
LRH Team Member
Joined
Aug 30, 2020
Messages
497
Location
Tennessee
I forgot that I made this post, but I finished assembling it, went with a 22" er shaw barrel and at 46°, I was averging 2,690fps. I cannot believe how accurate it is. My groups from the first shots during zeroing have all been under an inch. I'm getting groups from .5 to .9, and I'm definitely not the best shooter on this forum, so who knows what it is capable of in better hands, and that is all with factory ammo..
 

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alyef

Member
Joined
Jan 29, 2014
Messages
19
Location
Raleigh, NC
I forgot that I made this post, but I finished assembling it, went with a 22" er shaw barrel and at 46°, I was averging 2,690fps. I cannot believe how accurate it is. My groups from the first shots during zeroing have all been under an inch. I'm getting groups from .5 to .9, and I'm definitely not the best shooter on this forum, so who knows what it is capable of in better hands, and that is all with factory ammo..
What was your break in procedure? I also ordered a Shaw.
 

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