Gunsmithing How much set-back for an Ack cham. from standard

[GasLight]

Looking to know how much a barrel needs to be set back in order to completely clean up the chamber with an ackley improved reamer?

Thanks

Dave

 

[Hogshooter]

Re: How much set-back for an Ack cham. from standard

My smith set both of my .223 Ack. back 1 turn (thread).

 

[Jkob60]

Re: How much set-back for an Ack cham. from standard

You really only need .004" unless you need to realign sights.

 

[WRM]

Re: How much set-back for an Ack cham. from standard

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Jim Kobe</div><div class="ubbcode-body">You really only need .004" unless you need to realign sights. </div></div>

Interesting. Isn't that also the amount of "short" that you figure if you're using regular HS Gage checking AI chamber?...

Thanks Jim,

Bill

 

[RBros]

Re: How much set-back for an Ack cham. from standard

I usually set them back 1 full turn. This generally cleans up the throat and neck. Sometimes 2 turns are needed if it is a factory chamber and the neck is larger than the new reamer. You end up with a step in the brass otherwise.