Seat Depth for Break in barrel

[gsg5pk]

Hi,



What is the proper seat depth for break in a barrel?

My new ftr rifle chamber spec .342nk , .150fb , 1-30

This rifle was new and never fired. I check the COAL with Hornady and got Berger 185 LRBT will touch land at COAL 2.860"



So, what COAL should I load for break in?
How long of throat that will longer after break in?

 

[watercam]

Can't go wrong jumping .020" to break in and get started. Load development from jammed to jumped even more will tell the tale.

 

[amlevin]

Can't go wrong jumping .020" to break in and get started. Load development from jammed to jumped even more will tell the tale.

Why jump when starting break in? Why not just start with a middle of the road powder charge and jam?

Use some of the break in rounds for load workup. At least eliminate loads that have zero potential.

 

[gsg5pk]

Thanks

 

[CatShooter]

Why jump when starting break in?

Why "break-in".

Just work up your loads, and if you believe in break-in, it will happen all by itself, and if you don't, whatever happens, will happen.

 

[artbosco]

To break in a barrel, clean it, shoot 10 rounds, clean it, shoot 15 more. Clean it. You're Done. Jumping, Just Touching, or Jammed, it doesn't matter. You're not fireforming brass.

Gale McMillan of McMillan Stocks has said Just Shoot'em, the more a person shoots to break in a barrel the faster barrels are worn out and the more barrels are sold by barrel makers. Breaking in a barrel is really not needed, according to him: http://www.6mmbr.com/gailmcmbreakin.html

 

[amlevin]

Why jump when starting break in?

Why "break-in".

Just work up your loads, and if you believe in break-in, it will happen all by itself, and if you don't, whatever happens, will happen.

That's kind of what I did with my last new barrel. Since the rifle is more "tactical" than BR I always like to start with a magazine length round and work from there.

 

[cdparker]

Here is a thought. If you have never fired any brass in the gun, use a jam with the bullets. That way you get a case that is formed to your chamber. If you want to really "pick nits", when you fire a case in your chamber, there is a slight movement of the case forward from the strike of the firing pin. The case moves forward and expands to obdurate in it's forward position. So now you have formed a case that actually has the shoulder set back a wee. You take your case measuring tool and measure that case and set your sizing die so that you get a couple of thousandths set back the next time it is loaded. There is a chance that you will inadvertently create excessive headspace in your loading procedure.
Remember, this is just a thought.
Craig