Gunsmithing Rechambering a barrel question.

[Lofty]

So I just got a brand new 6 Creedmoor reamer and I have a 243 that is basically brand new.

I would like to have it chambered in 6 CM instead since its supposed to be a little easier on.barrel life and I already have almost 700 pieces of Creedmoor brass.

What's involved.....do I lose any barrel length?

 

[bohem]

Re: Rechambering a barrel question.

The CM chamber is a few thousandths larger at the body/shoulder (0.004" if I remember right) than the 243 case is but the 243 neck is shorter, shoulder is longer, base to shoulder is longer, etc.

Exactly what is different and by how much is not something on the top of my mind but you will lose some barrel length, likely around 1/4" if the work is done with the utmost care and all goes smoothly.

When you say the 243 is "basically brand new" is it unfired, proof fired, 100 rds, 400rds?

 

[Lofty]

Re: Rechambering a barrel question.

It's been proof fired only. Probably 3-5 rounds. So the throat should be like new.

 

[dinc]

Re: Rechambering a barrel question.

Save your money. Shoot out the 243 barrel and rechamber the next one to CM. If you're handloading both you won't see any difference. Save the CM brass and buy some 243. You're throwing away money to pay for the rechambering.

 

[Lofty]

Re: Rechambering a barrel question.

Id thought about that but I can get the chamber done cheap.

That plus I wouldn't have to buy brass for the 6mm.....and arguably get better barrel life.

 

[2156SMK]

Re: Rechambering a barrel question.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Lofty</div><div class="ubbcode-body">Id thought about that but I can get the chamber done cheap.</div></div>

Define cheap...$30, $50?
I don't know that I want a barrel chambered by someone that only charges $50 to fit a barrel.

Buy 200 pieces of winchester 243 brass.
That will be enough to wear the barrel out.

You are only going to get maybe 300 rounds more barrel life from the 6 creedmore so that's about 20% of the cost of the barrel and fitting job.
Figuring $150 minimum for a set-back and rechamber, you need to get the work done for $30 in order for it to be cost efective.
Anything over $30 becomes non-cost-effective.

 

[Lofty]

Re: Rechambering a barrel question.

Hmmmmm....that makes sense.

Yeah, my smith would probably charge $150 or so. If the barrel life difference isn't any better than that, you're right.