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Forum Index > Rifles general discussion > Rebarreling my Zastava

Rebarreling my Zastava

19 Feb 2022
@ 01:34 pm (GMT)

Rob Bird

I'm working on rebarreling and otherwise revamping my Zastava M70 originally chambered in 30-06. I had wanted to do a 6.5-06 AI but I was able to get a prechambered barrel in 6.5x55 from Lothar Walther. So I removed the old barrel and am in the process of refinishing the stock, rust-bluing all of the metal, and then will fit the barrel and ream out to 6.5x55 AI.

As I'm sure many know, normally you would just finish reaming the last 50 thousands or so with the standard reamer. Given that the walls of the AI have less taper and the shoulder is farther forward, I figure I should be able to do AI instead of standard. Is there any flaw to my thinking?

Replies

1
22 Feb 2022
@ 09:45 am (GMT)

Nathan Foster

Re: Rebarreling my Zastava
Hi Rob, sounds fine, go ahead as planned.
23 Feb 2022
@ 10:51 am (GMT)

Rob Bird

Re: Rebarreling my Zastava
Thanks!
23 Feb 2022
@ 11:51 pm (GMT)

Rob Bird

Re: Rebarreling my Zastava
I didn't mention that I am planning on hand-reaming this. On another forum, someone said that this is a risky proposition, even on a lathe, and that the pilot of the reamer will not reach the bore before the wider shoulder of the new reamer starts to cut the existing standard chamber, making it impossible to keep it centered.
24 Feb 2022
@ 06:50 am (GMT)

Nathan Foster

Re: Rebarreling my Zastava
Hi Rob, sorry I have also been thinking about this. Such an idiot sometimes. The change to the chamber is not just at the shoulder, but the body is also made wider and therefore you will not get the pilot to engage. But there is more to this, the throat geometry may differ (and the neck), resulting in a step at the throat.

You could still make this an AI provided the barrel has some parallel at the tenon, but the barrel would need to be set back.
24 Feb 2022
@ 02:50 pm (GMT)

Rob Bird

Re: Rebarreling my Zastava
What do you mean "has some parallel at the tenon"?

For what it's worth (which may not be much), I introduced the 30-06 AI FM reamer into the old Zastava barrel that is in 30-06 and the pilot definitely reached the bore.
24 Feb 2022
@ 04:12 pm (GMT)

Martin Taylor

Re: Rebarreling my Zastava
The section of barrel (external) meets the action Rob, this area is the Tenon.

Nathan is saying that there needs to be enough parallel to cut into setting back the shoulder where it meets the action to give new material to chamber into.
25 Feb 2022
@ 01:31 am (GMT)

Rob Bird

Re: Rebarreling my Zastava
I know what the tenon is, just am not sure what "parallel at the tenon" refers to exactly. The part of the tenon that's parallel to...the bore? It's a new barrel, so is there a way it wouldn't have enough of it?
25 Feb 2022
@ 07:12 am (GMT)

Magnus Vassbotn

Re: Rebarreling my Zastava
Hi.

I believe he means a long enough knox/ cylindrical section to work with when setting the barrel back.

Magnus
25 Feb 2022
@ 08:38 am (GMT)

Rob Bird

Re: Rebarreling my Zastava
Ah, ok. Thank you.
05 Mar 2022
@ 10:10 am (GMT)

Nathan Foster

Re: Rebarreling my Zastava
Hi guys, I managed to talk to Rob on the phone. Rob will probably go ahead a give the AI reaming a try. He knows what the consequences might be so is under no illusion. Fingers crossed it all works out.
06 Mar 2022
@ 03:41 am (GMT)

Rob Bird

Re: Rebarreling my Zastava
I'll keep you posted. Someone on another forum had recommended asking PTG to custom grind a longer nose on a reamer. I asked them about this via email and seemingly the person responding doesn't understand me or I'm missing something about their replies. He first referred me to the page for their 6.5x55 Arch Ackley Improved reamer, though it had no print posted. After another exchange, he finally sent me a print of their standard 6.5x55 AI reamer and the print shows nothing about the nose, that I can see.

Am I the one that's not being clear? Part of my last reply is, "I'm referring to how far the pilot is ahead of any cutting surface. I'm wondering if you can grind a reamer with an extra long nose, that is, with the pilot farther ahead of a cutting surface than a normal reamer."

Is this clear? Do I need to phrase it another way?
06 Mar 2022
@ 06:46 am (GMT)

Nathan Foster

Re: Rebarreling my Zastava
It was probably clear under ordinary conditions but the industry (people) is / are under a terrible strain at the moment so all coms need to be crystal clear and concise, spelled out in the most simplistic terms.
08 Mar 2022
@ 03:17 pm (GMT)

Rob Bird

Re: Rebarreling my Zastava
Good point, thanks for that.
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