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Post by mathias on Oct 16, 2018 12:23:42 GMT -5
Hello good folks A budy of mine just bought one and so far its precision has been mediokre to say the least. We have tried Magtech 158gr, 5 round group 140mm at 80m, some of mine handloads that shoots just fine in my S&W 586, 170gr Sierra tournament master fmj, Remington 180 hp, thet shoot a little better but not much  If there are some of you that have this rifle and similar problems what did you do to get it to shoot ? What expectations should we have regarding precision ? The gun is brand new, less then 200 rounds through it (could that be the problem ?) Best regards Mathias |
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Post by bradshaw on Oct 16, 2018 17:53:05 GMT -5
'The gun is brand new, less then 200 rounds through it (could that be the problem ?"
Best regards
Mathias
*****
Mathias.... break-in is not the problem,. If it is possible to do a chamber case with Cerrosafe, available from Brownells, you may have an answer. Among things which kill rifle accuracy:
* abrupt LEADE (transition from chamber throat to lands)
* bore waviness
* oversize groove diameter
* horrendous bedding
David Bradshaw
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Post by mathias on Oct 17, 2018 10:36:09 GMT -5
Thanks  We will have a look at those points and slug the barrel /Mathias |
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Post by ezekiel38 on Oct 17, 2018 23:21:25 GMT -5
I have a 77/357 and it shoots ok but no target gun. I've read that accuracy can be tightened by shimming the two piece bolt. Google it. Mines a short range minute of black bruin carbine with an aperture rear sight and a Williams firesight front.
My gun shoots ok with 170 bullets but it's not a "match grade" rifle, just a handy carbine.
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Post by bradshaw on Oct 18, 2018 6:19:49 GMT -5
I have a 77/357 and it shoots ok but no target gun. I've read that accuracy can be tightened by shimming the two piece bolt. Google it. Mines a short range minute of black bruin carbine with an aperture rear sight and a Williams firesight front. My gun shoots ok with 170 bullets but it's not a "match grade" rifle, just a handy carbine. ***** Since the .357 Magnum is a cartridge of high intrinsic accuracy, I would check groove diameter and for bore waviness, along with prior mentioned leade. David Bradshaw |
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Post by ezekiel38 on Oct 18, 2018 21:26:50 GMT -5
Thanks David, I will do that.
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Post by mathias on Oct 19, 2018 10:17:21 GMT -5
So we had us a good look at the gun yesterday and here are what we come up with:
Slugged the barrel after cleaning it first with Sweets and then JB bore paste and even if it is not the smoothest barrel i have seen there was nothing that had me worried. There was no hang ups when i pushed the slug through it, it measured 9,09 (.3578 if my converting is correct)
We did not have any Cerrosafe so we made a chamber cast using candlewax, made a mess of my kitchen flor in the process;) but it came out good enough for us to se that there is a angle there and after doing some math with the help of internet we came to the conclusion that the lead is about 7 deg. Does that sound right for what it should be ? And would it be worth it to redo the lead ?
We are now looking to shim the bolt and se if that will help
Any and all thoughts are most welcome
Mathias
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