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#285379 07/16/12 10:59 PM
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I haven't had any response from Clearwater Reboring about my proposed job,and until I can find another shop, I thought I'd like to hear from any of you regarding what I need done. I have an excellent JP Sauer 9x57, but the throat is quite eroded. Accuracy seems to be about 3" gruops for five shots at 100 yds with jacketed bullets. Lead seems to shoot about the same for 3 or 4 shots and then spreads badly. Can this .356 bore be opened to .366? If the change has to be big enough to ream the existing rifling completely out, then I'd have to go to a .375.I want to save this barrel if at all possible. Any recommendations or suggestions?


Bill Ferguson
rocky mtn bill #285389 07/17/12 12:06 AM
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Last year I had a Winchester 64 in 30-30 re-bored to 38-55 by J&S. I chose the 3-groove and they did a fine job, could not be happier with the work or the turnaround time.

J&S


MP Sadly Deceased as of 2/17/2014




rocky mtn bill #285390 07/17/12 12:08 AM
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If it's just the throat that's causing the problem, could you try re-chambering to .35 Whelen if the action is long enough? Might clean up the throat area...

rocky mtn bill #285400 07/17/12 02:13 AM
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I also had a Martini sporter rebored by JES.
worn out 303 to 35 on the 303 case. Perfect job. He only needed the bbl.
Job completed in 2 1/2 weeks.
$225 to $250 depending on # rifling grooves.
Included opening the neck on existing chamber, throating & return shipping of bbl.


I too got tired of waiting & never hearing from Clearwater.

Call Jessie @ JES Reboring. Let it ring. He'll pick up, or the answering machine will. Leave a message for call back and he WILL call you back.
http://www.35caliber.com/index.html

He'll let you know what options are available with the existing bbl dimentions you have.

rocky mtn bill #285420 07/17/12 09:15 AM
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You might be able to just clean up the throat depending upon how bad that erosion is. A bit more freebore.
I have had that problem with a few rifles and I moved to the heaviest/longest slug that would stabilize. In a few of those cases it worked. A far less expensive/invasive approach.

If you do move to the Whelen, check the position of the shoulder on the 9mm first, it may leave a bump. Worst case, you have to turn the barrel back a thread to give you enough new metal to work with. Then again, if you can find someone with 9mm reamer, you can do the same thing and keep the chambering intact.

Tom


Carbonation without fermentation is tyranny
rocky mtn bill #285430 07/17/12 09:54 AM
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I've also considered fire lapping though it seems to affect the throat area more than the rest of the bore. I don't know at this point if accuracy is lost more to the roughness of the throat or to its being lenghtened by erosion. The bullets I fired were both 250 grs, seated as far out as possible. Setting the barrel back is complicated by the key through the forearm.and also by lettering around the barrel shank. Hmmm.


Bill Ferguson
rocky mtn bill #285431 07/17/12 10:04 AM
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If fire-lapping, use jacketed bullets fired at low, very low, velocities. The jacket and the low velocity will largely prevent the bullets from obturating/expanding into the throat area.

Check your groove size, it's probably too large for reboring to 9.3 but would probably be fine for .375 (9.5x57/375 Express).

Check the crown; a recrown may, just MAY, improve accuracy.
Regards, Joe


You can lead a man to logic but you can't make him think. NRA Life since 1976. God bless America!
rocky mtn bill #285451 07/17/12 12:44 PM
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JD, How do I go about choosing a powder and a charge? I'm inclined to try Trailboss but unsure where to begin. I may be asking a hazardous question. Maybe something like7-8 grs?

Last edited by rocky mtn bill; 07/17/12 01:03 PM.

Bill Ferguson
rocky mtn bill #285478 07/17/12 03:26 PM
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I've never used Trail Boss, am not familiar with its burning rate. IIWY I'd look in the back of a Lyman Handbook for cast-bullet loads for the 8x57, and use the Lyman CAST-BULLET starting loads for whatever powder you have in stock. You shouldn't need more than maybe 2 dozen in total, just be sure to clean the bore thoroughly after each successive grit size change.

Hope it helps but frankly IMO it'll probably need something besides fire-lapping. F/L works quite well on new barrels however.
Regards, Joe


You can lead a man to logic but you can't make him think. NRA Life since 1976. God bless America!
J.D.Steele #285494 07/17/12 04:28 PM
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I didn't realize the pile of issues due to contour, key, etc. What a drag. Using the 250s would have shown you if it at least had potential as well.
Calibers in the 35's tend to be fairly easy to hand lap, and could actually give you the opportunity to choke the bore as well. If the throat is hogged out, it may not make a difference. If the lead is worn, that would probably be better solved with a throater.
Did a little info check that showed the 9mm as having a .430 shoulder while the whelen had a .440. That should clean up the chamber correctly if you want to take the budgeted approach for getting it to shoot.

Tom


Carbonation without fermentation is tyranny
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