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Post by bradshaw on Jan 25, 2024 6:22:33 GMT -5
John Parker is more than satisfied with at least one rebore job, as I recall a Miroku made, John Browning-designed Winchester Model 1885 falling block. David Bradshaw
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Post by bigbore5 on Jan 25, 2024 6:48:27 GMT -5
I've had a barrel rebored before. A 220 Swift to 264 Win mag. It was a Shilen bull barrel. But I'm not sure it's a fair comparison to a regular rebore as it was vibratory and cryo stress relieved by me after being torqued to the action. Both would shoot good, but the 264 would do 5/16ths to the 220's 1//2" with tailored loads.
I'm not sure who did the rebore, but Leonard Baity did the rifle both times.
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axman
.30 Stingray
Posts: 424
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Post by axman on Jan 25, 2024 8:35:56 GMT -5
A few months back I had a NEF 45-70 rifle rebored to 50-70. 3 groove rifling . 22" barrel. 465 LBT @ 50yds using a 4x Burris went into 9/16" for 3 shots. Forend held on a tightly rolled blanket. For reference the same load in a 14" SSK Contender ran 1100 FPS. I'd say all things being equal rebores work well.
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Post by hunter01 on Jan 25, 2024 8:55:12 GMT -5
The quality of the rebore will dictate all. JES has a stellar reputation and most people claim better accuracy after the rebore than before. If it’s a quality steel, a quality job, and lapping is involved, there is no reason a rebore couldn’t be as good as any other barrel including boutique.
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Post by revolvercranker on Jan 25, 2024 12:03:07 GMT -5
My main concern would be stress induced in the barrel in the process of reboring and rifling it. I'm sure the better producers would stress relieve them after finishing. I was told that hammer forging puts a lot more stress in the barrel then conventional rifling methods. Steyr claims they can stress relieve their barrels 100 %
In WW2 the U.S. had a machine that vertically drilled the barrel hole. From what I've heard they were exceptional barrels. This was for the Browning BAR rifle. I had actually WW2 veteran friends that were BAR men tell me that the bAR was very accurate.
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Post by bushog on Jan 25, 2024 19:41:42 GMT -5
Weren’t talking about rifle barrel rebores….different animal than a revolver rebore.
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Post by bigbore5 on Jan 25, 2024 20:16:37 GMT -5
Reamed and rifled by a competent machinist and properly stress relieved, it absolutely would not surprise me to see accuracy improve with the rebore. I Had an 8-3/8" Smith 27 that shot patterns. Recut the cone and crown, then lapped the barrel. Improved,but still not there.
Next was cryo stress relief bath. 2" at 25yds. 16hrs on the vibratory stress relief table netted 1-3/4".
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Post by kevshell on Jan 27, 2024 9:47:31 GMT -5
I spoke to Ben Forkin about this concept related to Winchester 70s. He and I were discussing how some of the rifles wouldn't group now matter what was done (the usual route). He said casting the chamber showed many of them had crooked chambers and needed to be rechambered which got them on paper or got them within hunting accuracy. He explained some of the chambers you'd see lands on one side of the casting and it would be gouged out on the other side. It wasn't a guaranteed fix for the maligned barrel but likely.
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axman
.30 Stingray
Posts: 424
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Post by axman on Jan 27, 2024 10:12:22 GMT -5
It's a belief that rebored and Cut rifled barrels get rid of stress that was induced from profiling,button rifling, and the like. My best guess is that it would help no matter the barrel length all things being equal. You'd have to get JES or Dan Petersen on the phone to be sure.
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Post by bushog on Jan 27, 2024 12:35:40 GMT -5
I wish somebody would start doing .501./.512 again….
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Post by revolvercranker on Jan 27, 2024 14:26:35 GMT -5
It's a belief that rebored and Cut rifled barrels get rid of stress that was induced from profiling,button rifling, and the like. My best guess is that it would help no matter the barrel length all things being equal. You'd have to get JES or Dan Petersen on the phone to be sure. l any kind of metal work you do to a barrel induces stress into it. Hammer forging rifling induces a lot. Just turning the profile of a barrel on a lathe induces stress into it. You guys know this. I'm not saying that reboring a barrel ruins or helps it's accuracy. Am I for reboring? Absolutely. This arises a question, what are your opinions on relining a bore??
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Post by marcruger on Jan 28, 2024 20:53:33 GMT -5
"In WW2 the U.S. had a machine that vertically drilled the barrel hole. From what I've heard they were exceptional barrels. This was for the Browning BAR rifle. I had actually WW2 veteran friends that were BAR men tell me that the bAR was very accurate."
From what I understand, one of these WWII machines is still in use, at Shiloh Sharps in Montana. I believe it is a four-at-one-time deep drilling machine by Pratt & Whitney. Still doing's its job after many years.
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Post by marcruger on Jan 28, 2024 21:00:16 GMT -5
In the world of muzzleloading barrels, the issue of straightness, precision rifling and run-out are ongoing topics. These are long barrels (38" to 44" for example) that are often thin and whippy compared to handgun barrels. Though many barrel makers claim their barrels have zero run-out, it can sometimes be an issue. Run-out should be oriented vertically so that it is possible to have the sights reasonably centered on a barrel. Also, swamped barrels (fat at the breech, thin in the middle, flaring back out at the muzzle) can get unintentionally bent is the barrel is a lightweight profile and it suffers abuse. Reboring can result in a fine barrel, depending on the dedication and skill of the person reboring and re-rifling. Just some thoughts.
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Post by revolvercranker on Jan 28, 2024 22:00:58 GMT -5
"In WW2 the U.S. had a machine that vertically drilled the barrel hole. From what I've heard they were exceptional barrels. This was for the Browning BAR rifle. I had actually WW2 veteran friends that were BAR men tell me that the bAR was very accurate." From what I understand, one of these WWII machines is still in use, at Shiloh Sharps in Montana. I believe it is a four-at-one-time deep drilling machine by Pratt & Whitney. Still doing's its job after many years. I will find out and send a text to my friend. I know the one the U.S. Armory used was six at one time.
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Post by rjm52 on Feb 20, 2024 8:57:15 GMT -5
Have three rebores: S&W 27-2 .357 to .41 Magnum S&W 53 .22 Jet to .327 Federal Uberti Cattleman .357 to .41 Special
...all three are just as accurate as the other custom and bone stock guns I own in those calibers.
A friend has had a number of rifles rebored to .358 Winchester...zero issues with accuracy with any of them...
A bad barrel is a bad barrel regardless of where it came from...
Bob
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