I have had need to do this when chopping a barrel. Or just fixing a worn muzzle. Sometimes todays guns have issues here. My friends new S&W 10 mm is an example.
https://youtu.be/VPCTJDhaQKs
Hope ya enjoy.
CW
I have had need to do this when chopping a barrel. Or just fixing a worn muzzle. Sometimes todays guns have issues here. My friends new S&W 10 mm is an example.
https://youtu.be/VPCTJDhaQKs
Hope ya enjoy.
CW
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Posted on the thread for Bubba barrel repairs in the muzzleloading thread is a barrel I recrowned and the tool I made out of a ball bearing.
I do have the hand tools I bought 20 years ago from Brownells also.
I have the 90° cutter.
The 11° cutter as well as the 45° cutter.
Plus plenty of pilots to fit the bore.
But I mostly use that ball bearing to polish out the crown inside the bore.
And I bought a 45° lapping tool from Brownells and an outside crown cutter from them too.
I use to do a ton of barrels for Sporters and custom rifles.
Last edited by LAGS; 05-18-2022 at 03:32 PM.
I don't use NOTHING on a muzzle unless it is PILOTED. Everything else is guesswork. I'll pass.
All the ball bearings, brass balls, carriage bolts, all they do is make a home where there is the least resistance. No guarantee of concentricity whatsoever.
My crown cutter is a 20 degree Neway valve seat cutter for small engines with carbide blades. I use a Manson double expanding mandrel that centers on the lands and the cutter is sleeved and honed to concentric and it slides down over the mandrel and is turned with a drill motor or by hand, the newly cut crown is then polished with a piece of 180 grit cloth backed abrasive held against a 20 degree aluminum lap that centers on the mandrel, and finally shined with fine scotchbrite held against the lap.
Last edited by DougGuy; 05-18-2022 at 06:18 PM.
Got a .22 .30 .32 .357 .38 .40 .41 .44 .45 .480 or .500 S&W cylinder that needs throats honed? 9mm, 10mm/40S&W, 45 ACP pistol barrel that won't "plunk" your handloads? 480 Ruger or 475 Linebaugh cylinder that needs the "step" reamed to 6° 30min chamfer? Click here to send me a PM You can also find me on Facebook Click Here.
Wow! Great video! Thank you for posting this! One problem I have always had...cutting anything square with a hacksaw, and filing square, too,, even with a large "Dratsab" file.
I did manage to pass my High School Machine shop class, tho.
But...I did go to Home Depot and bought some round-headed brass bolts in various sizes,"just in case", and I bought the McARBO lapping tool when I got the spring and polish kit for my GP 100. So far, none of my crowns have needed any attention, which may be a Good Thing!. But...If it ain't broke, give it here for a minute!
IT IS A FINE AND PLEASANT MADNESS !
Your very welcome guys!! CW
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I had a guy who is a national champion benchrest shooter thread, install, chamber, and crown a barrel for me about 15 years ago. I asked how he crowned the barrel, he replied that he did it in the lathe. I asked if crowning using a round headed brass screw would work. He said that he had won national championships doing it both ways. I was surprised at his answer.
Yes sir ebb!! It aint rocket science!! ♥️♥️
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Good video. I've done 3 .22LR bbls using round head brass screws and valve grinding compound. All bbls turned out to be extremely accurate.
I would go along with DougGuy. I do rifles and the only way to cut a crown is in a lathe, indicated in to as small as possi ble with your setup, then pull the cuts from the bore to the outside.
NRA Life member • REMEMBER, FREEDOM IS NOT FREE its being paid for in BLOOD.
Come visit my RUMBLE & uTube page's !!
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THanx for posting the video, Sir.
Most edifying to a "mechano-dilettante" such as myself. I'm still at the "makes up for lack of skill with caution and determination" level of (non)proficiency, and the clip you posted helped clear up much confusion.
I HAVE used the "glass marble + fine grit abrasive in heavy grease" method, not to CREATE a crown, but to de-burr an obviously "burred" crown. I'm not sure I followed all the "holy rules of gunsmithing" in the process, but the old bolt action returned from "minute of grapefruit" to "inside a shot glass" at ~100 yards.
I harbor no illusions about my "making" the rifle more accurate. It was a tack-driver before the muzzle burring. All that I did was remove some obstacles untimely inflicted on an otherwise fine piece of ordnance. It felt good to change it (back) for the better, though.
Mercifully, I have wrecked no firearms, up to this point. May it ever be thus.
For in much wisdom is much grief: and he that increaseth knowledge increaseth sorrow. Ecclesiastes 1:18
He that troubleth his own house shall inherit the wind: and the fool become servant to the wise of heart. Proverbs 11:29
...Verily I say unto you, Inasmuch as ye have done it unto one of the least of my brethren, ye have done it unto me. Matthew 25:40
Carpe SCOTCH!
THanx for posting the video, Sir.
Most edifying to a "mechano-dilettante" such as myself. I'm still at the "makes up for lack of skill with caution and determination" level of (non)proficiency, and the clip you posted helped clear up much confusion.
I HAVE used the "glass marble + fine grit abrasive in heavy grease" method, not to CREATE a crown, but to de-burr an obviously "burred" crown. I'm not sure I followed all the "holy rules of gunsmithing" in the process, but the old bolt action returned from "minute of grapefruit" to "inside a shot glass" at ~100 yards.
I harbor no illusions about my "making" the rifle more accurate. It was a tack-driver before the muzzle burring. All that I did was remove some obstacles untimely inflicted on an otherwise fine piece of ordnance. It felt good to change it (back) for the better, though.
Mercifully, I have wrecked no firearms, up to this point. May it ever be thus.
Yer SINGING my SONG, friend. More often than not, I make that dude on "Home Improvement" look like a friggin' mechanical GENIUS! I sometimes wonder if my business card shouldn't read: "Bowling balls and Anvils wrecked while you wait."Wow! Great video! Thank you for posting this! One problem I have always had...cutting anything square with a hacksaw, and filing square, too,, even with a large "Dratsab" file.
For in much wisdom is much grief: and he that increaseth knowledge increaseth sorrow. Ecclesiastes 1:18
He that troubleth his own house shall inherit the wind: and the fool become servant to the wise of heart. Proverbs 11:29
...Verily I say unto you, Inasmuch as ye have done it unto one of the least of my brethren, ye have done it unto me. Matthew 25:40
Carpe SCOTCH!
i had a guy locally put a Shilen on my 25-06 and i got a contoured blank from midway. He installed it to its maximum lenght and it was just too long and i didn't have any soft cases it would fit in. i was very unsure that i could get it straight enough to crown so I bought the Brownell's tool. It cleaned up my hack saw work and made it very square but it looked rough so the brass screw came out again. I totaly get doing it in the lathe if it is such you can get in a lathe without a bunch of work.
It could more esthetic than actual. https://rifleshooter.com/2018/03/do-...fect-accuracy/
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