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I have a re barreling job in the shop and was wondering how you guys machine the extractor clearance on the breach face. This is more complicated than a typical Winchester 70 or small ring Mauser extractor slot as the extractor rotates with the bolt. Any ideas would be appreciated as I'm stumped. | ||
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I have done this exactly twice, so for what it's worth.... I attached an angle plate to the bed of a vertical mill and then attached a rotary table to the angle plate. I could then suspend the barrel muzzle down through the rotary table. I used an end mill to cut the breech cut, turning the rotary table by hand to get the cut made. I had to move the head of my mill out to reach the barrel breech as well. I won't take on any more of these jobs! Bill Jacobs NRA Endowment Member US Army Veteran CWP Holder Gunsmith | |||
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Done many of them; no fancy set up; use a Woodruff cutter, two setups in a plain vise. If you look at some 91 and 91-30 barrels there are more than one configuration of cut. | |||
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Did one and it was a pain. Can you show a picture or sketch of your setup? | |||
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Not a pain at all; just look at an original and copy that. Next time I do one I will take a picture. | |||
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DPCD knows of what he speaks. These groups are of different bullets and loads of a Mosin he re-chambered and modified the bolt face to 9,3x62 Mike Legistine actu quod scripsi? Never under estimate the internet community's ability to reply to your post with their personal rant about their tangentially related, single occurrence issue. What I have learned on AR, since 2001: 1. The proper answer to: Where is the best place in town to get a steak dinner? is…You should go to Mel's Diner and get the fried chicken. 2. Big game animals can tell the difference between .015 of an inch in diameter, 15 grains of bullet weight, and 150 fps. 3. There is a difference in the performance of two identical projectiles launched at the same velocity if they came from different cartridges. 4. While a double rifle is the perfect DGR, every 375HH bolt gun needs to be modified to carry at least 5 down. 5. While a floor plate and detachable box magazine both use a mechanical latch, only the floor plate latch is reliable. Disregard the fact that every modern military rifle uses a detachable box magazine. 6. The Remington 700 is unreliable regardless of the fact it is the basis of the USMC M40 sniper rifle for 40+ years with no changes to the receiver or extractor and is the choice of more military and law enforcement sniper units than any other rifle. 7. PF actions are not suitable for a DGR and it is irrelevant that the M1, M14, M16, & AK47 which were designed for hunting men that can shoot back are all PF actions. 8. 95 deg F in Africa is different than 95 deg F in TX or CA and that is why you must worry about ammunition temperature in Africa (even though most safaris take place in winter) but not in TX or in CA. 9. The size of a ding in a gun's finish doesn't matter, what matters is whether it’s a safe ding or not. 10. 1 in a row is a trend, 2 in a row is statistically significant, and 3 in a row is an irrefutable fact. 11. Never buy a WSM or RCM cartridge for a safari rifle or your go to rifle in the USA because if they lose your ammo you can't find replacement ammo but don't worry 280 Rem, 338-06, 35 Whelen, and all Weatherby cartridges abound in Africa and back country stores. 12. A well hit animal can run 75 yds. in the open and suddenly drop with no initial blood trail, but the one I shot from 200 yds. away that ran 10 yds. and disappeared into a thicket and was not found was lost because the bullet penciled thru. I am 100% certain of this even though I have no physical evidence. 13. A 300 Win Mag is a 500 yard elk cartridge but a 308 Win is not a 300 yard elk cartridge even though the same bullet is travelling at the same velocity at those respective distances. | |||
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Thanks, for your comments gentlemen. I have a rotary table but it does not have a through hole so that is out. My index head will not pass the barrel through it so that is out. I take it that just cutting the slot multiple times as you turn the barrel a couple of times works? I'll try that on a practice piece. | |||
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Turn it once, using a Woodruff cutter. You need to look at an original; there are two steps in it and the second one is the one that is radiuses; hence the use of the woodruff cutter, or ball end mill works too. Lots of ways to skin a cat. Not that I have ever skinned one. You realize that there are two types of Mosin receivers; in 43 or so they eliminated the inner shoulder like Mausers have. Not germane here though. Look at those groups; MD fired them from a 91 Mosin that I made into a 9.3x62; took a lot of mods to the bolt face, magazine, and receiver. But it shoots fairly well, I'd say even if I didn't make it. | |||
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