The Accurate Reloading Forums THE ACCURATE RELOADING.COM FORUMS Guns, Politics, Gunsmithing & Reloading Gunsmithing Opening up a bolt face...Go | New | Find | Notify | Tools | Reply | |
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Maybe a stupid question for the gunsmiths on this Forum, but how is a boltface opened up to accept a larger head diameter than for which it was originally machined? I am wondering how it's done, what with the bolt handle hanging out and spinnin' 'round like it must? | ||
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There's at least two ways to do it. I use a LaBounty bolt jig that clamps the bolt and mounts in my 4-jaw chuck. Another way is to use a steady rest. Sorry I don't have pictues of either one. John Farner If you haven't, please join the NRA! | |||
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Here's how I do it: Put it in a box and mail it to Toomany Tools. In a couple weeks it comes back modified perfectly..... It works very well. /////////////////////////////////////////////////////////////////////////// "Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy, its inherent virtue is the equal sharing of misery." Winston Churchill | |||
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I start by placing an adapter in the rear of the bolt and truing it to the body.  Then, I place the adapter in the 4 jaw and run the bolt head in the steady rest.  Then, I bring the boring bar into position to square and open the face.  _______________________________________________________________________________ This is my rifle, there are many like it but this one is mine. My rifle is my best friend, it is my life. | |||
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Would it be asking too much to open a .700 bolt (machined for .535 WSM) such that it could support the .580 head diameter of a 338 Lapua Magnum? Is there enough metal there? | |||
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It would leave you with about .050 material surrounding the case head which is sufficient for case support. You will have to install a custom extractor. If it were my personal project I would consider either the 338 RUM, or, the Edge. The Edge is less work, cheaper to feed and from what I've been able to see and hear based on experience from friends and customers who shoot both, identical or slightly better performance than the Lapua. _______________________________________________________________________________ This is my rifle, there are many like it but this one is mine. My rifle is my best friend, it is my life. | |||
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Don't know what action or what bolt face you trying to modify...but Midway is offering a carbide cutter for popular case heads. You apparently put the bolt in the action, screw an adapter in the receiver threads, acts as a pilot for the cutter. Haven't tried it, since I don't really need yet another special tool, but might be worthwhile looking into | |||
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The set up works great, I still prefer to use a lathe like malm explained. I have used the cutter only in the lathe with np problems either. No measuring once it is running true. Kind of a no brainer. Great for people like me. You can get them right from Dave Kiff for a little cheaper last I checked. Don | |||
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A minor challenge with using a Remnigton 700 for the large magnum case is that they often will not eject a live round. A 338 Lupua with a 250-300 grn bullet and all that powder is sometine just too much for the ejector to throw the cartridge clear. Not really a big deal but some folks finds it annoying. 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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Don Markey...I like no brainers, may look into it! Thanks Duane | |||
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Excuse me, but aren't those tools just for truing the boltface, not opening it up? I'm not familiar with them other than the ads on Brownells and Midway's websites. John Farner If you haven't, please join the NRA! | |||
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Hello John: The Tooling Block and Boltface Burrs originated as part of our Accurizing System and have been knocked-off by several people. The Burrs CAN be used to open the bolt recess to a larger diameter, but any extractor must be removed before this is attempted. When using this method to open the bolt recess, the cutter must be cleaned of chips frequently. Because of its fine teeth, it'll fill with steel and not cut any more or, in extreme cases, chip. Hope this helps. Best regards, Dave Manson | |||
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I have opened up a 98 Mauser for 300 Win Mag, and that is straight forward. To open a 91/30 to 45/70, I ground a tool that would reach in there and face and cut a very small radius on the inside. | |||
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Dave, Thanks for the explanation. Seems like a great way to go for those with limited access to machine tools, and I'm certain it's a quality made tool like all the other you make. John Farner If you haven't, please join the NRA! | |||
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