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Posted: 4/16/2014 3:46:31 PM EDT
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I have a Mosin Nagant 90/31 and a Tokarev pistol I want to start loading for, but I need to know what size bullets these two guns need...so I need to slug them.
Everywhere I see instructions for slugging a barrel, they seem to say "start at the muzzle and pound the slug toward the chamber." Why? It seems like it would be easier on both the barrel and the person doing the work to start at the chamber and go toward the muzzle. Can someone either tell me why everyone says to go from the muzzle, or tell me "it doesn't matter"? Thanks! |
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I've only slugged one new blank made by John Buhmiller. I drove it from the muzzle about two inches, then drove it back out the muzzle. Wrong or right, it's .459"
From the breech forward makes sense. Until you think of erossion. I'd sooner do this than pound a slug through the muzzle. Crowns have fallen for less |
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I slugged a 9mm bore recently. I wanted the muzzle to be the last bore seen by the slug. I dropped a lead bullet in from the chamber end and tapped it in with a light weight (tack) hammer. When it got near the muzzle, I held onto the barrel and rod and tapped the rod the rest of the way by hitting the rod on the bench top (like stabbing the bench). The bullet popped out of the muzzle.
BTW, I found no loose spots in the bore. |
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Ive done it on a mosin with a fishing sinker. Found one close in size and smashed it slightly with a hammer until it was slightly larger than the bore. Greased it and the muzzle and used a brass rod to drive it through. Oak dowel would be better but I had none. Loose spots for sure but its a good shooter at 100yrds. 2moa with handloads. It does however open up substantially to 200 for some reason. I know 2 moa should be 2 moa but this gun defies it...
Fwiw.... my bore is .312 1934 91/30 |
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The reason you start at the muzzle stated back in the day andcan be still relevant toda.y.
Barrels were hand forged and rifleing was always started at the breech pulled to the muzzle. This had slight runout by some gunsmiths. Also if you are slugging an older barrel here could be erosion which is more likely to accumulate at the muzzle. Pushing a slug from the widest point to the smallest will keep the slug more accurate. Pushing a slug from the smallest to the widest will allow the slug to compress and expand to fit the larger part of the bore. |
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Quoted:
The reason you start at the muzzle stated back in the day andcan be still relevant toda.y. Barrels were hand forged and rifleing was always started at the breech pulled to the muzzle. This had slight runout by some gunsmiths. Also if you are slugging an older barrel here could be erosion which is more likely to accumulate at the muzzle. Pushing a slug from the widest point to the smallest will keep the slug more accurate. Pushing a slug from the smallest to the widest will allow the slug to compress and expand to fit the larger part of the bore. The barrel gets eroded at the throat not the muzzle. Pushing it from the chamber end, the bullet get the benefit of the lead into the barrel, just as when it's fired. The last thing the bullet contacts is the rifling at the muzzle, also just as when fired. I did not want to start pounding a bullet into my muzzle. The muzzle is too important to accurate shooting. Well, that's how I see it. |
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Quoted:
The barrel gets eroded at the throat not the muzzle. Pushing it from the chamber end, the bullet get the benefit of the lead into the barrel, just as when it's fired. The last thing the bullet contacts is the rifling at the muzzle, also just as when fired. I did not want to start pounding a bullet into my muzzle. The muzzle is too important to accurate shooting. Well, that's how I see it. Quoted:
Quoted:
The reason you start at the muzzle stated back in the day andcan be still relevant toda.y. Barrels were hand forged and rifleing was always started at the breech pulled to the muzzle. This had slight runout by some gunsmiths. Also if you are slugging an older barrel here could be erosion which is more likely to accumulate at the muzzle. Pushing a slug from the widest point to the smallest will keep the slug more accurate. Pushing a slug from the smallest to the widest will allow the slug to compress and expand to fit the larger part of the bore. The barrel gets eroded at the throat not the muzzle. Pushing it from the chamber end, the bullet get the benefit of the lead into the barrel, just as when it's fired. The last thing the bullet contacts is the rifling at the muzzle, also just as when fired. I did not want to start pounding a bullet into my muzzle. The muzzle is too important to accurate shooting. Well, that's how I see it. I think you're right on the throat erosion. I mat have the runout part backwords. 
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Quoted:
You really should slug it 3 times. Muzzle, Breach and one all the way through.  True; there is frequently a slight constriction at the breech threads, and muzzles DO erode from things like improper cleaning. Some barrel makers also leave the muzzle just slightly smaller in diameter than the rest of the bore. |
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