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Post by rangeball on Feb 25, 2009 16:42:34 GMT -5
I plan to slug my SMI barrel when it shows up. Pretty sure I understand how to do it, but was wondering how critical it is to use a lube or grease? I'd rather not, but if I don't will leading be an issue?
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Post by Harley on Feb 25, 2009 17:04:10 GMT -5
If your only question is whether or not to lube, don't. No issue with this one-time process.
Harley
P.S.: I got worried that I was wrong about lubing the slug, so I looked it up. I WAS wrong, you should lube. See my next post.
Harley
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Post by rangeball on Feb 25, 2009 17:10:42 GMT -5
Yes, it is. Thanks  |
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Post by Harley on Feb 25, 2009 18:11:24 GMT -5
I just found this post I did on the old Board: For those who aren't sure how to measure the inside dimensions of your barrel the following link is as good and simple as you could ask for. I'd never done it before, but it was easy. For the .45: I bought a 3/8"x36" oak dowel from Home Depot for $1.09. I bought a pack of 3/4 ounce lead egg sinkers from BassPro for $4.49. You will have to beat the heck out of the sinker to start it in the barrel and you do need a composite hammer to do it. A rubber mallet is too soft and a metal hammer is too dangerous to the muzzle of your rifle. I had an old inertia bullet puller that worked just fine. Any micrometer will measure the high points (the groove diameter), but I needed my blade micrometer to measure the indented grooves (the lands diameter). It's the lands diameter that counts. 62x54r.net/MosinID/MosinSlug.htmHarley |
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Post by Al on Feb 26, 2009 3:33:03 GMT -5
I plan to slug my SMI barrel when it shows up. Pretty sure I understand how to do it, but was wondering how critical it is to use a lube or grease? I'd rather not, but if I don't will leading be an issue? Range, check and make sure there is no burr on the lands or grooves of the BP end before you slug. |
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Post by rbinar on Feb 26, 2009 4:46:28 GMT -5
I plan to slug my SMI barrel when it shows up. Pretty sure I understand how to do it, but was wondering how critical it is to use a lube or grease? I'd rather not, but if I don't will leading be an issue? I have to ask: Is a good barrel not in the budget? Or do you have a barrel dimension you are interested to achieve? |
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Post by rangeball on Feb 26, 2009 9:47:29 GMT -5
Thanks Harley. Will do Al. Rb, It's a douglas barrel, don't know if that qualifies as a good barrel or not, but yes, funds are almost maxed on this project I'd like to know the actual bore diameter in case I ever want to mess with .50 sabotless. Thor bullets sell them bore spec specific, and I've heard the SMI bore is a bit larger than many, so maybe that will bring other .50 bullets into play with some knurling. Nonetheless, I figured it'd be a good piece of info to have in the back of my mind. |
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Post by rexxer on Feb 26, 2009 12:38:25 GMT -5
rangeball- Out of curiosity let us know what you ended up with!
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Post by rangeball on Feb 26, 2009 12:46:47 GMT -5
Will do |
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Post by Richard on Feb 26, 2009 14:19:34 GMT -5
Rangeball...........Why not buy a bar of Cerrosafe from Brownells. You just put a cotton plug or anything in your barrel. Run it in from the breech end to about one inch from the muzzle. You melt the cerrosafe (kind of like lead) in a large spoon or ladle over the stove flame, with a heat gun, benz-o-matic torch......it melts at 190* and pour it in the barrel. It cures is a minute or less. Just push it out, (it initially shrinks a bit) and then wait an hour and it will return to the original size. Then measure. It can be used to make chamber casts and lots of things. Maybe about $12 for the bar and can be used over and over.
Richard
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Post by rangeball on Feb 26, 2009 14:32:40 GMT -5
Richard, never hear of it until now Definitely worth looking into. Thanks Something I just thought of- This will only measure one section of the bore, right? Aren't most tolerances like +/- .002? What if one only measures a tight or loose spot with this method? It would seem that pushing the lead through the entire bore length would give you the tightest spec, which is what you would need to know for shooting sabotless, right? |
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Post by rrbou on Feb 26, 2009 14:45:07 GMT -5
pushing it all the way through will give you the smallest dia. It will do nothing for the max. But it would be nice to know the area around the seated bullet and the muzzle area.
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Post by Richard on Feb 26, 2009 15:12:22 GMT -5
Rangeball.........Yes, you would be correct in assuming that. However, think of this: suppose the tight spot is in say......in the middle of the barrel and the area near the muzzle and the area in the breech where the bullet will seat is looser??? What actual good will that measurement do? You start the bullet down the bore looser than you thought it would be........It then compresses at the tight spot, then loosens up when seated? You really have not accomplished anything? Your bullet is too loose on the powder to give reliable ignition. I personally do not think it means that much. You are going to size down a bullet and then knurl it until you get a firm fit at the muzzle. A veggie or wool wad will help insure ignition. For all intents and purposes, a caliper inserted in the muzzle is about all you actually need to get you in the ballpark! ;D Just my humble opinion!
Richard
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Post by rangeball on Feb 26, 2009 15:23:36 GMT -5
I am actually hoping to be able to skip sizing down and knurling up will be the only thing necessary, but we'll see. Checked out the cerrosafe, now up to $20 before shipping per bar. Being a cheap bast, er frugal person I'll probably try the calipers in the muzzle and breech end first |
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