| Posted: Sun Nov 23rd, 2008 12:57 AM |
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| Joined: | Sat Nov 22nd, 2008 |
| Location: | Virginia Beach |
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Greetings from the new guy in VA Beach! I have enjoyed reviewing the threads and have picked up a few nice tidbits. I can tell there's a lot of experience here. I thought I might possibly get some answers to a few nagging question.
I have loeaded thousands of 9mm Luger, and I am stating on other calibers. In shopping for jacketed and lead bullets, I am weary of not understanding what difference .001" in bullet diameter makes in my finished cartridges. There's .355, .356, .357, and .400, .401, .402, and .451, .452, etc. Have I just been lucky all this time? Does it depend on the particular barrell I'm shooting? Do I have adjust the crimp? Does it vary from manufacturing anyway? Is there a difference between lead and FMJ ? Speaking of that, what's the differnce between FMJ, TMJ, and CMJ ?
Hopefully, these are obvious quiestions, and others are curious too. I thank you for any input you might have.
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| Posted: Sun Nov 23rd, 2008 04:00 PM |
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runfiverun
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| Joined: | Sat Feb 9th, 2008 |
| Location: | Soda Springs, Idaho USA |
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fmj= full metal jacket .tmj = total metal jacket ,the difference is the base a fmj is usually exposed lead. and cmj = copper mj, as the others can be cupro-nickel steel,or copper.
now as far as the bullet diameter making a difference. it does: your 9mm bbl may be 357 or 8 inside diameter and not truly 355. now this is where it might get confusing, if your bbl is truly 355 and you wanna shoot a cast boolit through it you will want to use one that is 356 or possibly 357 if it will chamber .
but if you are shooting jacketed and your bbl is say 357 your 355 bullets will probably do fine.
now if you are shooting cast again and your chamber is cut for a bullet size that will only allow you to use a 355 sized boolit and your bbl is 357 [this is easily possible] you will have mucho leading and horrible accuracy. 
now that you are really messed up we will move on.
the 45 acp is supposed to have a 451 diam bbl i shoot 452 sized cast in mine. the new 45 colts bbl.s are 452 diameter i still shoot 452 in them just fine. but i have measured my cylinder throats and bbl's and know 452 will shoot fine. however in my 45 colt ruger i shoot 454 sized boolits because of the cyl. throats and forcing cone.
hope this helps.
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| Posted: Sun Nov 23rd, 2008 08:33 PM |
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steel13
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| Joined: | Fri Dec 21st, 2007 |
| Location: | I Live In The Rain, Washington USA |
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Typical rule of thumb is, you want your lead Boollit sized .001 over your actual slugged barrel size.If you've never slugged your barrel, these are a guestement. 356 for 9mm, 358 for 357and 38 spec. 452 for 45ACP. You can shoot under sized, but may find that the accuracy is not there.
Miestro Jerry and weezengeezer are more of experts than I. I would solicit their help, and take it as gospel.
Good Luck, Justin
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| Posted: Sun Nov 23rd, 2008 08:50 PM |
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miestro_jerry
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You need to do a casting of chamber and measure it if you want an accurate idea of what size your pistol takes, but my rule of thumb for new weapons is .001 over when you are sizing a cast bullet.
I have an old Spanish FR8 in 308 Win, that I size the cast bullets to .311 and the rifle does have a worn bore. But shoots well for the condition it's in.
Jerry
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| Posted: Mon Nov 24th, 2008 11:58 PM |
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72coupe
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My father brought home a Nazi Browning Hipower from WW2 that I used to shoot a lot, jackrabbits mostly. I loaded 357 Sierra revolver hollowpoints in it and they shot great. But the bore on it looked like the inside of a cave.
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| Posted: Tue Nov 25th, 2008 12:13 AM |
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miestro_jerry
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72,
Most the WW II weapons that I have handled over the years, the bores are pretty well eroded away. So I would shoot as cast or over sized bullets in those weapons.
Jerry
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| Posted: Wed Nov 26th, 2008 12:58 AM |
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| Joined: | Sat Nov 22nd, 2008 |
| Location: | Virginia Beach |
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AAHH! A little information can go a long way. So, there is a difference between lead (cast) and FMJ. The cast should be a little snug in my barrel (which I will measure). Too snug will cause excessive leading. These tidbits should allow me to produce more accurate ammo for my '92 Belgian made HiPower (and the new calibers). I'll continue to watch for other posts.
Thanks to all for lighting the way, and to Runfive for both enlightening and confusing (all good, bro!).
Rob
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