Bullets flat vs cupped base
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someone1980
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Post subject: Bullets flat vs cupped base Posted: Thu Mar 29, 2007 7:50 am |
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Joined: Mon Mar 13, 2006 11:19 pm Posts: 2305
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I wonder if there is a reason why one would want a pistol bullet with a cupped base vs a flat base?
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Selurcspi
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Post subject: Re: Bullets flat vs cupped base Posted: Thu Mar 29, 2007 8:01 am |
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Longtime Regular |
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Joined: Fri Feb 24, 2006 1:02 pm Posts: 1569 Location: The Mild, Mild, West, Burbs
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_________________ NRA Certified Instructor MADFI Certified Instructor MN DNR Certified Instructor UT BCI Certified Conceal/Carry Instructor
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Pinnacle
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Post subject: Posted: Thu Mar 29, 2007 8:27 am |
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Designated waste of protoplasm |
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Joined: Fri Feb 24, 2006 4:41 pm Posts: 1807 Location: Western Burbs of MPLS
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There is nearly nothing more potentially ferocious than a .38 DEWC loaded BACKWARDS
Hollow base bullets are nice - they make a good gas seal - they are cheaper to manufacture
Flat base bullets are just fine as long as there is a slight taper to the jacket to ease loading and not to collapse cases.
Flat base bullets are normally (sometimes) a feature of a JHP but is not always the case. Sometimes there is exposed lead at the base - but not always.
Hornady - Sierra - Nosler use a flat base (copper base enclosed) on their pistol JHP's (winchester offers some with an exposed lead base - RA9TA)
They can handle a lot higher velocity without leading the bbl - or deforming.
Cupped bullets are fine and are a feature of lead - and sometimes FMJ's exposed lead at the base - this exposed cupped area does not necessarily make for a better gas seal - but I suppose that there is a chance of it... Anyhow....
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mmcnx2
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Post subject: Just a thought Posted: Thu Mar 29, 2007 9:22 am |
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Joined: Thu Jun 29, 2006 1:52 pm Posts: 211 Location: Greenfield, MN
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I assume your talking about either lead or exposed base bullets. Both can have concave surfaces.
One thing to consider with these is your leading in the barrel will be higher than with jacketed bullets that have closed base.
Just food for thought.
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someone1980
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Post subject: Re: Just a thought Posted: Thu Mar 29, 2007 12:39 pm |
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Joined: Mon Mar 13, 2006 11:19 pm Posts: 2305
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mmcnx2 wrote: One thing to consider with these is your leading in the barrel will be higher than with jacketed bullets that have closed base.
Closed base is where there is copper over the base also?
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mmcnx2
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Post subject: Yup Posted: Mon Apr 02, 2007 1:40 pm |
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Joined: Thu Jun 29, 2006 1:52 pm Posts: 211 Location: Greenfield, MN
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Yes, a closed base has copper on the bottom of the bullet, there are a nmber of companis that make Jacked hollow points this way but finding a fully jacket bullet with the base covered can be a littel harder.
If forved to choose I'd take the JHP with a closed base over a FMJ with a exposed lead base. Just due to the leading.
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mobocracy
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Post subject: Re: Yup Posted: Mon Apr 02, 2007 2:29 pm |
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Forum Moderator |
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Joined: Thu Aug 11, 2005 6:55 pm Posts: 986
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mmcnx2 wrote: Yes, a closed base has copper on the bottom of the bullet, there are a nmber of companis that make Jacked hollow points this way but finding a fully jacket bullet with the base covered can be a littel harder.
If forved to choose I'd take the JHP with a closed base over a FMJ with a exposed lead base. Just due to the leading.
All of the JHPs I've seen have the base jacketed. This is true of JSPs I've used with revolvers.
I always assumed it was because they were created with the same technique used for FMJs, but the die used for forming them formed the hollowpoint rather than the exposed base.
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