Twin Cities Carry Forum Archive

.40 caliber bullet a necked down .45 case
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Author:  special_k [ Wed Aug 05, 2009 11:09 pm ]
Post subject:  .40 caliber bullet a necked down .45 case

Is there such a thing as a .40 caliber bullet in a necked down .45 case a la .357 sig? I think it would be pretty cool!

Author:  chunkstyle [ Thu Aug 06, 2009 1:49 am ]
Post subject:  Re: .40 caliber bullet a necked down .45 case

.400 Cor-Bon.

Author:  nframe [ Thu Aug 13, 2009 11:17 pm ]
Post subject:  Re: .40 caliber bullet a necked down .45 case

I fooled around with 400 cor-bon a few years back. Got 1500 fps
with a 155 grain fmj. 5" bbl in a 1911, Primers showed high pressure signs and it was not accurate, something like 4" groups at 25 yards. If you enjoy muzzle blast and flame it wont let you down.I still have the barrel,dies,some brass,and bullets just sitting there.

Author:  Seismic Sam [ Fri Aug 28, 2009 12:14 pm ]
Post subject:  Re: .40 caliber bullet a necked down .45 case

Kind of a dead end, considering the existence of the 10mm, which is far better suited to launching 40 caliber bullets to those velocities. The 400 Corbon also has an achille's heel, which is its very short neck. You have to have ABSOLUTE control over your neck tension during reloading, and if a bullet gets pushed back into the case during feeding it's just like having that happen with a 40 S&W in a Glock. You get a very nasty KABOOM. Talked to a guy who was doing load development for it, and he had one, and said it was nasty. 45ACP cases are not really meant for high pressures at all. You could get around that with 45 Super brass, but why bother when you can 1500 in a 10mm with a 155 grain bullet with no chance of bullet setback?

Author:  nframe [ Sun Aug 30, 2009 5:30 pm ]
Post subject:  Re: .40 caliber bullet a necked down .45 case

Sorry about the gap in my reply.The bullet set back on feeding can be cured but it still does not fix the cartridge. I have a corbin (no relation to cor bon) canelure tool. It lets you roll a crimping groove (or canelure) into a bullet.That enables a good crimp to hold the bullet. I also found some cases that were thicker at the mouth. Most 45acp brass is .0105 to .011 at the mouth I had some odd headstamp stuff that was .012 so I used that. That did not help the primers that looked like chefs hats,or the thunder from the very large charge of Blue Dot. Don't bother with it.

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