Author Topic: .45 ACP length issue  (Read 2360 times)

Offline TooMuchGlass

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.45 ACP length issue
« on: June 25, 2013, 04:10:46 PM »
I recently loaded 50 rounds of .45 ACP, and I have a technical question.

 The Lee reloading manual says .45 ACP should be 1.275 inches. Well, some of mine are as short as 1.265 inches. I know less room equals greater pressure; is this dangerous?

The load is 3.9 grains of Ramshot Competition powder pushing a 200 grain round nose lead bullet, which is the starting load published by Ramshot.

Thanks all!

Offline Bradbn4

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Re: .45 ACP length issue
« Reply #1 on: June 25, 2013, 08:42:57 PM »
Basic reloading data from power mfg site is

Competition 200 LC SWC 3.9 806 4.3 896 20,040 1.267

download it free here
http://www.ramshot.com/wp-content/uploads/2010/09/ramshot_handgun_rifle.pdf

That load / OAL should be good - you are not pushing top in speed - I would reduce the normal load to maybe 3.8 to make it a softer shooting load.  But 3.9 is fine load to start with.

Look at the brass after shooting it and check for pressure signs.

Also not all 200 swc designs are the same - so I don't think you should have an issue.  I figure a heavy crimp / roll crimp would add more to overall pressure than a .01" too small.

Offline TooMuchGlass

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Re: .45 ACP length issue
« Reply #2 on: June 26, 2013, 05:24:19 AM »
Ok that makes sense. I didn't put a crimp on it at all.

Offline Mortblanc

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Re: .45 ACP length issue
« Reply #3 on: June 26, 2013, 09:45:19 AM »
.010" is nothing to worry about and will not cause you pressure problems with that light load.

From one bullet nose shape to another you will always have a bit more or a bit less slug intrusion into the case and the MFG realizes that when printing the data. 

There is also the situation of having the slug setback in the case when cycled due to your failure to crimp, which will cause more problems than the ten-thousandths or an inch you are now concerned about.  And you will set the slugs back as they feed even if you do not realize it.  That is the reason taper crimp dies were developed.

OAL is of most importance for proper feeding through the magazine with longer than OAL giving feed problems. 

Offline TiredOldGrunt

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Re: .45 ACP length issue
« Reply #4 on: December 06, 2014, 03:07:39 PM »
My OAL is typically 1.26 with 230 plated ball and 6.4gn of Power Pistol.  No problems in my Sig.

EB