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45acp case length clarification
 Moderated by: Timberghozt, Rockydog, fryboy
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 Posted: Fri Apr 1st, 2011 02:33 AM
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doctordoctor
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Just wanted some clarification about the case length when reloading my 45 acp. I use Lyman products and manual #49. It says trim to length is .888" then on the diagram it shows from end to end brass = .898" why the difference?

So my next question is when I check my once fired brass it measures. 889" okay no biggie HOWEVER when I run the brass through my resizing/deprimer die the length then measures at. 892-.893" is this okay? Just a bit confused why my measurements are changing and different. Thanks

:confused:



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 Posted: Fri Apr 1st, 2011 02:44 AM
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fryboy
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trim to is usually >.010 less than max , in this case max is .898 and trim to is .888 , the 45 acp often shrinks and unless the lengths vary i rarely trim , some of this will of course depend upon how hot one loads but most pistols such as the 9 and 45 rarely need trimmed ( but it's better to check and trim when too long )



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 Posted: Fri Apr 1st, 2011 12:38 PM
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TMan51
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Doc, that range is where you can get reliable feed and function. The .45 headspaces on the mouth of the case.  Too much shorter and you start to run out of firing pin to reach the primer that is too far forward, too much longer, and you are running the case mouth into the barrel, and potentially raising pressures on ignition.

If you are ambitious enough to trim .45's, I'd use the middle of the range.  It takes a lot of shooting to stretch one out of spec with most loads and dies.



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 Posted: Fri Apr 1st, 2011 11:38 PM
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OldStuffer
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I've never had a .45 case stretch, not in 14 years or so of shooting it.

Thus, I've never trimmed one.

I have some cases that measure in the .870" range, they are shrinking, not stretching.



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 Posted: Sat Apr 2nd, 2011 02:00 PM
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TMan51
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OldStuffer wrote: I've never had a .45 case stretch, not in 14 years or so of shooting it.

OS, if I had a pile that needed trimming, I'd probably just throw 'em away myself. :wink:



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 Posted: Mon Apr 4th, 2011 02:32 AM
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noylj
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Please, don't trim your .45 Auto or other straightwall pistol cases. Best accuracy come from those cases that are no shorter than 0.005" of max length.
The critical measurement would be the sized length as that is the length that in going into your barrel.
When you size the case diameter down, the brass has to go somewhere.
I have been reloading for over 35 years and have NEVER had a pistol case that needed to be trimmed. The only cases I "might" trim are rimmed cases for revolvers as they need a roll crimp that is case length sensitive.



 Posted: Tue Apr 5th, 2011 10:23 PM
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runfiverun
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the rimmed do like to be the same length for the roll crimp.
i have a batch of 38's that have stretched, but they have about 20 reloads on them.
i'll take same length cases over all short ones anyday.
keep them in a tolerance range and you'll be fine.



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