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Old March 22, 2013, 08:52 PM   #1
Join Date: July 29, 2012
Location: Lubbock, Texas
Posts: 43
Small primers v. Large primers for .45 acp

Hey guys, my question is why do some .45 acp brass have small primers and others have large primers? I even have some of the same brand brass that has both sizes.

Do I need to adjust powder loads between the two?
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Old March 22, 2013, 09:50 PM   #2
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So far, I do not know of anybody who is producing different pressure-tested load data for the two different primer sizes.

I do know that a lot of people are using the same powder charges with both.

Whether accuracy differs when primers are different sizes I have not read, nor determined by experiment.

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Old March 22, 2013, 10:39 PM   #3
Misssissippi Dave
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Join Date: December 5, 2009
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There probably is a few feet per second difference between loads. I use the same load with both large and small primers. I don't see any difference on paper or feel. I'm also using a fairly fast powder (WST).
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Old March 22, 2013, 11:15 PM   #4
A pause for the COZ
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Location: Braham, Minnesota
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I am almost certain they do it just to cause me Angst.

I have not read or noticed any difference in what type of primer is used.

I have a nice bag of them under the bench. Maybe load them if LPP get hard to find. Other than that I might trade to some one who likes to only stock one size pistol primmer.

Actually that's probably the reason we see them any way. Manufactures are trying to shave a couple cents off the manufacturing cost by ordering a bigger volume of SPP's
Usually if they do any thing thats not a performance or safety issue. it money related.
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