Author Topic: 45 ACP - Large pistol primers vs small pistol primers  (Read 427 times)

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Offline FALer

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45 ACP - Large pistol primers vs small pistol primers
« on: July 25, 2019, 01:06:10 AM »
So what I've got here are Blazer 45 acp small pistol primer cases and a good supply of CCI #500 small pistol primers. I want to load 230 gr FMJ with Titegroup.

The load data off of hodgdon's website gives me a starting load of

4.4 grs  at 744fps

Here's the catch though, that data is for large pistol primers.

So, should I use less than the 4.4grns? How much less?
Maybe just call Hodgdon and ask them?

I'm wondering how much difference there's is between the two types of primers, in regards to pressure and how that influences the load data.

I should say I'm very new at reloading with less than 500 rounds loaded (9mm).
 
« Last Edit: July 25, 2019, 01:11:36 AM by FALer »

Offline larryflew

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Re: 45 ACP - Large pistol primers vs small pistol primers
« Reply #1 on: July 25, 2019, 02:46:57 AM »
Other than sorting so you're not trying to ram a large primer into a small hole I have not found any differences at all. Same chronological results and same accuracy for my (2) 45s but do have to add I don't shoot a lot of 45.
« Last Edit: July 26, 2019, 03:26:10 PM by Wobbly »
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Larry

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and CZ fanatic
NRA life since the 70's
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A rubber band pistol was confiscated from an algebra class because it was a weapon of math disruption.

Offline SI VIS PACEM PARRABELLUM

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Re: 45 ACP - Large pistol primers vs small pistol primers
« Reply #2 on: July 25, 2019, 05:11:47 AM »
Same here I find no difference in using large or small pistol primers as far as performance. Just the extra time it takes to sort the 2 styles.

Offline timetofly

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Re: 45 ACP - Large pistol primers vs small pistol primers
« Reply #3 on: July 25, 2019, 07:19:12 AM »
The Speer Reloading Manual #14 (pages 966 - 977) addresses small pistol primers by explaining that the small pistol primers were lead free and that there was not a safety concern with their use.  You could see a slightly lower chamber pressure, but you should not see any issues igniting the powder.


Offline Ken6PPC

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Re: 45 ACP - Large pistol primers vs small pistol primers
« Reply #4 on: July 25, 2019, 07:21:46 AM »
Don't sweat it.  I actually PREFER small pistol primed 45 ACP brass, and I use the same loading data for both LP and SP primed brass. 

Offline ReloaderFred

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Re: 45 ACP - Large pistol primers vs small pistol primers
« Reply #5 on: July 25, 2019, 01:35:18 PM »
Load them the same.  Well, except for the primers.  Otherwise, there is no discernible difference.

Hope this help.

Fred
After a shooting spree, they always want to take the guns away from the people who didn't do it. - William S. Burroughs

Offline FALer

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Re: 45 ACP - Large pistol primers vs small pistol primers
« Reply #6 on: July 25, 2019, 11:54:02 PM »
Sounds good folks, I appreciate all the feedback.

Offline Wobbly

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Re: 45 ACP - Large pistol primers vs small pistol primers
« Reply #7 on: July 26, 2019, 03:33:33 PM »
A little of the back story....

There was a huge cry of "foul play" when the small primer cases were introduced. But as soon as reloaders realized it meant no more primer mechanism change over to slip some 45ACP into their weekly run of 38Spcl and 9mm Luger they quickly became favorites.

There are actually fans on both sides now. People are actively trading small for large brass (and vice versa) on a 1:1 basis simply to get their brass collection all swapped over to a single primer size.
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