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December 2, 2009, 10:31 PM | #1 |
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Join Date: January 6, 2007
Posts: 49
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small pistol magnum primer in 40 S&W?
I am about to start reloading 40 S&W for the first time and as others have hard time finding primers, specifically small pistol primers as called out for this caliber. I have been able to locate some small pistol magnum primers and was wondering if I could use it on this caliber? Is it going to make any difference in pressure, accuracy or velocity?
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December 2, 2009, 10:53 PM | #2 |
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Join Date: October 14, 2009
Location: Farmsville, AZ
Posts: 305
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Personally I would be hesitant to use SPM primers on .40. It is already a high pressure load and I would be concerned about raising the pressure too much. But I hope we can get some of the more experienced guys to ring in. I would like to know more on the topic as well.
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December 3, 2009, 12:30 AM | #3 |
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Join Date: January 23, 2008
Location: MI
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When changing any component, start at the start charge and work up.
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December 3, 2009, 07:48 PM | #4 |
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Join Date: May 17, 2008
Location: Far West Texas
Posts: 200
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small pistol magnum primer in 40 S&W?
I am currently using Small Pistol magnum primers in my .40 S&W loads and haven't had any problems. From more experienced reloaders than myself they add anywhere from 5-15 fps depending on the load. Again as counselled start from bottom and work your way up always checking for signs of pressure.
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December 3, 2009, 08:27 PM | #5 |
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Join Date: February 21, 2002
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I have used magnum primers in loads that call for regular primers quite a bit. I have done this particularly with ball powders and have done it with many non-ball powders as well in the 40SW.
I start out with the powder at the minimum listed charge weight and try never to exceed 10% below the max listed charge in the work up. That may be a little conservative, however, I have attained good accuracy below max and have stopped the workups before going into the "danger range". As an aside, I couldn't tell any difference between regular Remington SP and Federal SP Mags across the chronograph, when comparing identical loads of powder. However, I did not charge higher than 10% below the published max.
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December 6, 2009, 09:59 PM | #6 |
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Join Date: November 21, 2009
Location: Olympia,WA
Posts: 8
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SPM in 40SW
Like all the others I have been using SPM primers in my loads without failure. Like others mention start off light and work your way up..I shoot a cast 175 grain truncated nose bullet with 5 grains of HP38 without any failure. Happy shooting =)
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