I have Winchester SPM primers. Can I use these in place of Winchester SP primers? What do you think. Any worries about increased pressures or anything
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As long as you're not using maximum loads, you'll be fine.
A lot of people I know have been doing this in the last couple of years with no problems whatsoever.
Here's a good video explaining the whole thing.
This message has been edited. Last edited by: Flash-LB,
My experience is the same. I use them in place of standard small pistol primers with no ill effects. I do not load any of my shells close to the max pressure, though.
Indeed, the thought just entered my head that you might get better (more uniform) ignition and powder burn in very light loads if you use magnum primers.
Thanks for the advise, guys. I'll give it a try.
The answer is… who knows and, you and I certainly have no idea what’s really happening.
The owner of a well known “boutique” ammo company told us years ago that pressure can go up, stay the same and he’s even seen it go down with magnum primers. So who knows.
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You didn't watch the Video did you? They measured pressure in the testing.
I saw NO difference among six different small primers in 9mm with HP38. Well, the Remington small pistol was a little faster than other brands whether pistol, magnum, or rifle.
Large primers in .45 with Bullseye did make a difference, so when my bullet order comes in and I start loading .45 Small with small pistol magnum, I will chronograph a series.
I used them in my light plinking loads for years with no problems. I’ve also chosen to forgo state mandated psychiatric treatment in favor of self administered electronic shock therapy.
The conventional wisdom was that magnum primers could increase pressure. I don't know.
If you are at or close to maximum loads, any change in components should probably cause you to drop back on your powder charge a little and work your way up to what gives you what you want.
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Yep, but your accuracy my differ somewhat. Rod
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I’ve been wondering about this also. A friend has been acquiring reloading components and primers have been the hangup. I recently was given 1000 CCI SMP’s together with a set of 30-06 dies that I passed along to him.
The primers are probably circa 1980-90 era, box looks dry, hopeful that they are still good.
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Unless they've been wet, they will be. I've still got some that are from the early 1970s that are good.
I used magnum primers all the time for lower standard deviations and more accurate loads. It usually takes 0.2 grains less for the same speeds.
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