Ammunition & Hand Loading > Cartridge and Shotshell reloading

Primer question - please help.

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tstuart34:
My dad made the same mistake with some CCI's he even loaded seated a batch of 40sw. He decided to load them but started way low and worked up to a low mid range. Never showed any pressure signs and didn't go kaboom. I would trade them if you can get what you need.

SemperFiGuy:

--- Quote ---sfg has had experience with this issue.  Can't find the thread at the moment but they are usable with a little caution.
--- End quote ---

Yes....  And I don't remember where and when we discussed that issue, either.

Here's a Good Google Search to employ in making your decision:  substitute magnum primers for standard   
Quite a bit of discussion of this topic to be found.

During the recent reloading component shortage, I've known experienced reloaders who substituted magnums for small pistol primers in their reloading processes.  Those Few Folks always used the lowest published powder grain loads in the handloading book when they substituted the magnum primers.

I watched some shooting from these reloads.  From what I saw as the outcome, there was no discernible evidence of high pressure.  No cratered primers, no flattened primers, no hard recoil, no Big Boom......nuthin'.   And not very much (1-2%) increase in chronographed velocity.  So--From what I've seen, you can't tell much--if any--difference.

My understanding is that magnum primers are used to ignite hard-to-start powders.

Me....I very carefully follow the published reloading books.   (And still manage to blow up .40XDMs.)

FWIW,

sfg

shooter:
 If your ever near Omaha id trade you standard for the mag primers

JTH:

--- Quote from: SemperFiGuy on December 01, 2014, 09:39:49 PM ---During the recent reloading component shortage, I've known experienced reloaders who substituted magnums for small pistol primers in their reloading processes.  Those Few Folks always used the lowest published powder grain loads in the handloading book when they substituted the magnum primers.

I watched some shooting from these reloads.  From what I saw as the outcome, there was no discernible evidence of high pressure.  No cratered primers, no flattened primers, no hard recoil, no Big Boom......nuthin'.   And not very much (1-2%) increase in chronographed velocity.  So--From what I've seen, you can't tell much--if any--difference.

--- End quote ---

Yep---I used magnum primers in my 9mm reloads for a couple-of-thousand worth of ammo. Dropped the powder charge a bit, chronoed, brought the powder charge back up, chronoed...

...found no effective difference when I did so.  Note, however:  I'm using this in 9mm at medium velocities, so I'm not reloading a high-pressure round in the first place, like .40. 

Next time, if I need to use magnum primers again, AND am still using the same powder/reload recipe, I'll won't even change things at all.  (If I change powders, I'll check it again, but don't expect issues.)

...but like I said, that was 9mm, not .40.  Don't really expect much difference with .40, but I would back the charge down to check it out first.

DenmanShooter:

--- Quote from: SemperFiGuy on December 01, 2014, 09:39:49 PM ---Yes....  And I don't remember where and when we discussed that issue, either.



--- End quote ---

I thought it had been discussed before but I couldn't find the thread.

Thanks for the info.

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