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Don Fischer's picture
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Selecting primer's

Years ago it was always suggested to use magnum primer's when using spherical powders. Seem's those powder's have a coating that is a bit hard to ignite. Well I've never used a lot of that type powder so when I found a keg of H414 a while back, I just used my standard primers. They didn't work to bad but I was using 70gr SMK's in my 243 and considering the bullet didn't like what I was getting. Looked thru my primes cabnit and found one bow of Fed 215's, there was 15 left in it. Reloaded the two best loads I'd found with my favorite Herter primer's and the same loads with the Fed 215's. Well the 215's cut the group's in half. Now instead of pretty nice group's. the bullet's hole's touch.

That spherical powder sure does meter nice too. Now that I have so much, I'm gonna find other use's for it.

bitmasher's picture
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Selecting primer's

I've noticed that as well. Switching to magnum primers in a 6mm Rem load using win 760 improved the group size, with no other changes in the load.

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Selecting primer's

It has always been said in reloading that you need to play with a load to find out what your rifle likes. I have a 22-250 that loves a certain combination and load length. If you change the power charge just 1 or 2 grains the accuracy will go out the window from where you can cover 5 shots with a dime to needing a half dollar. It isn't much but it is enough.

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Selecting primer's

The coating on the powder might deterimine what primer to use. But, overall with spherical or extruded, what really is going to be a determining factor when working up a load is the burn rate of the powder. Makes not difference if it's ball or stick. Generally use magnum primers with heavier grain loads of slower burning powders. Use regular primers with faster burning powders. Let burn rate and case volume be the determining factor. That's what I'd advise to start with. Later you can modify the load and the components as you see fit.

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Selecting primer's

Not exactly the straight-up response to your question, but relevant none-the less...
Back in 1985, probably the best review of different primers was published in Precision Shooting, I've got a copy and it is an interesting read...

Typically, I've found I don't necessarily need a 'magnum' primer for most published ball powder loads, but going with one of the hotter standard primers isn't a bad move.

Don Fischer's picture
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Selecting primer's

I think going hotter is better unfortunately I don't really know which are hotter. From the looks of the primer flash photo's I'd say Rem 7 1/2's have a lock on that. Lot of guy's swear by Win and Fed's. I have not had a lot of luck with Win myself but Feds have worked well when I used them. But then they were always a bit hard to find so I didn't use them a lot. Other than for ball powder, my favorite primer for most loads is an old Herter's 120. I have worked up loads with WLR and CCI 200 and changing to Herter has usually improved the group's. They were made for Herter's by Teikoku Kakohin Co of Japan. I still have about 10 or 12,000 of them.

JJD
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Re: Selecting primer's

I'd be interested to see the same data on different lots of the same brand of primers.
I believe in many cases consistancy is more important than minor differnces in performance between brands.

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