dumb ? I just have to ask

[445 supermag]

Ok guys I am just about ready to start reloading for the 10mm but was wondering something.  Can I use large pistol mag primers or not?  Just because I have a good supply of them and NO large pistol primers.

I usuall use these for my 445 supermag or my 41 gnr #2.

Thanks

Brian

[The_Shadow]

I use the magnum primers often, most loads don't really require them but some just work better using them, getting cleaner and more efficient burns using heavier charges!  If you are working at the upper extreme you might want to lessen a charge a couple of tents of a grain.

[445 supermag]

Shadow thanks for the fast reply.

I just got in 8 lbs of 800x and 4 lbs of H longshot so I am excited to start.

Appreciate the info.

Always work up loads...... always

Brian

[gofastman]

From what I read, 800x+mag primers+light bullets=BIG NO NO!

But, I have never worked with the stuff

[DM1906]

I use magnum primers almost universally (with calculated powder charge adjustment, of course) for a dozen calibers.  Much depends on availability.  If I go through a spell when my LGS has only magnums available, that's what I use.  HOWEVER..... DO NOT use them with 800X.  I tried to get them to work with many loads, and consistency was NEVER there.  That spells problems with high pressure rounds, and you won't know it's too late, until it's too late.  Save those magnums for just about any other powder.  Don't just substitute them, though (work up carefully, of course).

[DM1906]

NOT a dumb question, BTW......

[sqlbullet]

To re-iterate....

Work up a load with magnum primers.  There is a significant difference in both energy output and in the way the pressure curve peaks for a given powder with a magnum primer versus a standard.

More isn't always better or desirable.  On the other hand sometimes it is necessary to use what you have or can find.

[445 supermag]

Yes I will work up loads. I will start at the low end and increase .2 at a time till I get what I am looking for. Or I will use the mag primers with longshot.  But I dont want to just rely on longshot even though its one of. The best powders for the 10mm.

Brian

[445 supermag]

Oh I also  weigh EVERY LOAD... during development and when the load is close or at the NUCLEAR level

Brian

[gofastman]

What kind of magnum primers are they?

[blastfact]

I've used mag primers on my Nuke Blue Dot loads. It's better than the 4th of July.

[445 supermag]

What kind of magnum primers are they?

Federal

Brian

[blastfact]

What kind of magnum primers are they?

Federal

Brian

Fed primers are soft and have a great bang ratio. There box's are huge and many of us reloaders use them for our range ammo. Lee warns against using them because they are soft. But they are very easy to read. They flow good and flatten well against the breech. BUT if you hand weight and roll every powder drop you can still get a big FPS chrony read with them. There not the most straight forward primers.

Most folks pin there best loads on win or cci primers followed by rem primers. Feds talk to you before others,,,, So rock on!

[445 supermag]

Thanks for that info.

I always wondered why using fed mag primers I had such crazy ES FPS from load to load.  I mean I had ES range 50 to 80 fps even weighing each load.  Figured it was the fed primers but I have a good supply of them so I am stuck for now.  Wish I could find some winchester lp primers..   

But have to say I never had a problem using fed primers except for large ES in my loads.

Brian

[DM1906]

Federal primers are an animal all to their own (or used to be, anyway).  They're really great for light-strike race guns, but not so good for service-grade guns (heavy pins/strikers), in my experience.  I don't use them, unless I have to, and haven't in over 10 years.  I've ruptured plenty of them to know better.  The small rifle primers do well for use in small pistol magnum loads, as long as the pin/striker/hammer hasn't been lightened.  I don't know that the "softness" is the reason for Lee and others not recommending them for "auto" cappers.  The problems I've had with them is flipping in the slider type cappers from time to time on 4 of 5 progressive presses I've used, although never a problem with rotors.  I don't have any with APS, so that may not be a problem at all.  The Federal match-magnum primers (I don't remember the number, or if they're still available) on the other hand, do very well, but cost 3X last I looked.  I've never had one detonate while capping, even when stuffed in sideways or inverted.