Loading for 10mmAuto

[PanhandleGlocker]

Seems that a few companies are making 10mm brass in the small primer variety now. I was wondering if anyone’s had any luck using Small Magnum Pistol Primers in 10mm Auto? I was checking my primer inventory and have 800 of these and not sure of what else to use them for.

I’ve heard of people using Large Magnum Pistol Primers in 10mm with slow burning powders. Can’t see why I couldn’t do the same with small primed brass.

 

[alank2]

I think with those slow powders you want a primer that is hotter so that they can consistently burn, so there is the need for magnum primers in the first place. Now, how does a magnum large primer compare to a magnum small primer? I have no idea, but I probably wouldn't push a slow powder with them simply because they are untested. It is probably safer to go with a medium/faster burning powder that isn't going to push a bullet near max velocity, but doesn't need the magnum primer in the first place.

 

[undeg01]

I load my 10mm with 800x. All my brass is large primer but I have tested it with both standard and magnum primers. Surprisingly, the difference in velocity is negligible but accuracy is substantially better with the standard primers. That being the case, I’d guess that small mag primers would do fine.

 

[PanhandleGlocker]

I load my 10mm with 800x. All my brass is large primer but I have tested it with both standard and magnum primers. Surprisingly, the difference in velocity is negligible but accuracy is substantially better with the standard primers. That being the case, I’d guess that small mag primers would do fine.

I’d have to look at my burn rate sheet but I have a pound of Longshot that I heard works well with 10mm and was thinking of using it.

 

[dennishoddy]

I've only loaded 10mm with Unique for range shooting at moderate speeds, coming nowhere close to max loads.

 

[PanhandleGlocker]

I've only loaded 10mm with Unique for range shooting at moderate speeds, coming nowhere close to max loads.

So you’re loading 10mm to basically .40s&w?

 

[dennishoddy]

So you’re loading 10mm to basically .40s&w?

Pretty much. I want to get the break in period over without beating the gun to death using magnum loads, and it's much more pleasant to shoot.
I competed for 6 or 7 years with a .40 in USPSA, so I'm pretty familiar with the loads that shoot soft.
I'll graduate to more powerful loads soon, so I'm watching this thread to see what everyone else is using.
I've even used .40 rounds in the 10mm. They shoot fine and I have thousands of reloads available. Lots of folks do that as well.

 

[Chris Hayes]

Pretty much. I want to get the break in period over without beating the gun to death using magnum loads, and it's much more pleasant to shoot.
I competed for 6 or 7 years with a .40 in USPSA, so I'm pretty familiar with the loads that shoot soft.
I'll graduate to more powerful loads soon, so I'm watching this thread to see what everyone else is using.
I've even used .40 rounds in the 10mm. They shoot fine and I have thousands of reloads available. Lots of folks do that as well.

Are you using moon clips? Both these cartridges headspace off the case mouth. Without moon clips a .40 cartridge would simply push up into the barrel further, removing it from the contact area/range of the firing pin.

 

[PanhandleGlocker]

Are you using moon clips? Both these cartridges headspace off the case mouth. Without moon clips a .40 cartridge would simply push up into the barrel further, removing it from the contact area/range of the firing pin.

IIRC It’s in a S&W M&P Semi Auto I believe

As for mine, it’s a Glock and I’ve heard you can shoot .40 out of them.

 

[redleg10]

I just use the small primer brass (SPP) for target loads with Accurate #5.