Magnum vs Standard Primers

[warrior23]

Can you substitute Magnum pistol primers with Standard Pistol Primers without reducing powder charge or should I expect higher pressure by just changing over to Mag primers and reduce the powder charge by 10%.

 

[stans]

Although there may be little or no change in pressures, it is still best to reduce powder charges and work up when substituting magnum primers for standard primers. Better safe than sorry.

 

[P95Carry]

In theory ..... stans is right of course .. in practice, and if loads not ''on the limit'' then in a modern proof firearm I'd not bother too much ...... always best tho to work up loads .. can't deny that.

I gave up messing with these long ago .. hardly seemed worth the hassle ..... but as someone pointed out on another thread where this topic came in ..... maybe the mag primers come into their own for real short tubes .... 357 defence snubbies for example. A need then to get most efficient, and fast ignition as possible.

 

[Desert Dog]

I pick up from 75 to 150 FPS on my heavier loads when I add a magnum primer. My standard deviation drops as well...

Mike

 

[kidcoltoutlaw]

Desert Dog

454 puma 92 with 300 xtp and 296 32 grains with a cci small rifle primer gives me 1966.how much do you think i will gain with the small rifle mag primers.i would have used mag primers but i was out at the time,thanks,keith

 

[winwun]

I found that using magnums in the .30 carbine solved the problem of unburned powder residue.

I also solved the problem by not using Hodgdon powder.

 

[kidcoltoutlaw]

300 xtp with win 296 31.4 gave a sd of 6 .i have not tried it for accuracy but with an sd of 6 how could it not be accurate,thanks,keith

 

[Desert Dog]

kidcoltoutlaw,

I hope you are using new brass, preferably Starline with that load.

An SD of 6 is excellent, but that does not mean it will be accurate. Most times the low SD does correlate to good accuracy, but you may have to move around in that load range; sometimes as little as 1/10th of a grain difference in powder weight make a huge difference in accuracy.

Mike