Standard Small Pistol vs Mag Small Pistol Primers

5 shot string standard primers
1134
1142
1124
1132
1123
1131 Avg Es 19
Mag small pistol primers no other change
1216
1264
1183
1191
1211
1213 Avg ES 81

#rd String Standard small Pistol Primers
1121
1110
1097
1087
1111
Avg 1105 ES34
Mag Small pistol Primers 2nd string
1150
1140
1214
1172
1157
Avg 1166 ES 74
Glock 19 133 cast Unique powder

thanks for posting

I would be interested to see same test with small rifle and small rifle magnum added in still with 9mm

I got a Glock 19 ,, but,,
I have no idea what an average "ES" is? :!:

Quote:

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Originally Posted by SweetMk

I got a Glock 19 ,, but,,
I have no idea what an average "ES" is? :!:

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Extreme spread between shots fired and recorded

Thanks for sharing.

I've been meaning to quantify the velocity-difference myself but never got around to it - I appreciate your efforts :)

Very interesting. Would not have expected that much increase from Magnums.

Any data collected on the effect this has on the groups? Would there be any advantage to loading everything across the bench with the magnum primers? Say, just to simplify the inventory we keep on hand. Kind of like a free power mod. Just asking, because some day I like to think I may be able to buy primers again....
Thanks for posting up the info. It's interesting to see it in print.

Excellent data. I did a similar check for my Ruger 357 magnum revolver. I've had trouble getting magnum primers so I started using standard primers in the revolver and saving the magnums for my Henry 357 magnum rifle. In the 357 revolver results were very similar to what you found.