Sieger,
Problem is the UMC is nowhere near as close as it is a 115gr bullet. A 123 grain bullet going the same speed would be considerably hotter.
These are the results and they don't lie. It's also common for many rounds to be under published velocities as test barrels are 5-6". I've fired the Winchester NATO from the glock before, and I believe it was in the low to mid 1200's. Keep in mind it was 5 degrees during testing. Cold weather is proven to slow cartridges.
I fired ZQ1 Turkey ammo, which is also NATO. Results were:
P08
1161
1150
1138
So similar. I only fired a couple of these types, as these rounds are way to hot to be fired through luger continuously. The recoil is more pronounced as well.
I fired two +P bullets, one 115gr +P barnes DPX and one liberty +P 50gr.
Barnes DPX 115gr +P
P08
982
Rather pathetic for a "+P 115" Standard 147 was faster at times! This would be a safe load for Lugers. I tested this because last year they were getting pathetic velocities from G19 of 1050 average so I figured same in P08.
Liberty +P 50gr
P08
2093
Advertised is 2000, so it's on target.
And as your question about heavier bullets I shall answer with a question: Why not?
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