Originally Posted By NVGdude:
Originally Posted By Chris_1522:
What extra 500 fps?
Most "full power" 10mm is 180 @ 1300. Most .40 S&W is 180 @ 1000.
You insist that "we don't know" that Remchester et al is underloaded because "we don't have a test barrel" yet you insist full house 10mm must be 10,000 psi over spec in spite of not having a test barrel?!
Make up your mind. You can't have it both ways. Either 200 fps second faster is either slightly warmer or it's not.
10mm loaded to SAAMI spec (37,500 PSI) will give you 1250-1300 FPS with a 180 grain bullet. (If you use Blue Dot, and only if you use Blue Dot, anything else is closer to 1200 fps)
If you think you are getting more than that you need to buy a chronograph.
1000 fps is right for the 40S&W at 35,000 PSI.
Winchester claims 1290 fps from their 175 Silvertip (yet you claim it is underloaded) (note it's closer to 1250 in the real world, and that 5 grain weight difference does make a difference)
Hornady claims 1190 fps from their 180 XTP (yet you claim it is underloaded)
So explain to me how double-tap can get 1350 without a) lying, or b) exceeding the pressure spec.
Doing the same thing Norma did back in the day, run propriety powders.