I buy Remington 155 FMJ bullets in bulk packs od 1000. HS-6 powder has been the best by far in my loads, with Power Pistol close behind.\
I load to duplicate the ballistics of the W-W 155 Silvertip factory ammo that I use for serious social shooting.
IMHO, the 180 gr bullets are fine for the full size 10MM, but a bit too heavy for the .40.
I want at least 1100 FPS from a defensive handgun, and the 155 grainers get there.
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"For your tomorrow, we gave our today."