Originally Posted by _The_Shadow
Bullseye is a very fast burning powder with a less than density than other choices.
It can be used for 10mm, but pressures rise rapidly, If this is what you want to use be mindful of the possibility of double charges(NOT GOOD!) Adhere to the data if you have correct data. I have no data below 150grain bullet weights.
Good luck and be safe!
Great advice from the Shadow.
Bullseye was designed for 38 target loads at 2.7grs w/ a 148gr WC in the 38Spl case. Although it has found use in a broader spectrum of calibers, there are so many newer powders which have much broader spectrum of uses, at safer pressures, and better loading densities, it is a very poor choice for the 10mm, especially for warmer loads.
It is the pinnacle of bad combination of assumptions to combine using the nearly-fastest burning powder available with the thought that 10mm load data is watered down. In fact, 10mm load data is what it is. I want you to run (not walk) to the thread about learning pressure signs and variability in loading here: http://glocktalk.com/forums/showthread.php?t=179485
If you want to use up that Bullseye in the 10mm cases, pick a load that is 1/3 to 1/2 of the way up from starting to max, and load those and burn up the powder getting used to your pistol. Whatever you do, don't try to magnumize the 10mm with Bullseye.