HiredGun

I don't know that I would endorse that line of thinking at all. It would be very unsafe to try to load a 45 ACP to the same pressures a 10mm operates at. If you want a 10mm just get one. There are many in stock at various online outlets. You could have it overnight if you wanted to pay the extra frieght. Bud's Gunshop sells them with free frieght and has plenty of 10mm's in stock.

My full power load for the 40S&W is 8.5 grains of Longshot behind a 155 grain Hornady XTP lit by a CCI-550 magnum primer. Velocity out of my factory barreled G23 is 1266fps with the ES in the 10 and under range. I have no trouble hitting IHMSA 22 targets to 100 yards with it. In the 10mm I use 9.5 grains to get 1300 fps out of the 180 grain version of the same bullet lit by CCI-350 primers. Longshot burns so clean in both my Glocks it is hard to tell they have been fired after 100 rounds. My cases stay bright and clean. It is well known in these two calibers to give high velocity with minimal pressure compared to the same velocity with any other powder. As with any load info back up 10% and work up to it.