I’ve loaded it successfully in the 9MM, 9x23 WIN and 10MM
It has performed well in all three and one of the top accuracy
and velocity powders in these calibers loading jacketed.
I don’t load for the 40 Short & Weak but Hodgdon has published data for bullets 135gr. – 200gr. using it and Hornady using the 180’s to 200 grainer’s
One of the reasons this powder performs so well in these calibers is you can safely load all of these calibers over 30,000 PSI
The Longshot from my experience with it really doesn’t start working “productively” until you get some pressure up on it which is easily done in each of these calibers.
You can try it in the 45ACP and the GAP but here you will never be able to generate the higher pressures the powder performs so well at.
If it was me, I would save the Longshot for use in the high pressure calibers where it works so well and apply more “appropriate” powders to the 45ACP and the GAP
Good Luck