Been trying to figure out what might be able to fit the 3 calibers I load,
loading 10mm, 45-70, and 500. Imagine that one or two of the calibers
would end up being compressed which wouldn't bother me

haven't noticed an overlap in the load data I've found so far, anyone
have ideas ?

Sounds to me like you've got your work cut out for you - ! The handgun ammo needs a fast burning powder and the 45-70 requires a moderate burn rate powder.

Don't think you can do it without compromising something...too drastic a differecne in cases.

Besides...WHY? IF you use one powder for all three, that powder runs out 3times as fast. If you use a specific powder for each, will delay powder buying by a factor of 3.

In the end, with powder prices pretty much the same for each pound, end up spending the same amount.

yea guess you're right. Will just start collecting powders I guess :)

Unique is about the only thing that comes to mind, but it'll definitely be on the light side for the .45-70 (which isn't a bad thing as that will drastically cut recoil, LOL).

Rednoise, what you're asking for is a pickup truck to take the garbage to the dump that will also win the Indy 500 on Sunday......
Ain't gonna happen.
Get the powder for each caliber that you think is best- there's no such thing as 1 'all around' powder, just like there's no such thing as one all around vehicle.