Wishful thinking

[Epaphroditus]

45LC, 45ACP & 450 Bushmaster all with one powder? They already use the same bullets so maybe I'm aiming too high ... so to speak.

So many calibers so little time and limited resources so gotta maximize by using as few powders as possible for as many calibers as possible.

IMR4198 is great and works for 45-70, 30-06, 308 and 7mm WBY so there is hope!

[3RDGEARGRNDRR]

according to quickload, a fast magnum powder might work to push the projectiles at decent speeds but no guarantees on cycling your weapons.
using 230 grain data and 2400

45acp 11.5 grain for 877 fps 5" barrel
45LC 15 grain for 927 fps 6" barrel
450bm 35grain for 1392 fps 20" barrel(very slow)

these are all theoretical, no guarantees on you staying out of the trauma unit

[Epaphroditus]

Does quickload have data for Hornady FTX bullets? $150 is a bit rich for QL at the moment.

[3RDGEARGRNDRR]

Does quickload have data for Hornady FTX bullets? $150 is a bit rich for QL at the moment.

yes, but these will not be nominal in a 45acp due to length and too slow to expand.
An FMJ/ HAP/ XTP might be your only ticket and at these speeds,

for the record, using just one powder for all of these loads is not at all recommended, too many compromises left on the table among many other things.

[JagerDog]

The 45c and ACP can share powders. Anywhere from Red Dot to Blue Dot ranges. 450B...I doubt it for typical ballistics. Maybe reduced.

[devster55]

There is really no do all powder I usually choose rifle powder and one pistol. I use blue dot and RL19

[rm1911]

Something like bullseye or unique will work but you won't get magnum velocity. Which should be fine for range fodder. Blue dot would work in all three and give a little more velocity with magnum rounds. Lots of versatile powders, just some trade offs.

[CGT80]

We need more details, OP. What do you want to do with this ammo and what type of action do the guns have?

45acp and 45 colt will use the same powder and there are a lot of good choices. 45 bushmaster is one I am not real familiar with, but I think it is more like the 460 mag that I load up. 460 mag for my revolver will run between 1000 and 2000+ fps depending on the load, and I don't have to worry about working an action, as you are probably doing with the bushmaster load.

Two powders would easily cover those three cartridges. While it is nice to not have a huge number of different powders, there is usually a need for a handful if you shoot a variety of different guns.

[Whiterabbit]

I bet the real test is cycling both 45 acp and the bushmaster. I'll bet it will be very easy to find a powder that will do it all. And when you do find it, you'll either have LC+P and ACP+P, or you will have a 450BM that does not cycle.

Just a guess, that's without data. but I especially guess that if you use the same bullets.

I have to wonder if you couldn't make it work after specifically tuning the BM to cycle after load development. shorter gas system, bigger port, that kinda thing.

But the biggest thing I suspect is that ultimately you will be riding wild on the handguns and cat sneeze loading the BM.

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if I were serious about this, truly serious, I'd have some conditions going in:

my 45ACP would be a 460 row or +P or the like
my 45 colt would be a ruger or stronger.
my 45BM would have a VERY specific purpose (for example subsonic loads with BPCR bullets at 500-600 grains)

then I'd have at it. But I've already violated the "use the same bullet" part.

So I dunno. Good luck to ya.

[Whiterabbit]

I use 4198 in the 460S&W and I would be INCLINED to try it if I had a strong (Ruger OK) 45 colt with a 400+ grian bullet. I do imagine it would work in a 300 grian bullet but I have never tried it. But that would be my thinking. I bet the 4198 could be downloaded into cowboy load territory, but it's just so much easier to load if you know your ceiling is at least 25-30ksi.

I have a really hard time seeing 4198 work for 45 acp. the case is so small.

I'd be looking at magnum pistol powders as suggested, or maybe something like an SR4759.