A friend and mentor gifted me a pair of molds ( with handles and gas checks!)
First is a NEI 45 224 GC and the other is a Lyman 225415.
I'll have to come up with a sizing die. I'd like to get Buckshot to make me one. I'll also have to get me an Mdie.

Anyway, I'd like some guidance/direction on getting started. The rifle is a 1/9 twist CZ527 varmint. I can see this being a tedious little bugger.
I was also given three sticks of LBT Blue Soft. I consider myself a Bens Red man, but this is supposed to be great stuff.

What would be a good powder for this? I don't know if any of the powders I have on hand would be appropriate. I don't mind buying any kind of powder, I have access to just about any kind out there.
I could care less about high velocity, it'll never be shot past 100 yards and see mostly 50 yards.
Would Unique work here? I have some ball powders, smp842, wc846, I also have some Varget and IMR4350. I've never cast for small bore, do they like a slower or faster powder? I'll likely cast these from water dropped COWWS.

Thoughts?

Thanks!