Need a good recipe for a P90DC

I'm new to .45's, been a .38 / 357 guy for 35 years,.
Got a deal on a virtually unshot one from a close friend and decided to have a go at something new.

Picked up a Lee TL452-230-TC mold. Will be pouring with linotype, tin and pure lead. Will be powder coating.

Need an alloy blend and recipe that's worked well for you.

Range scrap lead works fine for .45s at non-magnum velocities, especially with powder coating. I wouldn't add any more expensive blends (tin or lino) than absolutely needed for mold fill out. I'd bet even pure lead would work with powdercoat, that seems to be what Federal is doing with their Syntech line.

I use wheel weights (WW) or range scrap...the 45 is a low-pressure, low- velocity cartridge and doesn't need hard alloys. In all honesty, most handgun cartridges don't...I shoot WW alloy at full 357 and 44 mag velocities with no leading, and I use traditional lube-groove designs with soft lube. If you're powder coating, the hardness matters even less.

Wheel weights aren't happening, not around here
My son is a mechanic and he rarely see's anything but the stick on zinc ones.

Neither is range scrap. I can get a little bit now and again, but very little and not very often.

I have a few hundred lbs of Lino and the same in lead, plus about 20 lb of tin.
I also have 2K lbs of hardened 7 1/2 shot but I'm loath to melt that down as I load a lot for trap

As noted, you don't need a hard alloy for the lower velocity .45 acp. Lino is expensive & only necessary for hardness & such.
There are many recipes for blending alloy to make bullets. I'd check out the vast amount of information over on the "cast boolits" forum. There is where you can really find a lot of excellent info on blends to suit your desires.
Powder coating actually anneals the bullets,, to a degree. But they are still plenty hard for great bullets.
I use a lot of WW's here,, and range scrap. I usually mix 70% ww to 30% pure for much of my shooting. And I PC my bullets as well. I often use range scrap that's already been PCed or cast just as it is. Jacketed stuff gets smelted & I treat it like pure lead. Of course,, I own a range,, so I have access to such stuff.