Powder suggestion

Splatter

CGN Ultra frequent flyer
Rating - 97.5%
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Location
SouthernAB
Does anyone have one of those "Powely calculators" or some sort of program for suggesting powders for a specific case-bullet combo?

I'm loading .221 Rem FB with 68 and 75 grain bullets. 35-to-45 grain loads have been very successful with Lil'Gun, 4227 and H322.
I'm thinking of trying Benchmark behind those 75's; but I was hoping for a little boost up the learning curve if I can find one.
 
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