I only load 44spl,no mags, and 4.5gr of Trail Boss under a 240gr hard cast .430" bullet in Starline cases with a S&B LP primer at OAL of 1.460" works well for me in 3" and 4" guns.I apply a heavy crimp.

I get a right around 725fps out of a new 2007 4" Model 21-4

Very pleasant range round you can shoot all day.

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