I like to fine tune the loads at the range with a Lee hand press so I made one a few minutes ago for my .204 to dial in seating depth and action screw torques for my new load.
Turns out a 38 sp case holds appx 21.5 grains of RL10. So I epoxied a short piece of coat hanger wire to it for a handle. I figure my end load will be around 22.5 to 23 grains so that will get me close enough for trickling. I could have used a .357 and used on of the methods described above to get another grain but this is close enough.
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