Originally Posted by
Mike R.
I just bought a Lyman GPR in a 54 cal.
Would some of you guys that shoot a Lyman GPR (54) help me out with some basic info?
Like, what size ball you shoot? powder (FF or FFF)? Cap size...10 or 11? grains of powder (70, 80, 90)? patch thickness and lube recommendation?
Right now I'm casting my own balls, using a Lee mold, for a 44 Remington. They seem to be a tad bit larger than the 451s that are store bought. I'm wondering if this will hold true for round balls I cast for a 54 cal. rifle?
Thx!
I don't own one now, but i've had three of them, so I can help some.
I used a .530 ball with a .015 or .018 patch. I used mink oil for patch lube bought at TOW.
I used 3F powder. It ignites a bit easier, has a bit more power, and less fouling. 70-90 gr will work. See which one is the most accurate.
Use #11 caps. The #11 CCI magnum caps worked the best for me.
As you can see the .44 C&B revolvers are really .45 cal. It doesn't apply to the GPR. It's a .54 cal.