I am confused ask about R15 in 6x45, then conversation goes to 204 Ruger.
Never tried R15 in 6x45 or 6TCU, H335 gave me best of speed and accuracy in pistol or rifle. It is a very forgiving cartridge, 60-80 grain bullets work well with a lot of powders.
204 Ruger, I have tried several CFE223 is what I settled on for my use, only run 40 grain bullets.
R10X, make sure to use a thick cup primer. I had a lot of issue with CCI 400’s in warm weather. It will spike in hot weather. Other than that it did very well.
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