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I use a lot of the VV 500 series, having several rifles that digest nothing else but. The N540 works really well in the BR cases, all three of them - .20BR, .22BR and 6BR. The velocities attained in the .20 and .22BR's are pretty impressive. I also use the N540 in the fireforming load for my .17 Predator, with N550 being one of the very best powders to use in that case after fireforming. I've never worked with the .19-223, but I would think that the N540 ought to be right there, as far as burn rate, loading density and velocity. Just have to see how accurate it is for you.
- DAA
Don't mean to highjack this thread but what are you getting out of the 22br using N-540. I've been using N-133 in the 17machIV,22br and 223AI. Thanks for any information.