RNS,

Saw the site, very good. What is the reference to Horneber brass.

In my limited cast bullet experience pressure rather than velocity seemed to be the main issue in terms of how high one couild load.

I calculate that the 550 should do 2500 f/s with 600 grainers at a tad less pressure than a 460 does 2500 with 500 grainers (which is already moderate pressure) so the 550 with 600 grainers at 2100 or so would be very mild pressure and as such should be ideal for gas check bullets.

Mike