Designing the 2-diameter paper patch bullet.

[Distant Thunder]

Kurt,

Keep on loadin'!

With Swiss 1 1/2 I have had good luck staying with the same weight when I switch lots and just let the compression be whatever it takes to load to your COAL.

I loaded 83.0 grains with the old Swiss with very little compression, about .060. When I went to the new stuff 83.0 grains require .150" compression for the same setting depth. That part is a bit inconsistent, but 83.0 grains of the old and 83.0 grains of the new shot the same, the compression difference didn't seem to matter. If anything the new stuff shot a bit better.

Same thing with my .40-65, 73.0 of the old and 73.0 grains of the new shot the same, but the compression is more with the new. Keep the weight the same and just let the compression be what it has to be. It will be fine.

I lucky enough to have enough Swiss 1 1/2 of all the same lot to last me a good long time. I shouldn't have to worry about changing lots again until after I'm old enough it really won't matter.