pressure effects of shot type

[J.B. Books]

Originally Posted by Rick Losey

Researching Nice Shot it says you can use any lead load recipe but according to what I see on reloading boards the pressure seems to increase by about 500 PSI, not a barrel buster but still an increase.

Nice Shot or Ecotungsten raises the pressure from a published lead recipe by 1500 psi, not 500.

This information comes from Nice shot but they bury it in the comments section of their reloading blog.

" Big Dan said...
I'll try to answer both posts at once.
Starting with Jay,
Nice Shot works excellent and kills with the lethalness of lead. I suggest not trying velocities above 1300 FPS. because of setback increasing pressure and I have not seen many loads for lead above this anyway. There is no need for steel shot wads or components using Nice Shot either. I do not know what you consider long range for geese but I've been using 1-1/8 oz of #2 Nice Shot @ 1250 FPS. and knocking geese dead at 50 yards.


As for Bismuth weighing in at 9.6g/cc is lighter than Nice Shots 10.2g/cc. Bismuth also gets a little lighter if alloyed with tin to keep it from shattering. The hardness is 14.0~16.0 Brinell. A little harder than magnum lead shot. Hevi-shot (12 g/cc) has some outstanding performance but many of us either can't/don't want to shoot the load through our barrels. As for what sets Nice Shot above the other shot types is its ability to be used with older or finer shotguns, lead loading data and components as long as you stay 1500 psi under maximum pressure for the gauge you are loading for.
"

http://ecotungsten-niceshot.blogspot.com/