In Waters Winchester .416 Taylor rifle, 70.0gr. IMR4320 with a 400gr. Colarado Custom went 2,401fps producing 5,116fpe, and 72.0gr. was maximum running 2,447fps for 5,320 fpe.

Ken ALSO ran the 300gr. Colorado SP's at up to 2,711fps using 45.0gr. of the same powder.