I did see a great improvement over the last range time with the 45-70 B.C. I did put a clover leaf group together 5 shot at the 50 yard target,but them 500 grain bullets have to go ,a little too much when it came to recoil.
I did use goex 2F black 15 rounds 65 grains and 15 rounds 70 grains
The 70 grains did shoot the best.
I also think what improvement in shooting was switching the front sight,My eye just can't pickup them inserts on the globe sight,I even when as far as drilling a large hole in the cover ,but still no good.
I will go back to them 405 grainers ,I also found the .459 diameter bullet work better then them .458