Berry's 185 gr HBRN 1.260"-1.265" OAL .472" Taper Crimp on the right compared to factory 230 gr FMJ on the left
When I did load development for Berry's 185 gr HBRN with W231/HP-38, I also used 1.260"-1.265" OAL for M&P45/Sig 1911. What I found at that OAL and large hollow base is that the load acted like 185 gr SWC/RN loaded very long and I needed to use higher powder charges for more efficient powder burn and consistent chamber pressures to reliably cycle the slide -
https://www.thehighroad.org/index.p...g-hbrn-plated-45-bullets.626092/#post-7733949
Hodgdon lists the following -
http://www.hodgdonreloading.com/data/pistol
For me 5.0 gr to 5.5 gr produced inefficient powder burn and poor accuracy and higher than 5.6 gr started to produce greater accuracy with reliable slide cycling. I even tried shorter 1.255"-1.260" OAL with .471" taper crimp to see if I could improve the powder burn and chamber pressure consistency (It really did not help much).
My powder work up went to 6.2 gr W231/HP-38 as lower charges did not produce reliable slide cycling and accuracy. Since then, I switched to RMR plated RNFP which seats the bullet base deeper in the case neck for more consistent chamber pressures with less powder charge -
https://rmrbullets.com/shop/bullets...-plated-flat-point-plated-new/?v=7516fd43adaa
FWIW, here are some chrono data for Berry's 185 gr HBRN and W231 (Note shorter 1.230" OAL - Springfield XD .45 ACP Tactical 5" Barrel, CCI primer, mixed Winchester and Remington brass) -
http://forums.brianenos.com/topic/121552-berrys-185-hbrn/?tab=comments#comment-1479774
- 5.6 gr 1.22 OAL 774.84 fps average, 47.6 standard deviation PF=143.3
- 6.0 gr 1.23 OAL 829.85 avg 22.08 sd PF = 153.5
- 6.2 gr 1.23 OAL 844.50 avg 26.41 sd PF = 156.2
- 6.4 gr 1.23 OAL 888.34 avg 21.68 sd PF = 164.3
- 6.6 gr 1.23 OAL 927.58 avg 23.54 sd PF = 171.6