So I got a wild hair up my ass that I wanted to replicate the 300 whisper out of a 7.63x39 platform. I found this page of reload data and I found this source for 200 gr bullets. I'm wondering if the pressure levels between the x39 and the 300 are close enough that I can use the 190 (200gr) reload data from this page for load testing. Let me know if I'm just nuts or if this could work.