Haven't seen that with my experience with 2400 and 215 gr SWC cast in my 41 Magnums. It was my favorite caliber for years and 2400 was my go to powder for Magnum 215 gr cast loads in 1,200 - 1,275 fps range. Unique and Universal for mid range loads in 950 fps - 1,000 fps range. I no longer own a 41 Magnun, my choice but recommend the 41 Magnum over 44 Magnum, but that's just me.