Don't put a lot of stock in what I'm saying, no experience, but you got my curiosity up and I just measured water capacity of .41 Mag against 38-40 cases with a bullet deeply seated kinda maybe sorta like a 215 gr would be...result of my crude comparison is there is not a helluva difference in case capacity, 14% but actually not that much because of the bottle neck style the .38-40 is 36 gr to full and the .41 is 31 gr..... so I'm wondering if you could use 41 mag start loads? Or...Ken Waters pet loads has 38-40 Ruger data with 180 ish gr bullets...but I guess you knew that.
