Dusty ,
I'm still on track to convert my 45LC Henry to 44 Henry Flat C.F. (or as close to it as I can get without having to buy $1.10 each brass that won't accept the 248 Grn modified nose Old West Bullet. (44 Russian Cases are getting the nod, but when I do mine I'll leave the chamber a bit longer to accept the 44 Rem/Colt C.F. as well, so my Henry will be a two caliber shooter; 44 Henry Flat C.F. when I shoot my C & B pistolas, and 44 Rem/Colt C,F. When I shoot my Remy original Conversions. The difference in Chamber length is only about 1/8-3/16" . I personally do not think the "free space"(it's the same as the jump space in a cylinder) will affect the 44 Henry Flat Round. It may produce more blow back, but I guess I'll find out. As a side note all the bullets will be modified nose type.