I've been loading for a 1970s Marlin 1894 for years. Marlin 44 cal rifles typically have a 0.431" bore, versus most 44 revolvers with a 0.429" bore. The Speer 44 caliber bullets are 0.429" diameter and do not group as well for me as do the Hornadys at 0.430" diameter. Sierra 44's are in-between at 0.4295" My best results are with Everglades Ammo 0.431" diameter 240 grain jacketed soft points. Unfortunately they don't have a 0.431" hollow point. 0.432" hard cast bullets work well for mid range loads.
YMMV.
Last edited by Oldidaho; 05/04/23.