This is almost like backwards engineering because I'm already successfully casting and shooting a PCed Lee 340gr boolit from my ported 1895 45-70 Guide Gun but I'm not real familiar with the typical bore dimensions of the 45-70 like I am with various 30 calibers.
To add to the confusion is the fact that the Lee mold is marketed as a .457" as is their sizing die. I thought a 45-70 was supposed to have a .458" groove diameter so something isn't making sense here.
I'm sure the reason my boolits are working is because the PC and I'm not sizing them but I'd like to size them if for no other reason than to have them starting all the same size.
So my question is for those of you shooting the Marlin 45-70 (standard 6 groove rifling) if you have slugged your bore what dimensions did you get and whether you slugged it or not what diameter are you sizing your cast boolits? Thanks,
Motor