If one were to enlarge the design of Lyman 457130, the 45-70 "Collar Button," How might one expect such a boolit sized ~ 0.470 - 0.475" to perform in a Martini Henry with its odd Henry rifling? Say the boolit is pushed by 10 to 15 gr of Unique and flying at 1000 - 1300 f/s?
I am contemplating this with a call to Accurate Molds in mind.
Thanks for any constructive ideas on this.