Hi, I have a Martini Enfield single shot .303 Nitro Proofed with a good bore. Putting the sights to one side, it is remarkably accurate with 38grn Vit 140 behind a 174grn (old military spec MK 7 Ball) I am about to enter a competition which requires black powder only; what load should I use? will it work?
I have Swiss #3 and #4 plus some fine powder I used for .44 percussion revolver.
I have the 170grn .303 FMJ BT Bullets PPU Open at the rear ( is this what is called a spritzer?).
I have never had much luck with cast bullets in any of my .303s but if I have to what load? My lee mould throws a 185grn boolit.
Range for comp 200 yrds