That groups was my first cast bullet test loads shot at 50 yds. MV was around 1600+ fps. it's just a cheap plinking load that can be used or small to med. size game.
I've hand loaded for the 54r for several years,back before good reloadable boxer primed brass or ammo was available I pull FMJ surplus ammo bullets and replaced them with a good quality .311 jacketed SP bullet and made my own hunting ammo. Of course it not as simple as pulling the old bullet and replacing it with a new one there are certain things you need to do,but it will work with brass and steel case berdan primed surplus ammo if that's all you have and a box of SP bullets.
Some old ammo I reworked from L
Bulgarian HB surplus,FMJ replaced with Hornady .312 174 gr. RN,Bulgarian LB,FMJ replaced with 150 gr. Tracer,FMJ replaced with Speer .311 150 gr. SP.
If you have the reloading tools and you find yourself in a survival situation and all you have is the FMJ surplus ammo you can pull and reverse the bullet which give you an open flat base bullet that similar to a flat nose bullet. The British call this a Dum-Dum bullet and Elmer Keith used it quiet a bit back in his day The Box O' Truth #50 - Shooting Bullets Backwards - Page 1