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Been a while, but I am pretty sure sub-three-inch groups were the norm with a patched round ball in a .54 GPR at 100, rest with somewhere in the neighborhood of 100-110 grains of FFg. Lyman did the ballistics chart in their old classic Black Powder Handbook using FFFg. Page 118 shows a .535 PRB under 1110 grains G-O FFFg getting 1731 fps from a 30-inch barrel. Note the use of musket caps in their tests.[ATTACH=full]293856[/ATTACH]
Been a while, but I am pretty sure sub-three-inch groups were the norm with a patched round ball in a .54 GPR at 100, rest with somewhere in the neighborhood of 100-110 grains of FFg. Lyman did the ballistics chart in their old classic Black Powder Handbook using FFFg. Page 118 shows a .535 PRB under 1110 grains G-O FFFg getting 1731 fps from a 30-inch barrel. Note the use of musket caps in their tests.
[ATTACH=full]293856[/ATTACH]
