peanut,
How much 777 FFFG was you using? My Huntsman loves the .503" diameter 460 grain No Excuses, .518" diameter vegetable fiber gasket wad, and 80 grains 777 FFFG (tapped and settled). With the conicals, you should get an accurate load somewheres between 65 and 85 grains. The key is getting a measure that allows you to make 5 grain changes, most have 10 grain intervals, and you may not find the best. The very best way to determine the powder load is to convert the volume to weight, 100 grains 777 FFG by VOLUME = 77.7 grains by WEIGHT on my beam scale. This may vary slightly due to different Lot #'s, humidity, granulation.
Don't give up on those 460's, you will love them once you get your charge figured out.
Illhunter,
My 2003 24" SS Huntsman Owners Manual states a conical maximum of 470 grains/80 grains powder for best results. I have heard that some of the newer 26" barrels have a 490 grain maximum, but read YOUR Owners Manual for your particular barrel.
NOTE: These loads are recommended for optimum accuracy. Exceeding them is not likely to increase performance and can result in higher pressures and unsafe conditions. Do not exceed propellant manufacturers' recommendations. Loads recommended for FFG black powder may also be used for Pyrodex RS on a volume basis. This rifle is designed for #209 primers.
LOADS FOR MUZZLELOADING
Conical Bullets
Projectile Weight (grains) Black Powder Charge FFG (grains)
250-390 90
400-470 80
Saboted Bullets
200 100
240 100