Big Richard Don't you have an owner's manual to go with your rifle? If not I suggest you call T/C and ask for one. They will send you one out free of charge. In it you will find loading data. I'll give you some loading data for both roundball and conicals. The first one will be round balls.
.490 dia. rb bp charge muzzle vel. muzzle energy
175 gr. rb 50 gr. 2fg 1357 f.p.s. 716 ft. lbs.
175 gr. rb 60 gr. 2fg 1434 f.p.s. 799 ft. lbs.
175 gr. rb 70 gr. 2fg 1643 f.p.s. 1050 ft. lbs.
175 gr. rb * 80 gr. 2fg 1838 f.p.s. 1313 ft. lbs.
175 gr. rb 90 gr. 2fg 1950 f.p.s. 1478 ft. lbs
175 gr. rb 100 gr. 2fg 2052 f.p.s. 1637 ft. lbs.
175 gr. rb 110 gr. 2fg 2153 f.p.s. 1772 ft. lbs.Notice the charge with the (*) is in the middle. This is recommended by T/C for optimum accuracy. The bolded load is maximum load. Now for the conicals.
.50 cal. lead bullet wt. bp charge muzzle vel. muzzle energy
275-320 gr. bullet 80 gr. 2fg 1494 f.p.s. 1586 ft. lbs.
275-320 gr. bullet *90 gr. 2fg 1551 f.p.s. 1709 ft. lbs.
275-320 gr. bullet 100 gr. 2fg 1629 f.p.s. 1886 ft. lbs.
275-320 gr. bullet 110 gr. 2fg 1661 f.p.s. 2314 ft. lbs.350-370 gr. bullet 70 gr. 2fg 1327 f.p.s. 1447 ft. lbs.
350-370 gr. bullet 80 gr. 2fg 1418 f.p.s. 1652 ft. lbs.
350-370 gr. bullet * 90 gr. 2fg 1465 f.p.s. 1764 ft. lbs.
350-370 gr. bullet 100 gr. 2fg 1525 f.p.s. 1911 ft. lbs460-470 gr. bullet 70 gr. 2fg 1225 f.p.s. 1566 ft. lbs.
460-470 gr. bullet * 80 gr. 2fg 1297 f.p.s. 1756 ft. lbs.
460-470 gr. bullet 90 gr. 2fg 1374 f.p.s. 1970 ft. lbs.
460-470 gr. bullet 100 gr. 2fg 1416 f.p.s. 2093 ft. lbs.If you want to get in touch with T/C their number is 603-332-2333
Another thing I'd like to invite you to check out my Website
http://mamaflinter.tripod.com/ I think you'll find a lot of useful information there.