Ummm... 454 grams! :-) But I don't think this was the intent...
1 gram = 15.4323369187796 grains. To convert a value in grams to grains, multiply by 15.4323369187796.
454 grams = 16.01 ounces.
120 gr = 7.77588 g
1 grain = 0.06479891 grams. To convert a value in grains to grams, multiply by 0.06479891.