Like Cayugad said, you have to try them and see. You could have 3 bullets that all weigh 250grs and have each one of them shoot totally different. Even a .44cal bullet that weighs 250grs vs the same bullet in .45cal will shoot different.
Bottom line I'd just never assume just because the bullet weighs 250grs and that's what your other bullet weighs that they'd both shoot almost the same. I'd never ever go hunting befor I went to the range and tried them out and sighted in my mler with them first.
Good Luck!
(BP)