I'm not someone who shoots heavy arrows, but I would not use a 250 grain arrow for hunting.
I think it's best to get the arrow weight over 300 grains to avoid deflection, on ribs.
Normally, I do not just post opinion; my wife used a 250-255 gr. arrow and it deflected off ribs on a 17 yard broadside deer using a fixed head. She has killed 8 deer with similar or less KE, but the arrows were 330 gr. or more, so momentum does matter.
We are both using at least 380 grain arrows.