Re: damaged tip effect accuracy?
At the minimum, the flattened tip Noslers will have a slightly lower BC than the pointed ones. This would probably only be noticed in slightly more drop at very long ranges. For shooting less than 500 yds it shouldn't be an issue.
If the tip is also bent over to the side, I don't know from personal experience how much your accuracy would be affected. I know my rifle wouldn't shoot Hornady Interbonds with crooked tips worth a hoot. And those crooked tips were crooked from the factory, not from recoil in the magazine. My group sizes with the Interbonds was three times larger at 300 yds than with straight tipped Nosler BTs and ABs.
I didn't want to waste my time and barrel life trying to figure out if the Interbonds with straight tips would shoot better than the ones with crooked tips. So I never signed up for that experiment.
Use the flattened tips to foul your bore prior to you hunt, or to check the rifle's zero prior to a hunt - just to make sure you're still in the ball park and the scope hasn't been knocked off POI.