I have used 150 gr. Ballistic Tip bullets in .270 Win. for several years now. I like the 150 gr. bullets for the high ballistic coefficient which they have. The whitetails I have taken have ranged from 15 yds. out to 300 yds. or so. I have never had a complaint about the performance of these bullets. I have had deer drop in their tracks and some ran a short way before going down but I' ve never lost a deer after shooting one with a Ballistic Tip. All shots taken are chest cavity broadside or quartering shots. Best group my A-Bolt Stainless Stalker has achieved with these is a 3/4" 5 shot group @ 100 yds. which isn' t too shabby for a factory rifle with no accurizing work done to it. If your Dad' s gun shot that good with them, then I would look no further for a deer load. I think he will be satisfied with them, I know I am. Good luck!!