Zrex...Yea, my youngest brother has 2, one for him and one for his son...I actually killed the first 2 deer killed with his 1st .270...He's not as "into" this stuff as I am....He bought the gun, I gave him one of my scopes and sighted it in for him...I used Federal Premium 130 grain Sierra SPBT...They grouped well and that's all he cares about...When he bought his 2nd .270 I also sighted this one in and groups were in the 1 1/4 inch range....I guess we have killed 50 deer or so with these two guns, but, he has never changed bullets....As you know the Sierras are "softer" bullets, so if the range is under 100 yards, no he doesn't usually get a pass through, over 100, it just depends on what the bullet hits...
I would have tried different bullets years ago, but he isn't that type...I clean both guns and check the sight-in each year...Heck I even buy his bullets, usually 5 boxes, all the same lot number....Guess he's lucky to have such a good older brother...
As I have said in the past, it doesn't really matter...the middle brother has a 7mm-08 and a .280...He also has a son that hunts with us....They kill deer with both, use 140 gr CoreLokts...