Cowboy Action Shooter; Endowment Life Member-NRA
The Original Rocket Scientist-Retired
"My Father always considered a walk in the mountains as the equivalent of church going."
If your bullet enters and exits through the ribs behind the shoulders you wont damage hardly any meat. If you hit a shoulder, base of the neck, spine, hind quarters, ect you will damage alot of meat no matter what you shoot them with.
Keystone 1, Over!
" I am lost in the dust of the chase that my life brings"
I will go ahead and agree with the previous posts for what its worth. Switching around can be bad if you make a mistake like sighting in with the 180's and forgetting and using the 165's. From experience you will probably be off by more than you will like. The shot placement is probably the most important thing. My 30-06 tends to shoot the best with a particular 180 grain and my .308 tends to shoot the best with a 165, so that is what I try to stick with. Why I have only those two very similar rifles, I have no idea.
I've shot Deer, Bear, Antelope, Elk and Sheep with my model 70 30.06. All these were shot with 180 grain core-lokts. In every case, if shot placement was good, they went down quick with very little meat loss. ( I'll be the first to admit not every one was good shot placement, but most were )
We are over thinking this some. First , good shot placement. Always does not happen. A 165, a 150, a 180. a 130 well constructed bullet will do better then the NBT's if the shot is a little off. 25-06. 257, 243 are awesome antelope guns. Just choose a good bullet. I have had less damage with a shoulder shot with a good well constructed bullet as a buddy decided to use a NBT in 257 weatherby and shoot and basically had an un edible goat. No need to switch grain bullets unless they are the nbt. If you think this is just all BS , keep shooting the NBT and you will find out the hard way. Shot placement is # 1 priority though.
take a look at the nosler accubonds i have had great luck with them and are a great hunting bullet
Cant go wrong with the corelokt! Just like father&son_outdoorsman points out!
165 grain accubonds will get the job done .
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I wouldn't throw the BT's away yet. If they're modern BT's and they're labeled hunting bullets they are beefier than the old ones. I'd call Nosler and talk to them.
Antelope are pretty easy to kill. 100 gr out of a 6mm or 25 cal is more than enough. I'm taking my 250AI with 100 gr TSX's this year. Heck, 55 or 60 gr 22 cal is enough with a good bullet like a 60 gr. partition. If you have anything that you shoot well just use it. Unless you NEED another rifle of course! Good luck with it!