I'd use in a 6.5-06 or a 6.5-06AI. I have 9 and 8 twist barrels available. Looks like you'd get better velocity from 6.5 x .300 Weatherby. Really not necessary to use a bullet like that on antelope.
I have available 1000 Winchester large rifle primers and 2000 Federal large rifle match 210 M primers recent manufacture. Asking $350 cash firm for all 3000. Meet F2F in Ames, Iowa, area as I can't/won't ship. If you will be passing through the area and decide you want them I would ask for a $25...
From my scavenger hunt for trigger parts, I have 2 extra sear springs in excellent condition for older style Remington 700 triggers; 1962 - 2006. These sit in a hole under the sear bar and not on a post like the newer ones do. $15 postpaid PPFF or no fee Venmo preferred.
Message here or email...
Go back to the scope the gunmaker put on and see if the inconsistency persists. If it doesn't you probably have defective scopes. Also check/recheck the base mounting screws just in case.