260 AI loaded Data Needed

[mike33]

I had a 260 AI put together some time ago and looking for some load data. I have been so busy haven't had time to break in barrel or form brass but want to get started. It is built on a trued 700 S/A 25" 8 twist Bartlein , McMillian hunting rifle stock. Im looking to shoot from 50-550 yards Pa. white tail hunting. I have a box of Berger 140's but would like to hear a good bullet for this twist that will travel as well open up for a clean kill. Years ago when my grandson was born I bought a Model 7 in a 260 for him. I used it for a couple years shooting 100 grain nosler bt. and was very divesting on deer. Appreciate any help!