I've shot a few whitetails with a few different 1-9" ROT 260 REMs and thinks that if you're going to primarily shoot deer with an occasional coyote thrown in, the 100 grain Partition would be my choice. If primarily coyotes with an occasional deer thrown in, I'd go with the 100 grain BT. I have found that in most of my rifles, both 100 grain Nosler bullets would group within 3" of each other at 200 yards and could be used interchangeably if 1.5 MOA accuracy was acceptable to you. You might want to see if your rifles with do likewise, as 100 grain BTs are a bit less expensive than 100 grain Partitions.
If you were only going to shoot deer with your 260s, I'd recommend the 130 grain AB, as it is the primary bullet that I've settled on for shooting deer with my 260s and 6.5 CMs.
