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That 11" twist will be marginal with many 100-grain bullets, particularly with the small 6BR case. If you have a marginal twist rate for a bullet you need high velocity, and you can't get it with the 6BR and normal pressures. If you stick to short 100-grain bullets like the Remington CoreLokt or Speer HotCore you may do alright, but use longer bullets like the Sierra BTs, Nosler BallisticTips and Barnes X-Bullets and you'll be asking for trouble.
If it were me and I wanted to use the rifle on a variety of game, I'd stick with the 12" twist and use the 85-grain Nosler Partition on deer. This bullet was specifically designed for use in the 6BR handguns and deer, and it performs very well in that role. Since most of your shooting will be with light bullets, this is a better compromise IMO. If you want to stick with bullets no heavier than 80 grains, use the 14" twist.
The 55-grain Ballistic Tip performs very well at long range with this cartridge. It shoots flatter and has less wind drift at 500 yards than the 70-grain BTip with less recoil - what's not to like?
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