Lots of experience with Barnes X and TSX here. Great bullet. If I could use 223 caliber for deer that would be my choice. You still have to hit them where they live and avoid raking shots with such a light bullet. As for seating length, start between .030 and .050 off lands. Unlike most other bullets, that are not made of all copper,they like a bit of a running start into the barrel to get best accuracy. The reason is that they are harder than lead bullets so setting them close can cause pressure spikes due to the minor differences in the shape of the tip from bullet to bullet. (This is not exclusive to TSX) The pressure spikes are not dangerous, just not conducive to best accuracy. Check out the Barnes web site for more info on same.
