A lot depends on the length of your barrel. A 10" 6.5 TCU has pretty low velocities with any bullet and would need a light, soft bullet to insure expansion. Even the BTips stop expanding much above bullet diameter around 1800 fps. A 14" barrel has 100-150 fps more velocity and will give more positive expansion. Wet newspaper is not a very good indicator of bullet expansion; compare the resistance of a solid foot of wet paper to the lung tissue of a deer....

Don't be afraid to use 100-grain BTips on deer, I use that bullet in my .260 at rifle velocities and it penetrates well with excellent expansion. Slowed down 1000 fps it would only penetrate and hold together even better. The 120 BTip would be fine in a 14" barrel. Heavier bullets are probably not a good idea due to their low velocitiy. Use bullet construction (Partition, X-bullet, etc.) to enhance penetration, not bullet weight - this is the 21st Century, not the 19th!

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