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The 180 gr 30 cal bullet is a much better choice in the whisper for deer....
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Gotta disagree here. My first T/C was a .30 Herrett in 1975, when the only good deer bullets were rounded or flat and weighed 110 grains. A 180-grain bullet will not expand at .300 velocities on deer. JD recommends the 125 Nosler BTip for the .300 Whisper on deer, and my experience supports JD's idea. I've used that bullet in three 10" T/C barrels on deer, the .30 Carbine, the .300 Whisper and the .30 Herett. The latter is the best deer cartridge IME. The .30 Carbine needs excessive pressures to get the bullet to expand past 25 yards. The Whisper works very well, but is more range-limited than the Herrett. The Herrett is the 'king .30' of 10" tubes ( although the .30-30 isn't far away).
My Whisper shoots very well, but no better than one of my Herrett barrels (the other Herrett shoots 2+ moa no matter what). It is far eaiser to make .300 cases than to make Herrett cases. But for simple fun, the .30 Carbine wins - cheap brass, carbide dies, even lower report and recoil, and it's usable on targets and small game. I shot IHMSA silhouettes with mine for years and had great results out to 220 yards with 165-grain cast bullets and RL7 powder(!).