Ignore the cannelure with impunity. Bullets have cannelures for at least two reasons, neither of which applies to all loads:
<br>-- for crimping the mouth of a specific cartridge (the .350 Remington is one example), not for other cartridges of the same caliber (.35 Remington, Winchester, and Whelen, .358 Winchester and Norma Magnum, for example)
<br>-- to control the expansion of the bullet and the jacket splits that permit the expansion
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<br>One-caliber seating is A minimum -- not THE minimum, not optimum.
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<br>Other things determine optimum seating depth
<br>-- free bullet travel
<br>-- magazine length
<br>-- neck length
<br>-- base of bullet a tad (0.050 inch or so) forward of the base of the nect
