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That's certainly true, but there is a lot of bearing surface variation even in same-caliber bullets of the same weight.
Boattails reduce bearing length, as do long ogives. Flat-base roundnoses have the longest bearing surface, as a rule.
Which brings up an interesting observation: I've heard some shooters say that the .223 is fine, but its neck is too short. Doesn't hold the bullet straight or something.
But dig out a caliper and measure a standard 55FMJ military bullet and you find something interesting. The bearing length between the ogive and the boattail is SHORTER than the .223's neck length! The cartridge's neck could be a foot long, and it wouldn't hold that bullet any straighter!
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