The question I would ask is does a longer bearing surface make the rifle more forgiving of poor bullet alignment? There are rumours that round nose bullets can be more accurate. Is that due to centre of mass/centre of form or longer bearing surface? The most accurate bullet I have tried is a 45gr Super-X 218 Bee bullet. It is a round nose hollow point and is quite short. It out shot the Hornady match bullets I was using in my mini-14. 3/4 MOA against 1 MOA groups out of a mini-14! The Hornady bullet has a longer bearing surface but the bearing surface to bullet length ratio is less than the 218 Bee.
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Regards
303Guy
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