Based on nothing other than my own sense of logic, I would say that the rifling on the left would create higher chamber pressure. Since its rifling has a larger total surface area, it will displace more jacketing marterial. This would, it seems to me anyway, create more resistance and thus higher chamber pressure.
I have also always wondered if the difference in various rifling configurations engraved in the bullet makes any aerodynamic difference in the bullets. ie do more grooves create more resistance or is it minimized by the major shock wave that comes off the nose of the bullet, as in the picture below.
Surely surely some of the engineering types on this sight could help provide answers.
I have no scientific backround, but I did stay in a Holiday Inn Express a couple of weeks ago.
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