Of course, very few of the people commenting here have used by far the the finest cartridge in this class, the B-29. If they had, all this blathering about the .270, .280 and "improving" would disappear, due to the obvious superiority of .29 caliber.
Unfortunately, the B-29 is so good it was apparently suppressed, probably by the Obama administration, perhaps through BATFE agents on another "secret" mission to disarm the American people.
Speaking of Blathering :
Was this mythifictitious Bravo-Two-Niner based upon the RSAUM case ?
I assume it was best served by a Full Gainer Twist...
