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Old December 12, 2019, 12:56 AM   #50
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Join Date: January 7, 2008
Posts: 3,068
Well, we know what we know, and often-times what we think we know is based upon the limitations of our own experience. The standard rifling twist rate for the 270 Winchester is one turn in ten inches and the caliber was originally intended for 130 grain bullets.
My current 270 shoots most everything into about 1-1/2 inches for 5 shots at 100 yards, maybe 1-1/4" at best. At 300 yards all of the most promising hundred-yard recipes have destabilized into 10" or 12" or 16" groups. Why don't I get rid of it?
Well, one of those unremarkable 1-1/2" hundred yard recipes does something funny at 300 yards.... 5 shots into 2-3/8" to 2-1/2".... I'm not entirely sure why this one load shoots sub-minute of angle at 300 when it won't at 100, but I'm happy with it.
The bullet is 150 grain Nosler Partition driven by enough Norma N-205 powder to hover right around 3,000 fps. This powder is long discontinued, what, 40 odd years ago? One of my goals is to work up an otherwise identical load using Norma MRP to see if I can duplicate the performance that I get with N-205, since I have a limited supply of it.
I've shot this over a chronograph against another fellows 7mm Remington Magnum and it left me wondering why one would sacrifice magazine capacity for a 7mm magnum that can easily be matched by a hand-loaded 270 or 30-'06. Of course, you could handload that 7mm magnum too, and finally get what you paid for.
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