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Old March 26, 2005, 11:54 PM   #2
Art Eatman
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Join Date: November 13, 1998
Location: Terlingua, TX, USA
Posts: 22,526
Both Hodgdon and Speer show 51.0 as max, so you're okay there. Large rifle, but not magnum primers, of course.

I dunno. You using a scale, or a powder measure? Maybe there's some sort of inconsistency in your weighing/measuring?

Variations in pressure can result in variations in barrel vibration, which can open up a group considerably. High, low, sideways...

My only loading of a .270 was eons ago, with a caseful of the old-style surplus 4831 compressed under a 130-grain bullet. Gave around 2,700 ft/sec or thereabouts. So, never any signs of high pressure...

Art
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