OK, let me start off by stating I’m thought of by most as a down to earth, practical lad. I say that because what I’m about to post will cause many to see me as living life on the edge of sanity. So here we go! I have a custom 257 Roberts (not an AI) built on a pre-64 action. To it is screwed a 23” Krieger barrel. The stock an older Pacific Research fiberglass stock. Optic is a Leupold FX 11 6x36 scope in S&K mounts.
Now the interesting part. With a load of IMR4831 beneath a 115 grain Nosler Partition, in Remington and using Federal 210 primers I’m getting 3180 FPS as measured by an older chronograph AND by a new radar chronograph.
No sticky bolt, no pancake primers at all!
I’m not reporting the powder amount, but it’s north of the Nosler manual and a grain more than Finn Aagaard reported in his excellent book,”Hunting Rifles & Cartridges”.(See page 109)
Contrary to what the above may lead you to believe, my goal is never to wring out the last 10 feet of velocity of velocity in any load; but this time it appears I certainly have.
