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Well I know this topic is a few months old, but here is my quesion.
I too have one of those wonderful mini-mauser actioned rifles, and have been trying the Sierra "303 British" .311 dia. 150gr sp bullets to develop an accurate load. In my quest for information, someone mentioned using Greenhill's formula to find the optimal bullet length of bullet for the rifle. I determined with the manufacturers website and using the old measuring the cleaning rod meathod that my barrel has a 9in twist. According to Greenhill's formula, a 9in twist with velocities under 2800 requires a bullet with an approx. length of 1.5''. The closest thing i have found that meets that requirement so far is Sierra's 303 british 174gr. HPBT. It has an overall legnth of 1.22''. Has anyone tried to develope a load off of this projectile?
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