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This so-called "rule" was dreamt up by the late Cal Pappas after one of his rifles regulated with a lighter bullet and a reduced charge of propellant. It may or may not work in a given rifle. It certainly doesn't work in my .450 NE or in any of the double rifles owned by friends who have tried it. A rule it aint, not by any stretch of the imagination.

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Cal didn't really dream it up.
What we call the 75% rule today was employed by Holland & Holland in their 500/450 magnum.

We discussed this topic a little in the past:

http://forums.nitroexpress.com/showflat....true#Post245663

On another thread I said:

"...when Holland & Holland touted the accuracy of their 500/450 nitro all of the superior groups were shot using their 365gr bullet in rifles very likely regulated for the 480gr bullet.
And that, gentlemen, is where the much lauded (and believed to be modern) idea of the 75% rule came from."

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He who lives in the past is doomed to enjoy it.

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