Whatever the 'net' says about change in length of a rifle round not comparing to a pistol as far as pressure, is bollox from my opinion.
When I put a Wyatts box in my RUM and lengthening the bomb, I had to step my load up by over 4 grs to get back to where I was before hand.
Maybe shortening, does bugger all but longer makes a huge difference from my experience.
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