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Doesn't matter much how long the throat is from case mouth to start of the leade as long as the ammo's pretty straight.
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Better talk any number of benchrest shooters.
It also is a well known way of reducing peak pressure (556 & Weatheerby's goal in using it).
Adjusting jump to the leade can have a significant effect on accuracy in some rifles, not so much in others (they probably have so many other problems it does not matter).