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It's a personal choice in my opinion. I haven't done a speed lock in the last 35 years.... I moved on to more accurate actions.
If you wish to wring the most in accuracy out of a 98 and you are re-barreling it, that might be a good thing to do. On a factory 98 I doubt you would measure any difference in accuracy.
From reading the link you put up, I find it interesting how these guys document speed. If these numbers are correct, and I'd have no reason not to believe they are, then it's something that has a certain degree of value.
Like the previous post, in terms of seeing tremendous accuracy gains, this probably isn't one of them. I'd compare this upgrade to upgrading sparkplug wires vs a stroker kit.
I think the action is a 98 Mauser. long slow stroke. Would not a speed lock be of more value in a hunting type rifle (off hand shooting) vs a benched rifle?
Seems to me that when we used to use mausers for target rifles they had shortened strokes and heavier springs. It was lipstick on a pig, but it needed all the help it could get.
Would not this change make more sense on a hunting rifle than a target rifle?