ML I got about .7 of a grain more capacity than a .17 Remington using H335 in both cases run to the juncture of the neck and shoulder for whatever that's worth.
I think the Tac has a bit longer neck as well doesn't it? Were did you start and end up with N540 and your Predator, and with which projectile?
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"Shoot safe!!"
montdoug
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