I plan on taking my Security Six out this year, which XTP do you like better, the 180 or the 158 for Whitetail?
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I really depends, if you reload and barrel lengnth.
If that Security Six has a 6in barrel and you load them fairly hot I would go with the 180grn.
The 158grn is still a good choice, the XTP will hold together pretty good.
Whichever that Ruger shoots best is what it prolly would come down to for me.