One begins with a "P" and the other with a "T"!! HA HA Ha.....Watch out Jay Leno....I'm next in line!!! But seriously, I have no idea what the difference is....so go with Mattri's answer. I do have a hunting buddy who has the Tactical for shooting P-dogs out west and he say's he may request the gun goes in his casket when he expires. That's how much he likes it as a varmit getter.
Can't say more for a caliber than that.
Dave
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