It's pre-68 because no prefix letter. There is no difference in the choke taper from 1963 to present. I have a '66 Magnum, but I bought a Steel Shot barrel over 20 years ago. Remington has said #2 or smaller shot and modified or more open choke for any gun since 1950. When you have choke tubes installed, you then go by what the tube is rated for, not the barrel.
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