I have a Ruger that's 100fps slower than my Rem so far in my testing. Have two Tikka's that are clocking the box velocities of a factory rd, happy with the velocities of a reload in them. Any mfgr can have a slow barrel, it happens, even with custom barrels, .0002 +/- here, .001 there, .003 there, can make for a fast or slow one, all according to tolerances and tooling used in making bbl's and chambers. Along with the fact that factories change powders and don't tell anyone, and don't change their box to read to suit.
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