In general, 2-groove barrels and 6-groove barrels outshoot 4-groove barrels all-day-long. I don't know why there are so many four groove barrels. 
I used to think 6 groove barrels were magical. But, Springfield Inc. barrels made in Genesco IL were made in, what?, the sixties? So of course they are in good shape and accurate. People hate all things Genesco(or at least, used to), but I will snatch up a six groove Genesco barrel in a heartbeat. In a heartbeat.
This discussion of Medford barrels and 5-groove barrels is fascinating. The first I've heard of grooves negating corrosive power et,el.
Last edited by dryheat; 01-12-2017 at 08:57.
If I should die before I wake...great,a little more sleep.
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