The issue with lengthening an older gun to 2-3/4 from shorter shells, is that the shooter, (or someone after him), then reaches for those 2-3/4 uber hot loads which the gun was not designed to fire safely.
Get the right length or shorter, have the chokes opened up to what is apropos for the upland you hunt, leave the "bobbing" to those red and white plastic things in your fishing tackle box and go have fun
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