look for a used 24" M1 benelli w/ ribbed vent barrel..
Why a 24" and vent ribbed?
Mossberg 930 SPX is a decent choice for an auto gun on that budget, and have money left over for ammo/accessories. But the mentioned FN SLP is probably even better, if it's found within the budget - excellent choice, IMO.
http://www.google.com/search?q=fn+s...4QrQQwAA&biw=1659&bih=842&fp=e18ec2db23988f7d
http://www.google.com/search?q=moss...n&tab=wf&biw=1659&bih=842&fp=e18ec2db23988f7d
Practice like you play. Forget the 24", IMO. Only reason for those is gamesmanship, to extend the mag tube. Unless you're REALLY gonna use the 24" for home defense (which is terrible for going around corners), then forget it and run with an 18-19" with a full length mag. Practice like you play (i.e. fight).
Ok, quick tally; how many folks that replied to this question thus far have even shot a three gun or a similar competitive shotgun match?
I know of three including myself.
To answer you, firecop, the 21"
Benelli ribbed barrels are most optimal but my recommendation was made in lieu of the op's budget.
Ribbed barrels are faster sighting than any other type or front/rear sights and work well when shooting typical 3gun targets.
They are accurate enough to get me fist sized groups with slugs at 75yds.
As far as the gamesmanship comment; it sounds very "internet gunboard anecdotal". My 3gun benelli is my duty shotgun and it holds 9 rounds in "cruiser ready" condition.
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