Back bored shotguns win almost all competition shoots in shotgun sports. Those guys you admire at the trap lanes who just seem to never miss, on hot days will drag out their biggest bored guns, some of these guns are bored 10 gauge bore diameter, these big bored guns need the wads to be warm in order for them to expand and seal the bore, additionally these guns have extremely short shot strings and throw up a wall of shot at clay birds.

 Boring a 12 gauge shotgun to 10 gauge bore diameter is just a bit to much because the gun will not be consistent it can only be shot on warm, hot days.

 The reason for boring a shotgun is simple it shortens the shot string which is the time frame from first pellet impact to last pellet impact.

 If your going to compete in shotgun sports, its not what you spend for your shotgun, it's how much you will spend on it to make it competitive and this would include going to a gunsmith to have the shotgun fitted to you.

 For all competition shotguns in the 12 gauge class.
 (a.) Barrel Length: 30"
 (b.) Chamber length: 2.750"
 (c.) Bore Diameter: Minimum .735 / Ideal All Weather .740
 (d.) Chamber to bore forcing cone length: 1-1/2"
 (e.) Bore finish: 600 wet finish - then burnished with 0000 steel wool.

 Chokes
 With all this extra bore work how does this affect choke tubes, simply put, they will work better.

 Hunting
 If you hunt upland game birds with this same gun that has been altered, you will find that you will be taking more game home. This same gun with different choke tubes becomes a real game getter.

 Factory Guns:
 Once again winchester steps up to the plate to score another first in the factory gun class by offering their new sporting clays gun featuring factory back bored, ported barrels.

 Model 101 Pigeon Grade Trap Adjustable Comb.
  These deluxe trap guns dominate the field with sought-after extras straight from the box.
 Advantage 1: A wide 10mm steel runway rib, mid-bead sight and TRUGLO® TRU-BEAD® interchangeable fiber-optic front sight offer a truer, more technical sight picture.
 Advantage 2: The lightweight barrels are highly polished and feature porting and vented side ribs.
 Advantage 3: An adjustable trigger shoe fine tunes length of pull.
 Advantage 4: Available with 30" or 32" barrels.
 Advantage 5: It features the Invector-Plus™ choke system and .742" Back-Bored Technology that is world renowned for ideal shot patterns.

 Why 30" barrels?
 The reason for 30" barrels is to help shooters get on target with a longer sight plane even though this is creating a very long shot string but then this is the reason for the back bored barrels is to help shorten the shot string.

 Why the wide rib?
 The reason for the wide rib is it gives you more platform to sit a clay bird on, all of my bird hunting guns have wide flat ribs with no bead sights installed, for me the bead sights just get in the way of the sight picture.