The Multi Purpose Shotgun

 Browning BPS (pump) - http://www.browning.com/ Fabarm Gold (semi-auto) - http://www.hecklerkoch-usa.com/

Chokes
Another advantage is the versatility of a choke system. A choke, the constriction of the muzzle, controls the spread of the shot and enables you to fine-tune your gun and ammunition. You can also use a rifled choke on a smoothbore barrel to take advantage of sabot-slugs and give them the necessary spin.

Browning's different chokes

P
atterns
Percentages obtained with various chokes in a 30 inch circle at 40 yards.

 Full Imp.Modified Modified Imp.Cylinder Cylinder 65-75% 55-65% 45-55% 35-45% 25-35%

• Don't choke over chokes
•

What is gauge?
Gauge is the number of spherical lead balls, with the diameter of the bore, that make 1 pound (453.6 grams).

Euh.... as you can see in the calculations below, I'm European.

 Density lead 11.35 g/cm3 pound 453.6 g volume of 1 pound 39.96 cm3 volume=4/3 * pi * r^3
So the radius of a 12 gauge (# balls = 12) equals

(39.96 / 12*(4/3)*pi)^(1/3) = 0.9264 cm

the diameter is twice the radius

d = 1.853 cm

and 2.54 cm = 1 inch

so your pipe diameter equals 1.853/2.54 = 0.729 inch

 Energy Below is a table which gives you the energy of the projectile related to its weight and velocity. Energies mentioned can be used for shot and slugs if the muzzle velocity is used.
 1000 fps 1100 fps 1200 fps 1300 fps 1400 fps 1500 fps 1600 fps 1700 fps 1800 fps 1 oz 972 1176 1400 1643 1905 2187 2489 2810 3150 1 1/4 oz 1215 1470 1750 2054 2382 2734 3111 3512 3937 1 1/2 oz 1458 1764 2100 2464 2858 3281 3733 4214 4725 1 3/4 oz 1701 2059 2450 2875 3335 3828 4355 4917 5512

 Typical velocity for 1 oz birdshot is around 1200 fps, delivering 1400 foot pounds at the muzzle. More ballistic info: Remington Ballistics Winchester Ballistics Fiocchi And because I just like graphics more then numbers here is the graph made with the numbers from the table.

 Game LEAD Shot# Choke Slug Rifled, Cyl, Imp.Cyl, Mod 000, 00, 0 Cyl, Imp.Cyl, Mod 4 - 6 Full, Extra Full 4 - 7.5 Imp.Cyl, Mod, Imp.Mod. 6 - 8 Imp.Cyl, Mod Game STEEL Shot# Choke 1 - 6 Imp.Cyl, Mod, Imp.Mod. T, BBB, BB, 1, 2 Imp.Cyl, Mod, Imp.Mod.

 Guns Since the loading of pictures takes too much time I've brought the pictures of several shotguns into another page. A few Pump Shotguns A few Semi-auto Shotguns

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Nov 04 2003