Shotgun; shell chamber Bore muzzle & choke tube size vs mass vs impact velocity & laws 2

all shot gun barrels have a necked down rifle bullet profile but its a stretch limo version , basically?!
&
if a 30 point constriction common choke causes 70% of the pellets to
hit in a target, a 45 point constriction turkey choke might allow 75%

0.13 mm (0.005 in) of constriction = a 75 cm (30 in) diameter pattern @ 20 m (22 yd)
0.75 mm (0.030 in) of constriction = a 75 cm (30 in) diameter pattern @ 35 m (38 yd)

UK Firearms Act Ammunition law says shotgun shells with 5 or more projectiles,
.36 inch (9 mm) in diameter or less are legal so a single projectile Slug is illegal

in the United States any firearm with a rifled barrel over 12.7 millimeters (.50 inches)
is legally considered a destructive device BUT a firearm designed to fire shotgun shells
can be converted to fire shotgun slugs with the addition of a rifleing & stay a shotgun by
barrel replacement or inserting a rifled choke tube

a 24.8 gram = 383 grain = .875 or 7/8 ounce light 12 gauge shotgun slug matches a
bird shot payload but with with a 3 to 4 inch group @ 100 yards & 400 yard max range &
a 2755 ft-lbs / 3735 joules impact at 1800 fps vs
a 2250 ft-lbs / 3051 joule impact @ 2600 fps from a 150 grain, .30-06 bullet

10 ga = 19.69 mm
12 ga = 18.53 mm
16 ga = 16.83 mm
20 ga = 15.63 mm
28 ga = 13.97 mm
.410 * = 10.41 mm 67½ gauge

416 Stainless steel barrels have a longer life than
traditional 4140 chrome/molybdenum steel barrels
10,000 psi 12 gauge 2¾ inch shell Shotgun typical
11,500 psi SAAMI max rating
35,000 psi - 60,000 psi. rifles & pistols

chokable solid british Brenneke vs
very choke able hollow tail american Foster slugs
vs smoothbore .690 inch wad slugs
vs DIY Cut shell & Wax slugs
roll vs fold crimp ?

foot lbs rating average by "bullet" type
0135,22 LR
0245,17 HMR
0324,22 WMR
0362,9mm
0420,40 S&W
0432,45 ACP
0624,357 Magnum
0901,17 Remington
1296,223 Remington
1527,7.62x39mm
1925,243 Winchester
2354,260 Remington
2719,308 Winchester
2750..