Name:

18.59x70mmR

Manufacturer:

various

Also Known As:

"12 Gauge"

Bullet Type:

Magnum 00 Buckshot (12 Pellets)

Bullet Diameter:

.33 inches each

Bullet Mass:

4g each (48g total)

Charge Mass:

1.69g

Round Mass:

63.5g

Standard Muzzel Velocity:

1325 feet/sec. with 50.8cm barrel

Packaging:

25 rounds per carton, 20 cartons per wooden case

Package Mass:

39.91kg

Comments:

This is the most popular shotgun round in the United States and the most common size of shotgun shell in the world. Available in a wide variety of of loads, there is also an all bras casing version available (listed below). The all brass case makes for a very waterproof round and except for the weight, the best available combat round. The Magnum 00 Buckshot round is the standard Morrow Project issue. The "Teleshot" round was developed in 1968 during the Vietnam War. The round uses an expanding steel capsule to push the pellets and retain the propellant gases. Since no gas leaves the barrel, there is no effective noise from the firing of the shell. Because the pellets are not pushed by gas but by the expanding capsule, the barrel length of the firing weapon has no effect on the muzzel velocity of the pellets.

The most common size of 12 gauge shell is 2 3/4 inch (18.5x70mmR). There are also 2 1/3 inch rounds (18.5x59mmR) and 3 inch rounds (18.5x76mmR)

Shot
Number	Diameter	Approx. Pellets per oz.	Pellet Mass	Approx. Pellets per shell
9	.08 inches	585		730
7.5	.095 inches	350		437
6	.11 inches	225		278
5	.12 inches	170		215
4	.13 inches	135		170
2	.15 inches	90		110
BB	.18 inches	50		63
Buckshot
Number	Diameter	Approx. Pellets per lbs.	Pellet Mass	Approx. Pellets per shell
4	.24 inches	340	1.3g	27
3	.25 inches	300		20
1	.30 inches	175		16 (20 magnum)
0	.32 inches	145		12
00	.33 inches	130	4g	9 (12 magnum)

Used in:

M870 - M10A - Atchisson

Other Loadings:

Type	Bullet Mass	Round Mass	Muzzel Velocity	Effective Range
M274 #4 Buckshot (27 pellets) paper or plastic case	35.1g	50.6g	1335 feet/sec. 76cm barrel
Standard 00 Buckshot (9 pellets), paper case	36g	51.5g	1325 feet/sec. 76cm barrel
Standard 00 Buckshot (9 pellets), brass case	36g	60.5g	1125 feet/sec. 50.8cm barrel
Magnum 00 Buckshot (12 pellets), plastic case	48g	63.5g	1325 feet/sec. 76cm barrel
#4 Buckshot Teleshot (silent round)	15.6g		450 feet/sec.	20m

Bibliograhpy:

TM 1-1 and Armory

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Last updated on: 21-Oct-1999