Shotgun Cartridges, by Calibre and Loading

Gauge	Bore	Chamber ID		Chamber		Rim Recess			Nominal		Wad
or	ID	Front	Rear	Length		OD	Depth	Rad	Load		Dia
No.	'F' "	'C' "	'B' "	'E' "	mm*	'A' "	'D' "	'R' "	Oz	Grams	Inches
4	0.935	1.035	1.090	4.00	-	1.200	0.130	0.030	4	114	0.948
8	0.835	0.914	0.930	3.25	80	1.035	0.115	0.020	2	57	0.845
10	0.775	0.845	0.861	3.25	80	0.933	0.074	0.020	-		0.784
10	0.775	0.845	0.859	2.875	75	0.933	0.074	0.020	1.4375	41	0.784
10	0.775	0.845	-	2.625	65	0.933	0.074	0.020	1.3125	37	0.784
12	0.729	0.800	0.815	3.00	75	0.886	0.074	0.020	1.625	46	0.738
12	0.729	0.800	0.813	2.75	70	0.886	0.074	0.020	1.5	42.5	0.738
12	0.729	0.800	0.812	2.50	65	0.886	0.074	0.020	1.0625	30	0.738
12	0.729	0.800	?	2.00	50	0.886	0.074	0.020	0.875	25	0.738
14	0.693	0.763	0.775	2.560	65	0.847	0.068	0.020	x	x	0.702
16	0.662	0.732	0.745	2.75	70	0.815	0.062	0.020	1.125	32	0.671
16	0.662	0.732	0.744	2.560	65	0.815	0.062	0.020	0.9375	26.5	0.671
20	0.615	0.685	0.698	2.75	70	0.766	0.060	0.020	1.00	28.5	0.623
20	0.615	0.685	0.698	2.560	65	0.766	0.060	0.020	0.8125	23	0.623
24	0.579	0.649	0.661	2.50	65	0.728	0.060	0.020	-		0.587
28	0.550	0.614	0.626	2.50	65	0.688	0.060	0.020	0.5625	16	0.557
32	0.502	0.562	0.574	2.50	65	0.636	0.060	0.015	-		0.509
67	0.410	0.465	-	3.00	75	0.537	0.060	0.015	0.625	18	0.415
67	0.410	0.465	-	2.50	65	0.537	0.060	0.015	0.4375	12.5	0.415
67	0.410	0.465	0.475	2.00	50	0.537	0.060	0.015	0.3125	9	0.415
No 3	0.360	0.415	0.424	1.75	-	0.479	0.050	0.015	-		0.363

To be pedantic, The bore relating to 67 gauge should be 0.411", however the use of 67 in respect of the .410 is relatively common and falls within the allowable tolerance.

I also have had numerous ideas, that for various reasons have not been acted upon. I include them in these pages in the hope that they may inspire others to pursue and develop them.

The Greener calibre is actually a bottle necked metallic cartridge that uses crimp closure, but it is included here as it is (was) a special 'Police' shotgun that is basically a single shot Martini action shotgun with a higher than normal service pressure. (believed to be 8 tons / sq")

Conversely there are some shot loadings among the metallic rifle and pistol calibres.

I have always had a personal fancy for the 28 gauge, I have never owned one, but I would like to try a side by side 25" with "Churchill" type rib (boxlock or sidelock). I think the speed of handling coupled with a rearward balance would produce lightening handleability.

Shotgun Cartridges, by Calibre and Loading

Written... Spring 2001, Revised... 08 July 2001, Revised... 18 to 21 December 2002, Revised... 17 October 2003, New Domain... 13 February 2004, Upgraded... 17 January 2007, revised... 16 August 2007, Code Altered... 18 May 2008,