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Cartridge Comparisons


Twenty Caliber Cartidge Dimensions

Name Parent Body Length Diameter Angle  Neck Length OAL Capacity Notes
20-222* 222 1.2603 0.3580 23 0.3033 1.712 27.9 222 necked down with no changes
20-250* 22/250 1.5100 0.4156 28 0.2300 1.910 47.0 22/250 necked to .204
20 Bobcat 222 1.3330 0.3660 40 0.2870 1.700 27.5 .223 neck, 40' minimum taper
20 BR* 6mm BR 1.0710 0.4600 30 0.2675 1.535 37.9 6mm BR necked to .204
20 BR Impr* 6mm BR 1.1278 0.4620 40 0.3002 1.562 6mm BR improved, necked to .204
20 Classic* 30/30 1.2041 0.4090 35 0.2258 1.552 30/30 shortened, improved
20 Dasher* 6mm BR 1.1973 0.4600 40 0.2281 1.560 38.2 6mm BR improved, necked to .204
20 Duster* (1) 222 1.3350 0.3650 40 0.2510 1.670 Sharp angle, minimum taper   2933
20 Duster* (2) 222 1.4190 0.3650 40 0.2140 1.712 Sharp angle, minimum taper   5353
20 Extreme 222 1.2600 0.3480 29 0.2150 1.585 26.0 222 improved, necked, shortened
20 Mink 22 Hornet 0.8554 30 0.2290 1.145 22 Hornet necked & improved
20 Practical 223 1.4370 0.3540 23 0.2030 1.760 30.3 .223 to .20 cal
20 PPC* 6mm PPC 1.0749 0.4310 30 0.2741 1.517 33.5 6mm PPC necked to .204
20 Pup 6mm PPC 30 6mm PPC shortened .173
204 Ruger* 222 Mag 1.5346 0.3608 30 0.2173 1.863 32.4 SAAMI Standard
20 Squirrel* 22 Hornet 0.6250 0.2930 30 0.2738 0.919
20 Tactical* 223 1.4150 0.3600 30 0.2500 1.755 30.2 .223 with 30 degree shoulder
20 TNT* 17 Rem 1.3470 0.3580 23 0.2650 1.770 29.1 17 Rem necked up with no changes
20 VarTarg* 221 FB 1.0660 0.3600 30 0.2163 1.400 23.3 Sharp angle, minimum taper
20 VarTarg Turbo* 222 1.2800 0.3600 30 0.2160 1.614 29.3 Shorter, Sharp angle, minimum taper
222 Remington* 222 1.2640 0.3570 23 0.3127 1.700 28.6 SAAMI Standard

An asterisk* after the cartridge name indicates that the above dimensions have been obtained from actual reamer prints.  The others are from the best reliable sources available to me.  Remember, many of these are wildcats and therefore non-standard so the dimensions may vary.  Special thanks to the members of the Saubier small caliber forums and to Pacific Tool & Gauge for their assistance.


The 20 Duster dimensions are from PT&G prints 2933 (1) and 5353 (2).  As you can see, the dimensions are different but both are referred to as 20 Duster.

 


General Comparative Cartridge Data for Select Standardized Cartridges

Caliber  Case OAL  Water Grs  Neck Length 
17 Fireball   1.42 23.8 0.222
204 Ruger   1.85 32.4 0.2
20 Tactical   1.766 30.2 0.25
20 VarTarg   1.4 23.3 0.217
22 Hornet   1.403 14.9 0.3857
218 Bee   1.345 19.3 0.2559
221 Fireball   1.4 24.1 0.2025
222 1.7 28.6 0.3127
223 1.76 30.6 0.2027
22/250   1.92 47 0.248
243 2.045 54.8 0.2407
244 2.233 56.2 0.3508
6mm BR   1.56 39.4 0.322
257 Rob.   2.233 57.1 0.3213
257 40 degr   2.233 60.3 0.321
7mm/08   2.035 55.2 0.2842
308 2.015 55.8 0.3034
30-06   2.494 67.1 0.3854
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