On all barrels the gauge size of the barrel shall be struck, both at the provisional and at the definitive proof.
The Scale following shows the Proportions of Gunpowder applicable under the foregoing Rules and Regulations to the Proof of the various Classes of Arms as distinguished by the Trade Numbers indicating the Calibre.
+------+------------+------------+---------++------------------++ | | | | ||Charges of Powder || |Number| Diameter | Diameter |Weight of|| for Proof. || | of | of Bore by |of Balls for|Balls for++------------------++ |Gauge.|Calculation.| Proof. | Proof. || First Class. || | | | | ++------------------++ | | | | ||Definitive Proof. || +------+------------+------------+---------++------------------++ | | inches. | inches. | grains. ||grains. ozs. drs. || | 1 | 1·669 | 1·649 | 6752 || 4812 11 ... || | 2 | 1·325 | 1·305 | 3342 || 2324 5 5 || | 3 | 1·157 | 1·107 | 2211 || 1531 3 8 || | 4 | 1·052 | 1·032 | 1649 || 1176 2 11 || | 5 | ·976 | ·956 | 1315 || 930 2 2 || | 6 | ·819 | ·899 | 1090 || 766 1 12 || | 7 | ·873 | ·853 | 931 || 656 1 8 || | 8 | ·835 | ·815 | 812 || 602 1 6 || | 9 | ·803 | ·783 | 720 || 492 1 2 || | 10 | ·775 | ·755 | 646 || 465 1 1 || | 11 | ·751 | ·731 | 586 || 437 ... 16 || | 12 | ·729 | ·709 | 535 || 437 ... 16 || | 13 | ·710 | ·690 | 493 || 410 ... 15 || | 14 | ·693 | ·673 | 457 || 383 ... 14 || | 15 | ·677 | ·657 | 425 || 383 ... 14 || | 16 | ·662 | ·642 | 399 || 369 ... 13-1/2|| | 17 | ·649 | ·629 | 374 || 369 ... 13-1/2|| | 18 | ·637 | ·617 | 352 || 342 ... 12-1/2|| | 19 | ·626 | ·606 | 334 || 301 ... 11 || | 20 | ·615 | ·595 | 316 || 273 ... 10 || | 21 | ·605 | ·585 | 300 || 273 ... 10 || | 22 | ·596 | ·576 | 287 || 246 ... 9 || | 23 | ·587 | ·567 | 274 || 246 ... 9 || | 24 | ·579 | ·559 | 262 || 232 ... 8-1/2|| | 25 | ·571 | ·551 | 251 || 232 ... 8-1/2|| | 26 | ·563 | ·543 | 242 || 232 ... 8-1/2|| | 27 | ·556 | ·536 | 231 || 232 ... 8-1/2|| | 28 | ·550 | ·530 | 223 || 232 ... 8-1/2|| | 29 | ·543 | ·523 | 214 || 205 ... 7-1/2|| | 30 | ·537 | ·517 | 207 || 205 ... 7-1/2|| | 31 | ·531 | ·511 | --- || 205 ... 7-1/2|| | 32 | ·526 | ·506 | 194 || 205 ... 7-1/2|| | 33 | ·520 | ·500 | --- || 191 ... 7 || | 34 | ·515 | ·495 | 182 || 191 ... 7 || | 35 | ·510 | ·490 | --- || 191 ... 7 || | 36 | ·506 | ·486 | 172 || 191 ... 7 || | 37 | ·501 | ·481 | --- || 191 ... 7 || | 38 | ·497 | ·477 | 162 || 178 ... 6-1/2|| | 39 | ·492 | ·472 | --- || 178 ... 6-1/2|| | 40 | ·488 | ·468 | 154 || 178 ... 6-1/2|| | 41 | ·484 | ·464 | --- || 164 ... 6 || | 42 | ·480 | ·460 | 146 || 164 ... 6 || | 43 | ·476 | ·456 | --- || 164 ... 6 || | 44 | ·473 | ·453 | 139 || 164 ... 6 || | 45 | ·469 | ·449 | --- || 150 ... 5-1/2|| | 46 | ·466 | ·446 | 133 || 150 ... 5-1/2|| | 47 | ·463 | ·443 | --- || 150 ... 5-1/2|| | 48 | ·459 | ·439 | 127 || 150 ... 5-1/2|| | 49 | ·456 | ·436 | --- || 150 ... 5-1/2|| | 50 | ·453 | ·433 | 122 || 150 ... 5-1/2|| +------+------------+------------+---------++------------------++