Dahlgren.
| Denomination. | Weight. | Charge. | Weight of Shell. | Charge. |
| lbs. | ||||
| 4-inch, or 20-pounder, bronze howitzer | 1,340 | 2 lbs. cannon. | 18 lbs. | 0.86 lb. |
| 3.4-inch, or 12-pounder, bronze howitzer | 880 | 1 lb. cannon. | 11 lbs. | 0.50 lb. |
Charges for Parrott's Shell.
| 8-INCH. | 100-PDR. | 60-PDR. | 30-PDR. | 20-PDR. | ||
| lbs. oz. | lbs. oz. | lbs. oz. | lbs. oz. | lbs. oz. | ||
| Long | — | — | 3.4 | 1.8 | 1. | |
| Short | — | 3.11 | 2.2 | — | — |
Shell and Shot Gauges.
| 100-PDR. | 60-PDR. | 30-PDR. | 20-PDR. | ||
| Greatest | 6.36 | 5.27 | 4.17 | 3.64 | |
| True diameter | 6.35 | 5.26 | 4.15 | 3.63 | |
| Least | 6.33 | 5.24 | 4.14 | 3.61 |
387. In the rifle-guns of Mr. Parrott, provisionally adopted, it is intended to retain the full charge of powder which a smooth-bore gun of the same calibre would have with a round shot. The projectile for the rifled gun is to be usually ten times the weight of this charge.[38]
388. To obtain greater initial velocity, projectiles of less than the full weight have been provided—solid shot of 70 pounds for the 100-pounder, with the front end "chilled." Such projectiles, though not suited for long ranges, will be effective at 1,000 yards or less, and are well calculated to act against oblique surfaces of iron.