This is because the propellant burns at high temperatures, which may burn plastic. So you may be wondering why it has a plastic case while most bullets have a metallic case. This is because most of the action takes place in the metallic section.
The plastic only holds the other materials together. This plastic case has crimps or rolled turnovers which open up to release the shot. The primer is the device that ignites the propellant. Primers burn at different temperatures. So the loader needs to use the right primer with the appropriate propellant for it to be effective.
For instance, a primer that ignites fast and at higher temperatures works best. This is the material that burns, sending the shots down the barrel. Black powder was the only propellant in most cartridges for a very long time. This is because black powder burns slowly, and most rifles had long barrels.
Lighter loads have single-based nitro powders that burn faster. On the other hand, heavier loads have a double base powder, which is granular. The propellant has rapid gaseous expansion when set off by the primer. That gaseous expansion works to place pressure on the wad. The wad is the part that separates the shots from the propellant. Currently, more wads are made from fiber since plastic is non-biodegradable. The wad prevents the shots from melting due to high temperatures.
Plastic wads have petals which expand upon firing. In a hammergun , the tumbler and hammer are separate parts.
Another example of the different terminology used is the projecting part of the fore-end iron to which the fore-end wood is fitted. Stale as in broom stale is how a born-and-bred Brummie would pronounce steel, or at least that is how it would sound to an outsider. Word of mouth was the means by which many terms were passed on from one individual to another — which could also have added to the regional differences of course.
Similarly, with break-open shotguns the main steel parts are the barrels, action body or just body and fore-end iron. The long steel, or stale, secures not only the fore-end wood but is also important in having some sort of catch to hold the fore-end in place. Most of the make-up of a sidelock is the same as a boxlock; the main difference is the lockwork fitted to plates on each side making it a direct descendant of the hammergun, but with the hammers inside.
The handsomely decorated sideplates on a Bettinsoli conceal a standard Italian boxlock action. A sidelock can be a bar lock, where the front of the lockplate carrying the mainspring fits into a cut-out in the bar of the action body. There are also bar-lock sidelocks with rear acting mainsprings and back-action sidelocks where the locks are fitted behind the action body.
Shotgun barrels have ribs. On a side-by-side shotgun these will be top and bottom, on an over-and-under, top and side ribs.
Purdey side-by-side shotgun with 30in barrels featuring a game rib. The small catch that holds the fore-end in place is a fore-end loop , though it bears no resemblance to any such thing, but is a word left over from muzzle-loader days when it did look more like a loop. Mobile Newsletter banner close. Mobile Newsletter chat close. Mobile Newsletter chat dots. Mobile Newsletter chat avatar. Mobile Newsletter chat subscribe. Winchester gauge Super X2. See more gun pictures. Photo courtesy Shotgun World.
0コメント