pellet seating

[send2r]

 what is the correct seating of the pellet?

i found a writing pen that had big rounded point at the top of the pen. which when is placed on the skirt of the pellet when the  pellet is in the receiver. when you push u can feel a click the pellet is about a 1/16 maybe less below the receiver plane or face accuracy improved dramatically.

since the pen is made of plastic and not intend for this use it will not last
so i was wondering would getting a brass rod and preparing the end to work like pen. is that a good idea? placing the pellet that far down the receiver and brass against receiver face.

[rsterne]

From your description, I assume you are talking about a springer.... You will likely find that the deeper you seat the pellet, the lower the velocity and the rougher the shot cycle.... This is due to the increased volume lowering the peak pressure between the piston and the pellet....

If the tool you are using is flaring the skirt of the pellet, however, that may not occur....

Bob

[send2r]

hey rsterne thanks for the quick reply
could you explain a little more about rougher the shot cycle?

npxl 1100

[rsterne]

In normal operation, the piston in a springer compresses the air in the chamber to a high level and about the time the pellet starts to move (depending on pellet weight) it rebounds of the cushion of air without hitting the end of the chamber.... That is the "reverse recoil" that makes springers tricky to shoot because the gun starts dancing around before the pellet has left the barrel.... Then the piston reverses again, and come to rest (relatively gently) against the end of the chamber.... If the pellet is too light, it starts to move too soon, and the piston crashes into the end of the chamber.... If the pellet is too heavy, the pressure and temperature can go so high as to make the gun diesel, driving the piston back with considerable force, which can damage the spring, and may in severe cases even re-cock the rifle.... Seating the pellet deeper reduces the peak pressure, just as if you used too light a pellet.... It may also collapse the skirt, which is normally flared out into the rifling by the initial high pressure pulse.... That can allow some blow-by, increasing the problem.... If you flare the skirt without pushing the pellet deeper, you may actually increase the initial resistance to motion and increase the pressure (and velocity)....

Pellet seating and flaring together does have one advantage, at least in theory.... It should help eliminate the slight variations between pellets.... which may improve accuracy.... Just don't go too deep....

Bob

[send2r]

wow ok thanks bob for the reply  that is a lot to think about.