Power and pellet weights

by B.B. Pelletier

This report is another response to a viewer of our Airgun Academy videos. In episode 22, we say the following at 3 minutes, 20 seconds into the video, “When using real hunting pellets, you have to realize that the velocity and, therefore, the power is going to be significantly less [than the light pellets the rifle is advertised to shoot fastest].” A viewer took issue with that statement, so today I’d like to explore how airguns handle pellets of different weights.

There are three different types of airgun powerplants: pneumatics that store air under pressure and release it with the shot. This compressed air pushes the pellet and gives it it’s power. The pneumatic powerplant pushes the greatest volume of compressed air behind the pellet and, depending on design considerations, is potentially the most powerful type of airgun powerplant. read more


Air Arms S400 MPR FT: Part 4

by B.B. Pelletier

Part 1
Part 2
Part 3


The Air Arms S400 MPR FT rifle still has a surprise for us!

This special report about the Air Arms S400 MPR FT rifle was unplanned, but blog member Coax asked for it. Today will serve as the best lesson I’ve ever written on how to properly use a chronograph, because I made a huge mistake and the chronograph straightened it out for me.

Coax told me about a transfer port limiting screw that could be turned out to increase the velocity of the rifle. I was unable to locate it from his description, and we went back and forth several times before I found it. At least, I thought I’d found it. Therein lies the huge mistake I made, and the save made by the chronograph, all of which should be a good lesson in pneumanology. read more