Why the 7mm some might ask? Simple, the 7mm along with the 6.5mm has some of the best and highest BC numbers. With the ADDED BC numbers of such calibers, they are a true AIDE for Air Guns. By "AIDE" I mean, they have the highest BC numbers along with LIGHT WEIGHT bullets which "AIDES" in the downrange performance due to a airguns low fps numbers. Estimated BC numbers so far after countless minutes of research is .233.
Finished barrel length on my Air Gun should be in the neighborhood of 28-30 inches. And possibly 30 inches for max fps. The barrel will be a liner from TJ Enterprises and has an internal dimension of .278 bore and .284 groove with a 9/16" outter barrel diameter. It will also have 6 lands and grooves and have a recessed target crown. More details to come later when the gun is finished. But for now...............................................
The 7mm 130 gr Soup Can bullet:
Tofazfou