Maxim silencer and Barrel harmonics
Roger - I thought you had one. I'll dig out Harry's notes and literature on the Maxim silencer.
On the subject of barrel harmonics and the importance of sight graduations matching the ammunition. Has anyone shot MkVII ammo in a rifle graduated for Mk VI ? I remember using a .303 Martini Enfield Artillery Carbine in a 200 yard rapid fire competition - it was sighted for MkVI ammo. The target was about 44" tall, square head and shoulders with a 12" square on the chest counting as the bull. I found that with MkVII ammo I was aiming below the feet in order to hit the chest. I switched to some old Kynoch 215 grain hunting ammo (very much like MkVI) and it changed to point of aim point of impact. That is pretty much a difference of 3 feet at 200 yards - illustrating to me why it was so important to have the right ammo for rifles calibrated for MkVI - be they iron or telescopic sights.