I have had a quiet a time getting this thing up to speed but now it is what I wanted. I have input data into Chairgun pro, Ballistics coefficient, ammo weight, projectile speed, zeroing distance etc. The rifle is hitting a coke can at 46 yards very nicely now.
G100 grade steel balls are a must. The rifle is shooting a 8mm steel ball at 110m/s 360fps and punching holes into tin vegetable cans at that distance, no problem. Bands are, Sheshou guru 1mm, tapered 46 to 16 mm, active band length of 138mm, 690mm draw. I use a Hawke 3-9x40 vantage.
Chairgun profile 8mm steel.
Reticle with ranges for 8mm steel at x3 magnification.