Chronied the rifle with three main springs before tuning, cleaned barrel with JB bore paste.
Disassembled rifle and performed a hone and polish on the piston, compression chamber and trigger group.
Placed buttons on the piston, Apex seal and replaced the breech seal.
Tested all 3 springs again for power and firing cycle. Decided the Air Ventury main spring had the best of both areas. 820 FPS and 2 Lbs. trigger pull.
What I sent John was the Air Ventury kit from PA, HW80 spring and the Titan spring from John Knibbs
Results:
Stock spring
CPs 14.3
Low 754.00
Hi 804.3
Ave. 793.7
Titan spring
CPs 14.3
Low 844.7
Hi 852.8
Ave. 848.3
Air Ventury Kit
CPs 14.3
Low 830.9
Hi 847.7
Ave. 838.5
The hw80 spring took a pronounced set and was not used
Here is a description of the Air Ventury Pro Guide Retainer System:
The ultimate design of the Pro Guide depends on its dual Inner and outer guides to conceal vibration. This design overlays and works coaxial with the remaining sring movement, damping the TWANG at the close of the piston cycle.
my turn:
happy with the vibration, twang and firing cycle on the 48 and 840 fps is nice to have besides John worked on this 48 more than 50 hours assembling new springs and disassembling and taking notes and chrony reports
I don't know of ANY tuner that will do this for any customer and charge me what he did
warren
PS: nice job John in PA
and remember "it's 30% the gun and 70% the shooter"
the 48 has a bipod, vortec muzzel break, mount and scope and 10 onzes of lead added to the rear wood stock the 48 is balanced right in the middle of it's lenght
from a 8.5 lbs. to a monster 10 lbs. but it holds the 800ish fps like a real airgun which dampens the vibration from the 800+ fps recoil
weight is good in air guns but not good for women LOL
warren
PS: she is NOT overweight just chubby LOL again
and remember "it's 30% the gun and 70% the shooter"