Tuning w/out Chronograph: Tips and Suggestions
After spending a good deal of money on an AF Condor, pump, rings, ammo, etc. etc. I do not feel like spending another +/-$100 on another item like a chrony. MidwayUSA has some great deals going and eventually I will purchase one, but not right this second.
From those of you who have been through this, to those of us who will go through this, what tips do ya’ll have for initially getting our PCP’s ADEQUATELY tuned with no chrony?
I anticipate setting up @50 yards, fill to 3,000 PSI and shoot until a see significant drop in POI then record shot count and ending PSI.
Other than this method, are there any sage PCP’ers tips out there?
(I have 2,500 Crossman Premier .22CAL Domed Pellets on there way from BassPRo w/ gift card so I should have enough plinking ammo to tinker with.)
Thanks guys! :4:
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You need a chrony. Don’t alter your gun without knowing exactly what each individual change has done to your fps or you will forever lose your way. Tuning without a chrony will cost you more in the long run.
I think you can make use of chairgun, as well, using their pellet database for your pellets, the pellet drop diagram and the muzzle speed setting.
I explain my idea:
You could shoot the same pellet with the same pressure at different distances, (e.g. 3 shot group starting from 3000 psi at 60 yards, then 3 shot group starting from 3000 psi at 40 yards, then 3 shot group starting from 3000 psi at 20 yards), measure the difference in impact height and then experiment a little in Chairgun with the fps settings in order to have the drop diagram matching your measurement.
Sure no precise science, but gives you an indication of your rifle’s power at 3000 psi.
Then you do the same with the same pellet at the same distances with another start pressure (e.g. 2800 psi, 2600 psi, 2400 psi and so on…).
Of course, you can shot 5-shot groups if you like or use different distances.
Cheers
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Try soft chrony, you can download it here on talon