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Alan Alford's build

2250b Tube for later move to bulk CO2.
12" .22 Caliber Barrel from Doomsday Backpacker
Brian & Assoc. Alluminum Breech with 2 barrel screws
Original site rear
Pin site on Custom Mt. Airguns Muzzle Break
2x1 Centerpoint Scope with UTG dovetail adapters
Mountain Airguns Custom Bolt and Handle
Mountain Airguns Custom Power Adapter and spring guide
B&A Boss Valve for extra Power

Built mainly for fun and to shoot at local Field Trial Pistol Match.

It currently it shoots a 14.3 Crosman Hunting Pellet at about 530 fps in a 72 degree room for 8.92 FPE.



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A couple of comments, just for grins.

June 14 2012 at 9:50 AM

Steve in NC  (Login pneuguy)
Troll, Banned User or Assorted Delinquent
from IP address 98.69.198.150


Response to That was one of the arguments proposed....

1. The molecular velocity stat' most likely to be relevant is, not the average velocity, but the RMS velocity, since this is the one that corresponds to average kinetic energy.

2. An air temperature of 40C = 104F produces an RMS velocity of 519m/s = 1703fps, and air reservoirs are often this warm (or even far warmer) after a recent fill.

http://hyperphysics.phy-astr.gsu.edu/hbase/kinetic/kintem.html

3. There are many ways to inadvertently perturb the calibration of the readings from a Shootin' Chrony chronograph by 6% (or more), and 1750/1650 = 1.06.

[linked image]

Steve


    
This message has been edited by pneuguy from IP address 98.69.198.150 on Jun 14, 2012 9:54 AM


 
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