this gun, was intended for use with 221 Fireball cases, which are nominally ¹⁵⁄₁₀₀₀ inch shorter. I wonder if the fi reformed 17 Fireball cases that generated excessive pressure might have been on the long side after fi reforming and therefore might have trapped the bullets enough to raise pressure. Case length measurements support this possibility. I do know that, henceforth, I will not be testing loads that generate more than a couple of ten-thousandths inch case head expansion when fi red in once-fi red (fi reformed) cases. Of course, 17-caliber chamberings are notoriously


Custom 17/23 SMc dies: Full-length sizing, made using my resizing die reamer, this die will reduce the body only enough to allow free chambering; Custom Lee Neck-Sizing Collet, made to properly resize only the neck; Custom RCBS Gold Medal seating die and extended shellholder, to ease and perfect bullet seating.


expansion was suffi cient to ruin the case. These pressure excursions resulted in blown primers and took the fun out of that testing! Reducing test charges to the level reported here is the solution. I have no good explanation for those pressure excur-


sions but I wonder if the use of the longer 17 Fireball cases might be an issue. The original reamer, as used in chambering


sensitive to small changes in charge weight. Perhaps this is all that was going on here – we were in a hurry and did not practice precision charge weighing for these test loads. In any case, I believe that the loads listed here will be perfectly safe and reasonable in the test gun and that such loads will not lead to short case life. However, I would strongly sug- gest starting with 2 grains less propellant for loads used in any other gun (made with the new reamer design) and I would expect maximum loads with naked bullets to be at least one-half grain less than maximum loads using properly moly-plated bullets. Accuracy was hard to measure because the gun came


back wearing a lightweight Savage injection-molded stock that I fi tted for Williamson because he wanted to use this gun for walkabout varminting. That stock tended to stick and jump around in my front rest. Watching the crosshairs on the target was quite entertaining. I could not get the gun to settle into the bag and to recoil consistently, as evidenced


IGT™


(INERT GAS TECHNOLOGY) USES PNEUMATIC INERT GAS CYLINDER INSTEAD OF A SPRING!





Integrated noise dampener


LESS VIBRATION


With the use of the pneumatic cylinder vibration is reduced in relation to traditional spring technology.


Page 70


MORE PRECISION


High Accuracy due to the IGT™ and the recoil pad with up to 74% absorbing pressure.


October — December 2011


EXTREMELY DURABLE


The IGT™ is more durable than spring technology and is able to keep a consistent power over time.


STEADY AND


CONSISTENT POWER


The pneumatic cylinder is always propelling the same power to the pellet.


CONSTANT & SMOOTH COCKING EFFORT


The cocking effort is moreconstant and smooth as thereis no spring friction.


MORE VELOCITY AND TERMINAL PENETRATION


Up to 1300 fps in .177 with PBA® Platinum ammunition (included)


1300 FPS


with PBA ® Platinum


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