.257 POI Shifts FIXED

Hi All,

A Month ago I asked about what COULD cause this shift problems here and on GTA forum, and have today done same with IMPROVEMENTS….I designed the NEEDED BULL BBL as the MAIN THING NEEDED. i have added a DRAWN ALUMINUM TUBE (6061) the entire length of bbl from PW to muzzle tip….1.125″ dia. tubing. On top of Carbon Fiber Sleeve. Had to take about .008″ from sleeve and the BULL BBL is entirely epoxied on and is NOW STIFF……..These 2 mods were suggested a month ago and i incorporated. Broke with heat the screw loose on air stripper, and is in towards bbl as far as will go….Added a beveled HARD RUBBER part between Tank and STOCK…Added barrel weights to help tune the harmonics…Have 8 oz on now…..Spent many thousands of rounds on Match Rimfire tunning before………Pic of bbl end of gun, shows thin barrel, Carbon Fiber sleeve and the .250″ WALL of the drawn tubing… At 100 yds after finishing, I did shoot a 6 shot .553″ group and the thing DOESN’T throw shots all over now, or shift POI.

Today my friend and i reserved the high power range, which has matches at 300, 600, 800 yd distances… I shot the NRA High Power 300 yard center, prone from 300 yds with the .257. Scored 192 of 200 points. Dropped 8 points and had 8 X’s when the wind died some… Was 3-7 mph and i got the 9’s when wind up some….But High Power use .223, 308, 6mm tube guns and 30-06 to shoot this target and feel pretty good with and AIRGUN. The 2 pasters at 9 o’clock, the one closest to the 10 ring when target turned OVER the shot clearly touches the line for a 10 count.

Then we went back to the 600 yard line… Had a bench and we set a block of wood 20 yds forward of the pit Target frame holders so would have high and low DIRT clouds to see where the elevation was…..580 yds i hit 2 clays, and my friend hit 2 also… We missed a LOT but was hitting the wood block about 16″ long by 12″ high, or right around it….Used 3200 psi on NRA TARGET and 3500 psi at 580 yds…..

The pic of me at the 600 yd firing line looks forward at the big berm which is the 300 yd firing line…The clays are beyond that into the small little looking berm into the mountain which is the pit and 600 yds….Clays are in front 20 yards lasered at 580 yds……….A LONG WAY with AIR……………I have a CF 4500 psi bottle to put on gun with a Dyotat Valve when i get another and will start the 72 gr fp supersonic just to see how far this thing will reach out there….Also how much upsetting bullet flight, getting back into the transconic zone? If i can find a place that has big DIRT/CLEARED AREA to see the impacts, i believe 800 yds is very doable… But maybe only hit a SUV at that distance, but i am going to find out…….Click Pics to enlarge…………..Carl