Re: .22LR test- results UPDATED 12-27-08
7-12-09
tested five kinds of ammo today. shooting procedures are in OP, conditions are as follows:
85 deg outside temp
wind light and varible <5MPH
shooting notes
as per my usualt procedure i started with a "calibration test" with federal gold medal match to baseline my numbers. the high heat compared to the other tests created a 50-60 FPS increase in FPS numbers, therefore all FPS numbers will be at a -50 FPS correction and will be noted as such. no change in accuracy was noted.
CCI SHORT
29 Gr copper plated LRN
average group size 1.56"
velocity
factory spec 1105 FPS
average 10 rd string 1124 (-50 FPS correction)
low 1110 high 1151 (-50 FPS correction)
notes
Sweet smokey smell when firing. lots of unburned powder in the barrel.
cost 4.95/100
CCI CB
29 grn LRN
average group size 2.05"
velocity
factory spec 710 FPS
average 10rd string 730 FPS (-50 FPS correction)
low 710 high 749 (-50 FPS correction)
notes
virtually silent in shooting. the hammer falling made more noise than the shot. minimal residue for a low velocity round like this.
cost 8.99/100
WINCHESTER POWER POINT
40 grn plated HP with luballoy coating
average group size 1.15"
velocity
factory spec 1280 FPS
average 10 rd string 1275 FPS (-50 FPS correction)
low 1269 high 1280 (-50 FPS correction)
notes
very tight velocity window helps make for excellent accuracy on this round. clean shooting, smooth ejection. noted that bullet tips were uneven and HP cavities were not identical from bullet to bullet.
cost 1.99/50
CENTURION RIMFIRE
40 gr LRN
average group size 1.95"
velocity
factory spec 1250 FPS
average 10 rd string 1224 (-50 FPS correction)
low 1186 high 1278 (-50 FPS correction)
notes
very inconsistent from round to round. Shot consistenly at least 6" off point of aim. large velocity window. VERY stinky and smoky. left lots of debris in the bore including a fibrous material that disintigrated when i touched it.
cost 2.35/50
WINCHESTER "333" BULK PACK
36 gr Plated lead HP
average group size 1.85"
velocity
factory spec 1280 FPS
average 10 rd string 1203 FPS (-50 FPS correction)
low 1178 hihg 1265 (-50 FPS correction)
notes
this ammo had a dark, thin coating on teh bullet that almost feels like a moly coat. the HP cavities were also very uneven from bullet to bullet.
cost 11.95/333
SW