I found only this data on my ammo box:
Winchester 180gr JHP
VV N105 12,2gr
CCI 300 LP
1286 fps 2010/Oct 12 @ 12°C / 54°F (stock barrel)
1303 fps 2011/Jun ? @ 25°C / 77°F (stock barrel)
1331 fps 2011/Jun ? @ 25°C / 77°F (custom IGB barrel)
so if I had shot both times with the same barrel (it was stock b. I did so) it would be approx. 20 fps difference, but it's also only 13°C /23°F difference in temperature.
It's my own ammo from the same batch.
On that day (2010/Oct 12 ) I also compared speed of Winchester JHP and Hornady XTP bullets, both 180gr:
Load: N105 12,4gr w. CCI 300
Winchester JHP: 1291 fps
Hornady XTP: 1282 fps
Load: N105 12,6gr w. CCI 300
Winchester JHP: 1300 fps
Hornady XTP: 1297 fps
each is the average of 3 rounds from my Glock 20, stock barrel.
I hope it helps somehow.
Better be judged by twelve than carried by six.
Last edited by robert91922; 07-17-2011 at 14:05..