I zeroed my rifle at 100yds for hunting with the winchester .308 150 gr PowerPoints. I then started to set my rifle up for some LR a few weeks later by switching to the federal gold medal match 168gr sierra match king bthp's. The fed gmm started grouping 8" to the left and 3" low, but it was a tight group. I thought stuff might have loosened up on me, but I threw a 150 gr power point in to see if I still had a zero for it and it hit dead center and split the cross. I have since brought the fed gmm to .5" moa and am not having any zero issues. My question is why such a huge deviation between rounds? 8" to the left and 3" low is pretty drastic. Barrel data is 24" 1-10 twist chambered in .308.
Range Report quick question about bullet deviation.
- Thread starter Kix
- Start date
Re: quick question about bullet deviation.
Barrel harmonics, velocity differences, bullet stabilization differences, and other factors or potential factors. This is a more extreme case, but zero shifting significantly between loads is not unusual.
Barrel harmonics, velocity differences, bullet stabilization differences, and other factors or potential factors. This is a more extreme case, but zero shifting significantly between loads is not unusual.
Re: quick question about bullet deviation.
Yeah, I was totally expecting a zero shift between rounds, but nothing that significant. I found it very interesting and wad wondering if anyone had some imput on why they think it was such a big shift.
Yeah, I was totally expecting a zero shift between rounds, but nothing that significant. I found it very interesting and wad wondering if anyone had some imput on why they think it was such a big shift.
Re: quick question about bullet deviation.
That my friend was a damn good read. Thanks for that link. Totally explains it. Hense the reason free floating barrels are so important. Thanks again!
That my friend was a damn good read. Thanks for that link. Totally explains it. Hense the reason free floating barrels are so important. Thanks again!
Similar threads
