So, attempting to get a couple of new rifles (both in 6.5-300) to shoot, I was limited to Wby ammo in that caliber—or so I thought. Getting pretty tight groups with the 127gr LRXs and the 140gr ABs. But a few are off, and I am noticing what I have noticed for years with Wby factory-loaded ammo: The extreme spread on the Wby-loaded groups shot over my chrono often are larger than for other manufacturers that I have come to prefer.
Particularly, in rifle ammo, I have noticed that Nosler and CorBon factory loaded ammo consistently have produced small extreme spreads.
For example, here are some recent examples from Nosler out of my 20” .308:
NOSLER Trophy Grade 168gr AB L.R.
Chrono Results: 2,613 fps, 2,615 fps, 2,616 fps, 2,609 fps, 2,612 fps = 2,613 fps avg.
NOSLER 165gr Trophy Grade AB
Chrono Results: 2,609 fps, 2,633 fps, 2,599 fps, 2,590 fps, 2,620 fps = 2,610 fps avg
Similarly, my CorBon-loaded 225gr TTSXs always come out of my .340 Wby really close to the 3,140 fps average.
I just ordered some Hendershot’s 127gr LRX loadings for the 6.5-300.
Does anyone have any experience with their factory ammo?
More generally, do some manufactures just have better/worse QC in their loading process?
How much difference can something like a 70-fps difference change the accuracy of a group?
Many thanks in advance for any answers.
