Wolf Steel - at 500 yards

[SDW]

From what I understand, vertical spread can also be from an improperly used rest. Anyone else heard of that? Apparently, if shooting prone, laying on a mat is counter productive. And/or inconsistent stock-to-shoulder engagement. Anyone else hear that? I read it in here a while back:

https://www.longrangeonly.com/forum/thre...ique.1675/

And within that thread is a link to this page:

https://www.6mmbr.com/verticaltips.html