pianoman 3,587 Posted February 25, 2015 Report Share Posted February 25, 2015 Also checking against scope-cant . If your scope reticle is not truly vertical on your rifle's action, you will find you can zero the barrel and scope nicely at one set-range but, the shots will then, hit out of zero and miss at greater distances. 1 Quote Link to post
GaryC 9 Posted February 25, 2015 Report Share Posted February 25, 2015 Also checking against scope-cant . If your scope reticle is not truly vertical on your rifle's action, you will find you can zero the barrel and scope nicely at one set-range but, the shots will then, hit out of zero and miss at greater distances. As PM says, cant is an issue as it's also an angular measurement. If you have a 2" high scope on a rifle held on its side and zeroed at 15, (which of course you wouldn't but go with it) at 15 yards you'd be spot on. At 30 yards you'd be 2" off on the horizontal. You'd never have your gun on its side, but any angle you do have then this will tend towards this effect. Cant occurs in 2 ways, one is as PM says where you mismatch vertical x hair and ret, but shoot correctly, the other way is where you line ret and action up perfectly and lean the gun when you shoot, To give you an idea how bad this can be, I was shooting at the top level and when I changed gun stocks I set the cheek piece too high, causing me to roll my head over. When I shot I instinctively brought my head vertical, meaning the gun was now canted. of course I'd pick a sloping twig or bush to justify that I was "vertical". I started missing a lot due to "wind" (2" at 45 yards) until my missus and Brian Samson spotted me canting. I didnt believe it, she had to photograph me before I was convinced! Quote Link to post
GaryC 9 Posted February 25, 2015 Report Share Posted February 25, 2015 Could I just add 1 caveat. I am talking about diablo pellets at subsonic speeds. Pellets need to be stable in flight to achieve grouping at distance, so you may get a situation where you have a hollow point that's good to 20-25 but goes unstable afterwards, or a diablo running at 1100 fps that's good to 45 yards. Pellet on pellet with a perfect set up at 14 should be good at 35, but it's theory. I think we'd all agree that if you can get quarry out to 35 you can zero at 30/35 before shooting 1 Quote Link to post
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