Outdoorsman Posted June 23, 2015 Report Share Posted June 23, 2015 I got a brand new Hmr the other day took it out to zero, zeroed at 80ish once the groups got tight but noticed when i moved to 35-40 it was low and right, and at 100 it was low and left, still nice clover leaf tiny groups, has any one else noticed this or any ideas Quote Link to comment Share on other sites More sharing options...
Mentalmac Posted June 23, 2015 Report Share Posted June 23, 2015 At 35 yards if zero'd at 100 mines low... Quote Link to comment Share on other sites More sharing options...
Savhmr Posted June 23, 2015 Report Share Posted June 23, 2015 It just means at 35 yds that the bullet hasn't crossed line of sight and at 100, it's passed through point of impact for zero and dropping off. Being to one side or the other can just be as a result of the effects of windage. Quote Link to comment Share on other sites More sharing options...
Underdog Posted June 23, 2015 Report Share Posted June 23, 2015 Different horizontal impact points either side of zero can be due to scope and barrel vertical alignment error/run out. Often by mounts or a bent objective scope bell. It can be tested by swapping the mounts around and noting any change. A reversal of the results after moving the mounts would indicate the mounts are out. Sometimes when this is the case just rotating one mount to the opposite position will correct the error. This can be done also via bore sighting on a distant object and with the scopes centred adjusters. The bore and scope should be very close on the same distant object. If not and the mounts are not adjustable. Swap them around and note the change. Go from there. Quote Link to comment Share on other sites More sharing options...
Outdoorsman Posted June 23, 2015 Author Report Share Posted June 23, 2015 It was the side to side motion i was enquiring about its all most as if when the bullet leaves the muzzel it travels right then arcs back to left, but with it grouping well it must be a constant so doubt its windage, i was just wondering wether it was common in hmrs Quote Link to comment Share on other sites More sharing options...
BRYAN3 Posted June 23, 2015 Report Share Posted June 23, 2015 It sounds as if you are canting the rifle or scope not mounted verticaly or a little bit of both. At 35-40m the round is still rising towards the crosshair and is off centre. Once passed the 80m zero it has crossed the vertical to the other side. Quote Link to comment Share on other sites More sharing options...
Outdoorsman Posted June 23, 2015 Author Report Share Posted June 23, 2015 Its maybe half an inch right at 35-40 then 1/4 to half an inch left at 100 if that helps Quote Link to comment Share on other sites More sharing options...
Underdog Posted June 23, 2015 Report Share Posted June 23, 2015 The only thing that will help you diagnose the fault is if you carry out the steps I suggest. No it is not a trait of hmr or any other rifle to send bullets flying in the arc of a banana on the horizontal plane! Quote Link to comment Share on other sites More sharing options...
BRYAN3 Posted June 23, 2015 Report Share Posted June 23, 2015 The error is half as much at 100 because it is only 20m over zero. At 40m it is 40m below zero distance(80m). I still think its a scope out of plumb(not level) Quote Link to comment Share on other sites More sharing options...
Outdoorsman Posted June 23, 2015 Author Report Share Posted June 23, 2015 Cheers underdog ill give it a whirl 😃 Quote Link to comment Share on other sites More sharing options...
Outdoorsman Posted June 23, 2015 Author Report Share Posted June 23, 2015 Bryan i might clamp the gun up and bubble it with a mini spirit level then do the same with the scope will that work to make it all square Quote Link to comment Share on other sites More sharing options...
Underdog Posted June 24, 2015 Report Share Posted June 24, 2015 Let us know how it turns out :-) Quote Link to comment Share on other sites More sharing options...
welshwarrior Posted June 24, 2015 Report Share Posted June 24, 2015 Sounds like the crosshairs are not running vertical, check it with a plumb bob. Quote Link to comment Share on other sites More sharing options...
BRYAN3 Posted June 24, 2015 Report Share Posted June 24, 2015 Some scope/rifle combinations are easy enough to level as they have flat top receivers,some are impossible. There are various devices available. I bought scope levelers but they seemed to be of dubious quality. You could try marking a vertical line on your target right through the bull using a 3-4ft spirit level. As you dial elevation or depression on the top turret you will see point of impact rise or drop accordingly. If the the crosshair is askew the POI will move one way on rising and the other on dropping. Sometimes the scope appears level as you look through it normaly but,if you hold the scope at arms length you can see the crosshair is not striking a vertical line through the rifle receiver. Try to count the total clicks on the windage turret ie 56 and then wind it back 28 to centre the reticule. Make sure both mounts have the clamp screws on the same side. If the fall of shot is way off to one side,try swapping mounts front to back. There are so many things that can cause bother and its good to eliminate any possible causes. Good luck. Bryan. Quote Link to comment Share on other sites More sharing options...
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