furrybean Posted April 27, 2017 Report Share Posted April 27, 2017 Ive heard the phrase "lights up sights up", or "lights up strikes up" but what real world values have you equated this too? I was looking at a plot from the other week and I was getting a MOA shift approx due to both mirage and sun. In the past Ive normally dropped to the bottom of the V to compensate and its been okay but not had this magnitude of shift before. Link to comment Share on other sites More sharing options...
The Gun Pimp Posted April 27, 2017 Report Share Posted April 27, 2017 The 'lights up - sights up' refers to distance judgement. On a bright, clear sunny day you can see more - so things look nearer - but they ain't - so 'sights up'. It's an old military thing but obviously doesn't apply to optical sights. Mirage is a totally different thing and can easily shift the image a half MOA at 100 yds - I've experienced this when shooting benchrest in hot countries. Set your crosshair on the bull - wait for the condition - only to find your crosshair is now well above the bull! I hate mirage. Link to comment Share on other sites More sharing options...
brown dog Posted April 27, 2017 Report Share Posted April 27, 2017 For optical sights, refraction means the opposite maxim should be applied: Lights up, sights down. Bright sunshine to overcast - or vice versa- will be about a 0.5moa shift Link to comment Share on other sites More sharing options...
furrybean Posted April 28, 2017 Author Report Share Posted April 28, 2017 I think Ive found the issue. The forend of the stock is touching and not fully floating. Might explain the verticals! Link to comment Share on other sites More sharing options...
ted105 Posted August 18, 2017 Report Share Posted August 18, 2017 Will you open out the for end,or is it free floating already. Link to comment Share on other sites More sharing options...
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