Salop Matt Posted June 3, 2012 Report Share Posted June 3, 2012 Right, with my HMR I have my first zero at 50Yards and second at 100yards....... Later this month am on a tunnel range (50 mtr) and want to make sure my rifle is truly spot on as it is guaranteed that there will be no wind in there ! Now here’s the problem.... Its 50 meters long and not 100yards! So as I want to check it I need to put into chair gun the HMR with first zero at 50yards(45.72mtr) and second zero at 100yards(91.44mtr)and once I have that chart I need to know exactly how high the round should be at 50meters ! As this will allow me to confirm being spot on for my zeros! So can anyone help me do this please as I don’t understand chairgun! ATB Matt Quote Link to comment Share on other sites More sharing options...
kent Posted June 3, 2012 Report Share Posted June 3, 2012 Firstly, a lot depends on scope to bore height. also you will get variance on pressure, hight above sea level etc. Set you HMR to shoot certainly under 1/2" high at 50 yds at a guess but like i say it depends. A HMR is usually set for zero at 100yds, the peak trajectory will then occur at around 80 yds and the best use of the arc made (ie closest to line of sight. Tunnel ranges are very good for windage settings so get that bang on, then do the 100 yds zero outside for elivation. producing any dope data (drop and windage chart) you always have to actually have to shoot the gun to proove it. remember wind can move you up and down aswell as side to side, especially on hilly ground. Quote Link to comment Share on other sites More sharing options...
wymberley Posted June 3, 2012 Report Share Posted June 3, 2012 (edited) Provided I've read this correctly, the answer is a tad under 0.09". To get your 50 and 100 your sight height would be 1.8". That's the theory according to Sierra Infinity Suite for standard atmospheric conditions at sea level. In practice; it's anybody's guess. Edit: PS Just thought, if you've not shot a pipe range before and even if you have a moderator fitted, ear plugs AND muffs wouldn't be OTT especially if there's others present with bigger calibres/no mod's. Edited June 3, 2012 by wymberley Quote Link to comment Share on other sites More sharing options...
drut Posted June 3, 2012 Report Share Posted June 3, 2012 AFAIK Chairgun is geared for subsonic use only. There is some good info and charts for .17hmr on http://www.varmintal.com/17hmr.htm Quote Link to comment Share on other sites More sharing options...
rallyrus Posted June 5, 2012 Report Share Posted June 5, 2012 HawkeBRC is pretty good too, according to that you will be 0.22cm high as has been said tho depends on scope height, temp, pressures etc Quote Link to comment Share on other sites More sharing options...
apache Posted June 5, 2012 Report Share Posted June 5, 2012 I'd just re-zero @ 50 meters! Quote Link to comment Share on other sites More sharing options...
bedwards1966 Posted June 6, 2012 Report Share Posted June 6, 2012 It sounds like it'd be easier to just go onto a patch of land that's a bit sheltered from the wind if possible, on a day without gale force winds, and just shoot a few rounds at the distance you normally shoot at? It's best to zero at the range you shoot at instead of closer then trying to work it out from ballistic charts. Quote Link to comment Share on other sites More sharing options...
kent Posted June 6, 2012 Report Share Posted June 6, 2012 It sounds like it'd be easier to just go onto a patch of land that's a bit sheltered from the wind if possible, on a day without gale force winds, and just shoot a few rounds at the distance you normally shoot at? It's best to zero at the range you shoot at instead of closer then trying to work it out from ballistic charts. not just best but essential, all data so produced needs proving in the field Quote Link to comment Share on other sites More sharing options...
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