Cumbrian Posted June 30, 2014 Report Share Posted June 30, 2014 This is not about the maximum usable, sensible, or effective range of a .17 HMR. What I should like to know is how far such a round would travel, under ideal conditions, before it ran out of energy? I have read that at 800 yards it will have a drop of nearly 7 feet and a residual force of 13 ft/lbs (which is, incidentally, not to be taken lightly - consider the 12 ft/lbs rule for air rifles). So, let us assume that the bullet is fired at a height of, say, 50 feet or whatever is required to allow for drop, over entirely flat ground with no perceptible wind or intervening objects to deflect it. And how would it compare with a .22 LR round, which allegedly has a maximum distance of 1 mile (but maybe more, if fired from an elevated position?) subject of course to its massively loopy trajectory (which, however, did not prevent it from killing someone, I have read, when a round was fired over a hill with the victim on the other side)? Apologies if this question has been asked previously. Quote Link to comment Share on other sites More sharing options...
Flynn Posted June 30, 2014 Report Share Posted June 30, 2014 You'd need to know the starting energy of the round. I'm not a FAC shooter so I have no idea of what muzzle velocity or energy level a .22LR or .17HMR starts with. If you know this, it's a trivial matter to plug the figures into something like chairgun and get a complete trajectory, along with residual energy levels at distances, amount of drop at any distance you fancy, drift due to wind and so forth. Quote Link to comment Share on other sites More sharing options...
Underdog Posted June 30, 2014 Report Share Posted June 30, 2014 I would like to know to. Say shot at 45degrees. Quote Link to comment Share on other sites More sharing options...
CharlieT Posted June 30, 2014 Report Share Posted June 30, 2014 Maximum Distance Input Data Ballistic Coefficient: 0.125 G1 Bullet Weight: 17.0 gr Muzzle Velocity: 2550.0 ft/s Temperature: 59.0 °F Pressure: 29.92 in Hg Humidity: 0.0 % Altitude: 0.0 ft Std. Atmosphere at Altitude: No Pressure is Corrected: Yes Output Data Atmospheric Density: 0.07647 lb/ft³ Speed of Sound: 1116.4 ft/s Initial Angle: 27.5 deg Terminal Angle: 66.0 deg Terminal Range: 1933.3 yd Terminal Velocity: 247.6 ft/s Terminal Time: 18.3 s Terminal Energy: 2.3 ft•lbs 30/06/14 06:25, JBM/jbmdist-5.1.cgi The above shows the maximum terminal distance. Enjoy !! Quote Link to comment Share on other sites More sharing options...
colin lad Posted June 30, 2014 Report Share Posted June 30, 2014 Maximum Distance Input Data Ballistic Coefficient: 0.125 G1 Bullet Weight: 17.0 gr Muzzle Velocity: 2550.0 ft/s Temperature: 59.0 °F Pressure: 29.92 in Hg Humidity: 0.0 % Altitude: 0.0 ft Std. Atmosphere at Altitude: No Pressure is Corrected: Yes Output Data Atmospheric Density: 0.07647 lb/ft³ Speed of Sound: 1116.4 ft/s Initial Angle: 27.5 deg Terminal Angle: 66.0 deg Terminal Range: 1933.3 yd Terminal Velocity: 247.6 ft/s Terminal Time: 18.3 s Terminal Energy: 2.3 ft•lbs 30/06/14 06:25, JBM/jbmdist-5.1.cgi The above shows the maximum terminal distance. Enjoy !! Charlie i guess you have sprayed your crops of and are waiting to harvest as you seem to have too much spare time lol colin Quote Link to comment Share on other sites More sharing options...
Underdog Posted June 30, 2014 Report Share Posted June 30, 2014 22wmr please :-) Quote Link to comment Share on other sites More sharing options...
CharlieT Posted June 30, 2014 Report Share Posted June 30, 2014 Charlie i guess you have sprayed your crops of and are waiting to harvest as you seem to have too much spare time lol colin I have indeed. Finished silage Thursday and nothing to do until lamb weaning..............................I wish !! Quote Link to comment Share on other sites More sharing options...
CharlieT Posted June 30, 2014 Report Share Posted June 30, 2014 22wmr please :-) For Hornady 30gr V max Sorry it's a bit jumbled, I can't get it to copy as a table ! Maximum Distance Input Data Ballistic Coefficient: 0.095 G1 Bullet Weight: 30.0 gr Muzzle Velocity: 2200.0 ft/s Temperature: 59.0 °F Pressure: 29.92 in Hg Humidity: 0.0 % Altitude: 0.0 ft Std. Atmosphere at Altitude: No Pressure is Corrected: Yes Output Data Atmospheric Density: 0.07647 lb/ft³ Speed of Sound: 1116.4 ft/s Initial Angle: 30.0 deg Terminal Angle: 69.9 deg Terminal Range: 1520.0 yd Terminal Velocity: 219.4 ft/s Terminal Time: 17.4 s Terminal Energy: 3.2 ft•lbs Quote Link to comment Share on other sites More sharing options...
Underdog Posted June 30, 2014 Report Share Posted June 30, 2014 Cheers. Less than a mile! Make a good squirrel gun! Oops! Flak coming in!! Quote Link to comment Share on other sites More sharing options...
fortune Posted June 30, 2014 Report Share Posted June 30, 2014 Allegedly a 22 lr travels the furthest distance for that caliber when launched at a 30 > 35 degree angle and the boxes have a warning of 1.6k + 1mile. But if fired from the shoulder level to the ground I "think" that the distance to ground impact is only about 200 yds Quote Link to comment Share on other sites More sharing options...
CharlieT Posted June 30, 2014 Report Share Posted June 30, 2014 Allegedly a 22 lr travels the furthest distance for that caliber when launched at a 30 > 35 degree angle and the boxes have a warning of 1.6k + 1mile. But if fired from the shoulder level to the ground I "think" that the distance to ground impact is only about 200 yds Here you go............... Maximum Distance Input Data Ballistic Coefficient: 0.138 G1 Bullet Weight: 40.0 gr Muzzle Velocity: 1065.0 ft/s Temperature: 59.0 °F Pressure: 29.92 in Hg Humidity: 0.0 % Altitude: 0.0 ft Std. Atmosphere at Altitude: No Pressure is Corrected: Yes Output Data Atmospheric Density: 0.07647 lb/ft³ Speed of Sound: 1116.4 ft/s Initial Angle: 30.0 deg Terminal Angle: 62.7 deg Terminal Range: 1736.7 yd Terminal Velocity: 251.1 ft/s Terminal Time: 17.7 s Terminal Energy: 5.6 ft•lbs If we say that shoulder height is 5ft (60") then a 60" drop would occur at 370 yds. Quote Link to comment Share on other sites More sharing options...
Cumbrian Posted June 30, 2014 Author Report Share Posted June 30, 2014 (edited) Maximum Distance Input Data Ballistic Coefficient: 0.125 G1 Bullet Weight: 17.0 gr Muzzle Velocity: 2550.0 ft/s Temperature: 59.0 °F Pressure: 29.92 in Hg Humidity: 0.0 % Altitude: 0.0 ft Std. Atmosphere at Altitude: No Pressure is Corrected: Yes Output Data Atmospheric Density: 0.07647 lb/ft³ Speed of Sound: 1116.4 ft/s Initial Angle: 27.5 deg Terminal Angle: 66.0 deg Terminal Range: 1933.3 yd Terminal Velocity: 247.6 ft/s Terminal Time: 18.3 s Terminal Energy: 2.3 ft•lbs 30/06/14 06:25, JBM/jbmdist-5.1.cgi The above shows the maximum terminal distance. Enjoy !! Well, that seems to answer most of what I had in mind. Thank you. Simples (when you know how)! Edited June 30, 2014 by Cumbrian Quote Link to comment Share on other sites More sharing options...
kent Posted June 30, 2014 Report Share Posted June 30, 2014 Lets just say open space is no backstop as you cannot see far enough with the naked eye with any eh ? Non of these take into account the bullet failing to remain stable in flight which is highly likely but pure academics when you look at the ranges. With skirted air pellets tumbling drastically reduces calculated ranges Quote Link to comment Share on other sites More sharing options...
welshwarrior Posted June 30, 2014 Report Share Posted June 30, 2014 If we say that shoulder height is 5ft (60") then a 60" drop would occur at 370 yds. That's one big cricket square. Quote Link to comment Share on other sites More sharing options...
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