WARNING this gets a bit mathy.
I've got a Ruger K77/22-VBZ that I shoot at 25, 50 and 100 yards.
I'm trying to make a distance compensation chart for my scope.
I know I could just use trial and error but I'm a bit of a nerd so I'd like to take a more precise approach.
How do I figure out the velocity?
There are two parts to this question. What is the muzzle velocity? What is the deceleration?
I think if I can shoot at targets at 3 known ranges I should be able to figure out the bullet drop over each of the ranges and then back calculate both of these values (solve 3 equations for 2 unknowns). But how do I figure out the bullet drop? I don't have a tool to determine if the target is at the same height as the muzzle of the gun so I won't know if the gun is exactly level when I fire it. If I assume that the ground is level I can measure the height of the target and the height of the gun but will that be accurate enough?
Is there a well known method to do this that doesn't involve expensive equipment?
WARNING this part gets very mathy. (it probably won't make much sense unless you've taken statistics)
Also it seems to me that accuracy calculations are done incorrectly. Most people seem to consider grouping as a measure of accuracy by measuring the maximum distance between shots. However, from a statistical perspective this is a bad approach since it leaves out information from all of the other shots. It seems that a better method would be to map out the coordinates of each shot on the target. Then you could calculate mean (are you hitting the target on average), standard deviation (what is the spread of your shooting), skewness (do missed shots tend to miss more in one direction than in others) and kurtosis (is your miss rate driven by really wild shots). Aside from the difficulty of doing these calculations wouldn't this be a better measure of accuracy and provide better feedback to the shooter?
Is there some software out there that will let me scan in targets and do these calculations automatically?
I've got a Ruger K77/22-VBZ that I shoot at 25, 50 and 100 yards.
I'm trying to make a distance compensation chart for my scope.
I know I could just use trial and error but I'm a bit of a nerd so I'd like to take a more precise approach.
How do I figure out the velocity?
There are two parts to this question. What is the muzzle velocity? What is the deceleration?
I think if I can shoot at targets at 3 known ranges I should be able to figure out the bullet drop over each of the ranges and then back calculate both of these values (solve 3 equations for 2 unknowns). But how do I figure out the bullet drop? I don't have a tool to determine if the target is at the same height as the muzzle of the gun so I won't know if the gun is exactly level when I fire it. If I assume that the ground is level I can measure the height of the target and the height of the gun but will that be accurate enough?
Is there a well known method to do this that doesn't involve expensive equipment?
WARNING this part gets very mathy. (it probably won't make much sense unless you've taken statistics)
Also it seems to me that accuracy calculations are done incorrectly. Most people seem to consider grouping as a measure of accuracy by measuring the maximum distance between shots. However, from a statistical perspective this is a bad approach since it leaves out information from all of the other shots. It seems that a better method would be to map out the coordinates of each shot on the target. Then you could calculate mean (are you hitting the target on average), standard deviation (what is the spread of your shooting), skewness (do missed shots tend to miss more in one direction than in others) and kurtosis (is your miss rate driven by really wild shots). Aside from the difficulty of doing these calculations wouldn't this be a better measure of accuracy and provide better feedback to the shooter?
Is there some software out there that will let me scan in targets and do these calculations automatically?