continued...
Do you think archery hunting is more ethical than hunting with a rifle? When you compare statistics from studies that looked at rifle hunting, the lowest recovery rate is 88% for a Red deer and up to 99% for a muntjac deer. Subsequently, 95% of first shots with a rifle resulted in a one shot clean kill, and 81% of wounded animals were recovered with a follow-up shot (Aebischer et al., 2014). Studies have also shown wound rates between 1:1 and 1:4 with 1:1 being the most popular ratio in hunting literature (Ashby,1996). These comparisons are showing typical numbers of wounding and recovering deer of an ordinary rifle hunter and an average archery hunter. With the above statistics, research points to archery with a substantially higher wound rate than a rifle, or another weapon of choice. This is not comparing holding a compound bow at arm's length in the air with a rifle shooting at an extended range in the prone position and with a bipod on a steady rest typically found in long range hunting.
Whichever weapon you choose to hunt with, it is essential to understand that it as soon as the bullet or arrow leaves your weapon, it is merely a math equation on whether the projectile is going to impact where you want it to impact. Many factors will determine the trajectory of the flight. These factors include speed, Drag, time of flight, wind, and the weight of the projectile. These factors are the same if you shoot a compound bow at 20 yards or a rifle at 2000 yards. Your projectile travels in an arch until impact with another mass stops it. During that time of flight, the most significant factor is gravity and speed in which the projectile is traveling. A typical rifle projectile weighing 195 grains moving 3,100 feet per second (FPS) will drop due to gravity 205” over 1,000 yards. That is 17.08’. Almost half of the total loss of elevation of the projectile is lost in the last 200 yards. With a shot between 800-1000 yards, you lose roughly .43” per yard. With a standard arrow weighing 400 grains traveling 250 feet per second (FPS), you lose 22” of elevation between the ranges of 30 and 40 yards. This translates to 2.2” per every yard. This is important for your margin of error when shooting an animal after you have ranged it. If the animal takes a few strides away from between the time you range it and shoot, it can translate to a non-lethal shot if. The average vital region on a deer is 10” and if you are aiming in the center, you will have a 2-yard margin of error between 30 and 40 yards. If you are hunting with a long range rifle, you will have an 11-yard margin of error between 800 and 1,000 yards.
The two most influential long range shooters are Todd Hodnett and Bryan Litz. Todd trains the military for long-range snipers and has produced numerous literature and videos on the subject(Bertrand, 2016). Bryan Litz has designed and developed a program called Applied Ballistics which is a program using advanced mathematical formulas that have been tested in a plethora of scenarios. Applied Ballistics is the standard on coming up with the mathematical equation of a long-range shot. Bryan has tested many projectiles in labs to come up with accurate ballistic models and trajectory flights. Together they have also come up with a Weapons employment zone (WEZ) analysis which is a mathematical formula behind the probability of hitting a target at a given distance through uncertain parameters(Litz, 2012). The WEZ analysis is an accurate measurement of any person effectiveness while shooting a rifle. You can use the same parameters and apply them to any weapon system whether it be archery equipment, muzzleloading equipment, or a long range rifle.
Using the WEZ analysis, you can find your maximum effective range by practicing and inputting data into the formula, for a confident shooter using premium equipment, the WEZ analysis shows you can be 91% accurate at 1200 yards with a target the size of a standard IPSC target of 18.5" wide and 30" tall (Litz, 2012).
When it comes down to taking the life of the animal you are pursuing, it is not only the hunter’s responsibility to quickly make the kill; it is their moral and ethical pursuit most strive to achieve. Shooting an unalerted animal with a 91% chance of a mortal wound which will result in a relatively sudden death by hydrostatic shock is more ethical than hunting an animal at a typical range of 30 yards with a recovery rate of around 80% and a slower death by hemorrhage.
It doesn’t matter if an archer has the skill and knowledge to take a deer at 100 yards or if a sportsman is shooting a rifle at 1,500 yards at a deer. There is a physical limit to one’s range that can not be overcome by ability. If the projectile does not have the kinetic energy to kill the animal at the given range it stands ethically, then the shot is too far. With the general rule of thumb of 1,000 ft.lbs for deer, and 1,500 ft.lbs for elk. Using the same rifle as the previous example, the maximum range to adequately supply enough kinetic energy to kill a deer would be 1,750 yards and 1,300 yards for elk. For an arrow, the general rule of thumb is 30 ft.lbs for deer and 40 ft.lbs for elk. With the same arrow shooting the same speed in the previous example, the maximum range an archer can ethically shoot a deer would be 150 yards and 90 yards respectively for elk. Both of these examples far exceeds the vast majority of most shooters or archers ability however one should never attempt a fatal shot beyond these distances. With a wide range of cartridges offered in rifles, it is easy to choose a caliber and bullet that will extend the capabilities of a rifle while an archer’s most significant limitation is one’s strength to pull a bigger bow back to supply more energy. Kinetic energy is an essential measurement of equipment performance often overlooked.
Long range hunting whether it is with a bow, muzzleloader, or rifle should not be defined by parameters but by skill and equipment being used. It is unfair to judge sportsman by their method of take in the field based off of an emotional response. It is also unfair to the animal to attempt a shot at a distance that exceeds your WEZ analysis or your maximum effective range at that given distance. As a sportsman, it is vital to not only know your limits but to have the discipline to stay within those limits when in the field and weather conditions. Extending your maximum effective range is done with understanding trajectory flight, having the correct equipment, implementing proper form, and most importantly practice at the range. Hunters with the adequate equipment shooting beyond their maximum effective range provide a means for division among sportsman and should not represent the highly skilled individuals who take the field who shoot within their limits.
References
Aebischer, Wheatley, Rose, & Sueur. (2014) Factors Associated with Shooting Accuracy and Wounding Rate of Four Managed Wild Deer Species in the UK, Based on Anonymous Field Records from Deer Stalkers. Retrieved from
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4198128/
Ashby, E. (1996). Arrow Lethality. Retrieved from
https://docs.google.com/viewer?a=v&...VuZGx5LmNvbXxob21lfGd4OjM2MDIyM2ViZjQ0ZjMwYmQ
Bertrand, T. (2016) Long Range Made Easy, DVD Review. Retrieved from http://www.rokslide.com/long-range-made-easy-dvd-review/
Ditchkoff, Welch, Lochmiller, Masters, Starry, & Dinkines.(1998) Wounding Rates of White-tailed Deer with Traditional Archery Equipment. Retrieved from
http://wp.auburn.edu/deerlab/wp-content/uploads/2014/05/581998-SEAFWA.pdf
Litz, B. (2012) Weapon Employment Zone (WEZ) Analysis retrieved from
http://www.appliedballisticsllc.com/Articles/ABDOC115_ProbabalisticWEZ.pdf
Pederson, Berry, & Bossart. (2008) Wounding Rates of White-tailed Deer with Modern Archery Equipment. Retrieved from
http://www.seafwa.org/pdfs/articles/Pedersen-31-34.pdf