There have been several threads in the past few weeks/months concerning ranging targets in the Hunter Field Target division of AAFTA rules. The term “bracketing” often shows up and there have been a couple/three posters describe the techniques involved, sort of. I’m going to describe two different “bracketing” techniques demonstrating with photos I screenshot off of the Chairgun Elite app. Those two will be broken up into separate posts under this thread topic. I will also describe a third “bracketing” technique that does not involve measuring a fixed dimension but estimating distance between two distances, eg. 45 to 50 yards or 50 to 55 yards.
Having said all of that, let’s define bracketing for our purposes:
1 - Determine distance by placing an object of a known dimension between two or more marks also of a known dimension. (Most field target clubs mount the targets to a cinder block which we know is 7.625 inches square on the end. Some clubs utilize common size lumber such 2” x 8“ boards. Clamps are often used to secure the target which are not all uniform in dimension but you can measure a particular variety of clamp and keep a set of dope for that dimension.)
2 - Use data gathered from either parallax ranging a target with the scope focus or by using the known dimension technique above. Eg. - while ranging with parallax at 16x per the AAFTA HFT rules is often difficult, it is far easier to determine if a target is closer to 45 or 55 yards. I will describe this in more detail in a separate post.
The screenshots below, as I mentioned earlier, came from Chairgun Elite. I used that app because it is still available and supported. If you have Strelok, it would show the same dimensions and hold over values.
This first set of photos were captured while using the Sightron SIII 10-50x60 MOA-2 reticle at 16x. The zero for this set is 50 yards (for clarity), the scope is mounted 2” above the bore center line, the projectile is a JSB 10.3g being shot ts 915 fps and 19.15 fpe. You will notice that there are three MOA between the main marks at 16x. A 1.5” kill zone is 3 MOA at 50 yards.
The yellow square represents a common cinder block and the red circle is representative of a 1.5” kill zone. On my scope reticle, which I used here, a block is 15 MOA wide at 50 yards or 5 marks on the reticle. At 45y 5.5 marks and at 55 4.5 marks.
That, in a nutshell, is bracketing a known dimension block.
MATCH DIRECTORS KNOW THIS! Some of them will abscure the block with foliage, a feed sack, turn it side ways, etc. Never fear, in my next post in this thread I’ll give you plan B.
Art “Podna” Womack
Daystate Wolf Pack
Having said all of that, let’s define bracketing for our purposes:
1 - Determine distance by placing an object of a known dimension between two or more marks also of a known dimension. (Most field target clubs mount the targets to a cinder block which we know is 7.625 inches square on the end. Some clubs utilize common size lumber such 2” x 8“ boards. Clamps are often used to secure the target which are not all uniform in dimension but you can measure a particular variety of clamp and keep a set of dope for that dimension.)
2 - Use data gathered from either parallax ranging a target with the scope focus or by using the known dimension technique above. Eg. - while ranging with parallax at 16x per the AAFTA HFT rules is often difficult, it is far easier to determine if a target is closer to 45 or 55 yards. I will describe this in more detail in a separate post.
The screenshots below, as I mentioned earlier, came from Chairgun Elite. I used that app because it is still available and supported. If you have Strelok, it would show the same dimensions and hold over values.
This first set of photos were captured while using the Sightron SIII 10-50x60 MOA-2 reticle at 16x. The zero for this set is 50 yards (for clarity), the scope is mounted 2” above the bore center line, the projectile is a JSB 10.3g being shot ts 915 fps and 19.15 fpe. You will notice that there are three MOA between the main marks at 16x. A 1.5” kill zone is 3 MOA at 50 yards.
The yellow square represents a common cinder block and the red circle is representative of a 1.5” kill zone. On my scope reticle, which I used here, a block is 15 MOA wide at 50 yards or 5 marks on the reticle. At 45y 5.5 marks and at 55 4.5 marks.
That, in a nutshell, is bracketing a known dimension block.
MATCH DIRECTORS KNOW THIS! Some of them will abscure the block with foliage, a feed sack, turn it side ways, etc. Never fear, in my next post in this thread I’ll give you plan B.
Art “Podna” Womack
Daystate Wolf Pack
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