Over the past few weeks there have been a few well viewed and replied to posts on chest shots and why some deer run and others Bang Flop (BF). Three are linked below for anyone who hasn't been following them.
Heart and Lung shots.
Is it inevitable that a lung shot deer will run?
It's a subject I am very interested in. Over the past few years I have been keeping pretty good records of all the deer I have shot. Taking out all the neck shots and anything that was a bit close to the spine, just focusing on the clean heart/lung shots, analysis of the data suggests that to give yourself the best chance of a BF you need a heavily constructed bullet travelling at about 3000 fps or more on impact. It can be achieved with a fragmenting bullet but the occurrence goes down to about 25%. The chance of achieving a BF with a Terminal Velocity of 2700 fps or less goes down below 10%.
Problem is, as a few have pointed out, my data pool is just under 100 deer and only spans 4 calibres. Not statistically relevant enough to draw any real conclusions from. What I would like to do is increase that data pool to a statistically relevant 1000. I could spend the next 20 years trying to get there, but it would be much easier to pool the experience of some of the members of this forum and hopefully get it done in under 12 months.
So I'm looking for volunteers. Doesn't matter what calibre you shoot, we want as wide a spread as we can get. If a 222 is your thing then that's just as good as a 338LM for this research. Ideally you would be willing to run 2 bullets. The first a light for calibre one that can be revved up to achieve 3200 fps at the muzzle, the second a heavy for calibre bullet that has an MV of around 2800 fps or less. Both will have similar energy levels, the heavier possibly a little more. What we will be looking for is a difference in the chances of a BF when you change bullets. Changing from a frangible bullet to a bonded or Barnes would be just as helpful. If you don't want to change bullets that's fine as well. Your data is just as valuable to the research.
The only shots to be recorded are clean heart/lung shots. No neck, heads, guts and nothing that is so close to the spine that the BF could have been caused by shrapnel to the spinal cord.
Questions I am trying to answer through the research:
1. Does calibre make any difference to the BF rate?
2. Does bullet weight make any difference to the BF rate?
3. Does energy make any difference to the BF rate?
4. Does bullet construction make any difference?
5. Is there a relationship between bullet speed and the BF rate?
What you will need to record:
4. Awareness - was it aware you were there?
5. Shot placement - Shoulder, Heart or Lung?
6. Distance run or BF
8. Bullet - Frangible, Bonded or Barnes?
9. Bullet - weight
10. Bullet Terminal Velocity (not MV, it's irrelevant)
If you want to join the research I will email you a spreadsheet to fill in to make things easier for you and for me when I collate it all.
Why bother? Well there is a huge amount of debate over the subject. Lots of people have theories but to my knowledge no real research exists that can prove anything one way or another. This forum has the power to put that right. Between us we shoot enough deer to make some real progress on subjects like this.
If anyone has any ideas for more data that needs collating to prove the point, please feel free to suggest, it's better to add to the questions before we start than to find out we missed something crucial later.
If you want to join in please reply to this thread and I will send you a PM.
For those of you who think it's all a waste of time please don't bother replying to this thread, we don't really need your advise, this will get proven one way or another when we get to 1000 records.
Ambitious I know, but if you don't try you will never learn anything.
Thanks for your help.