So, after this long story I will go through the technical details that most of you would like to know:
I used a 300whisper rifle that I built a few years ago. It is based on a Cz fox action that I blue printed and rebarrelled with a Border Barrel tube with a 1 in 8" twist.(
http://www.border-barrels.com/)
The barrel is 16" long.
The suppressor is made locally here in NZ, and performs reasonably well.
The load that I used to take the deer above consists of a 125gr ballistic tip pushed by 16.5gr of VV N110, and primed with a federal small rifle match primer.
The bullet exit at about 2300fps. I had tried some loads with 17gr but some cases seemed a bit harder to extract. So again, this 16.5 gr load is safe in my rifle but might not be in yours...
This load groups in a 2" circle at 120yards. It might not be impressive by today's benchrest standards but I have not tried any other load development either.
I also shoot a 240gr MK with 9 gr of VV N110 that consistently groups in 2" at 200yards.
The only issue I have here is that the supersonic round shoots 2Mils up and 1/2 mil right of where the subsonic round shoots. So to avoid being confused I always zero for one load or the other depending if I am going hunting or plinking.
On this particular hunt, I decided to go with the supersonic load because :
1-I was hunting deer for the first time with the whisper
2- I had no idea how the subsonic round would have performed on deer
3- I did not know the terrain and how hard it would be to track an eventually wounded animal
4-I was invited by a friend for the first time there, and did not want to leave a bad impression in case things turned into custard.
Now for the terminal performances of the bullet:
I shot the fallow sideway. The bullet entered the left side just behind the shoulder and exited on the opposite side midway in the rib cage.
After further investigation I noticed that the diameter of expansion went about to 3" into the meat,next to the shoulder blade, and then the rest of the cavity through lungs and the the other side was about an inch in diameter.
My conclusions so fare are that:
1-this load is adequate for fallow deer (as long as you do not flinch and place your shot well)
2-penetration through the rib cage is good. Also I am not sure how it would have performed if the bullet had gone through the shoulder blade.
3- destruction of tissues was sufficient to provide a fast kill.
Of course, shooting only one animal is nowhere enough to establish any definite conclusion about the performances of this particular load, but I thought that this experience could help the whisper community a little bit more.
Nicolas .