It doesn't appear to say that in the page you published below this post? He says it is best not to generalise too much. But I have also read that a .22 contact shot the drawback went only a few mm into the barrel?
I must admit however that if drawback did occur in this case then the absence of blood in the barrel of the gun is a problem for my theory. However it is said that the blood in the silencer allegedly found by the relatives travelled down a long way into the silencer. Now to my mind there is such a thing as "overkill". What I mean by this is that it would probably only travel that far into the silencer if it have been put there deliberately.
I posted the page I did because it has some valuable information:
1) the forward parts of the outside of the weapon will get hit with high velocity backspatter
2) blood that can get inside the barrel is a factor of distance and ammunition used
A) 22 caliber weapons will get blood inside when fired up to 1.5 inches away
B) larger caliber weapons can get blood inside when fired up to 5 inches away
C) blood can travel up to about 5mm deep at the ranges discussed in A and B but will not travel beyond this in any significant amount unless fired at contact range
Even a significant amount of blood doesn't mean a huge amount. Terms are relative. There are bigger and smaller particles of blood but even the bigger ones are tiny. They are all atomized blood particles. The bigger ones can't ravel as far as the smaller ones. That is why you will see the larger drops of blood at the beginning of the muzzle and the ones further inside will be smaller. By the same token smaller particles will read a shooter several feet away while the larger particles will not make it that far.
This page even highlights the importance of wound location. Wound location determines whether spatter will occur or not. It is a factor of the properties of the skin and blood vessels in the wound area. Source after source that i have read note that while larger caliber rounds to the head often result in spatter that headshots from 22 calibers usually don't. This not only brings home the fact you have to look in detail at the location of the wounds but has relevance to the case at hand because the boys suffered head shots. The prosecution experts didn't view any of their head wounds as being likely to result in spatter. So that means their blood would not be expected to be found in the weapon or on the shooter. In contrast June and Nevill had wounds that would result in blood on the shooter most obvious though would be the medium velocity spatter from the beating. Medium velocity spatter is not atomized is it larger blood particles that would be easy to see.
The distances inside the weapon/moderator are also relative. More than 5mm is considered deep. 1-3 inches being called deep sound odd but that is the use of the term in that instance. So you have to actually understand the meaning of terms and not use their ordinary everyday meaning.
