According to CoA doc the silencer heated up to 24.5C after 25 rounds:
472. Mr Hayward, in contrast, has we are satisfied taken some steps to satisfy himself that he is right. He started from the proposition clearly supported by evidence that within the sound moderator there would be a very turbulent motion when the rifle was discharged. This by its very nature would produce forces that would tend to mix the blood from the two sources. In addition, the unscrewing of the sound moderator to remove it involved a twisting motion through a number of complete turns, which again would facilitate mixing. Starting from this proposition, it seemed to Mr Hayward that the only likelihood of an unmixed flake of blood would be if the blood from one source dried and blood from the other source then fell upon it. That possibility was recognised and experiments were carried out to see what happened when blood was in the moderator and other shots were discharged. First the temperature of the sound moderator was established after 25 shots had been fired through it. The temperature was found to be 24.5 degrees centigrade, which is substantially less than body temperature, and hence not likely to result in any speedy drying of the blood on the moderator. The further test that was carried out was to introduce blood onto the baffles and cause the rifle to be fired to see whether the blood did in fact dry. It did not and hence the conclusion was drawn that the blood would not have dried more quickly in the moderator than on some other non-porous surface. Having regard to the time span involved, it was therefore unlikely that blood from one person would have dried before the other person was shot. It seems to us that this investigative approach is precisely the sort of experimentation that one would expect from a scientist before a theory was advanced as being capable of being relied upon.
