[tss68nl]

I disagree on the historical value of the blood mod (I only said it doesn't matter in terms of cheating).

1) Bullet impacts do not generate large sprays of blood. They only do so in the movies. It can, now and then, happen that you see some blood flying out, but it's not very likely. The reason for this is that a large area around the path and impact spot of the bullet is compressed, and thus all blood is forced out of the tissue away from the damage done by the bullet. Blood only appears a second or so after impact, as then the vessels opened again. Which brings us to point 2:

2) The uniforms in those days were so thick, they would not let blood through within a minute or so. You could be bleeding like a nut, you would not see anything on the outside. Those uniforms tended to gather rather a lot of dust, and this is why you do see some small dust puffs on impact. Any incidental blood on impact (see point 1) would be catched by the uniform.

This only leaves for an incidental blood spillage when hit in the head, and possible stains afterwards, but seeing the whole picture a blood mod is more unrealistic than spot on.