No, sorry, you are dead wrong here. There is no such thing as "hydrostatic shock" and the deer doesn't die because it's blood pressure goes up, it dies because its blood pressure goes DOWN, all the way to zero. I speak with the authority of 22 years' experience as an animal anatomist, physiologist, and pathologist, 30 years' plus experience as a hunter, and having seen more than my share of gunshot wounds in humans and animals.
You are under a total misapprehension as to the killing mechanism of the bullet -- regardless of type or make. I am not willing to start this thread going on rec.hunting again, but I assure you that there is not, and cannot be, any such effect as you describe as an "instant stroke" from a gunshot wound. Stroke is a much, much different phenomenon and it does not, period, arise from an increase in blood pressure at all. Nor could any such pressure be set up in the circulatory system of any mammal by any bullet under any circumstances