I don't see how the Hypodermic open in flight with the black collar behind the blades installed?
I've now killed quite a few things with them and never had one open in flight. I've also deliberately shot them with the blades open before I released them. They still flew perfectly. I did this to see what would happen. No difference in the flight with them open or closed from my bow. This was only to 20-25 yards. Maybe at 50 yards they would go wacky in flight?
As far as I'm concerned now, they fly true to 25 yards 100% of the time under any conditions I will use them. So now with this personal experience so far, I will also say that they are about the best short recovery head made and the best blood flow provided for game deer size or less. I would not choose them on a big wild hog with a thick shield either.
If you're shooting at least 60pounds with at least a 28" draw they are great for deer. For elk or bears, I would want 65lbs or more. The more then better with these.
Too low a draw weight, too low an arrow weight, or sub 28" draw with a low draw is a recipe for disaster in my opinion. This head requires more power then a regular fixed blade by a lot.
When shot from a powerful bow, heavy arrow, high speed, it's going to deliver a massive,.... actually sickening fountain of blood when placed right.
Anything game bigger then this, tougher then this, or for far shots, I would use the Slick trick viper trick. These heads penetrate better then anything I've used. They are field point accurate, and zip though big animals even from lighter draw, shorter draw and lighter arrow weights.
I've killed a massive pile of big tough game with these. Never lost an animal yet with them. Some of the trails of blood are fair to good, but not in the same league as the rage hypodermic.
This fall I have killed a big black bear that went only 50 yards, the blood was a fountain with him running off, watching the video you could see it splashing on the ground with each heartbeat. Then I shot two pigs, neither went 50 yards, exactly the same performance. One pig had the fountain of blood pumping out about 2-3' high above it's back as it ran. The other spun like a top and ran about 50 feet before tipping over. The circle of blood from him spinning was 10-12' in diameter in nearly a perfect circle.
