I was wondering if the caliber of the bullet matter when you headshot a zombie could you use something ass small as a .22 because if you could that would seem a good round to use small light and easy to carry. Appreciate any insight anyone can give.
I think for a rifle, you're going to have to go with a 5.56, just for ease of use. Parts for any 5.56 rifle tend to be prevalent, along with ammo being available. I'd look at the Colt AR-15A3 with a picatinny 4-rail system.
Also, does anyone have any thoughts about the following?
-folding front pistol grip
-folding rear pistol grip
-a stock saddle (for mags)
-a brass catcher
-Is there a point in putting rail covers on the picatinny?
Lets start from the top....
- Why? The more moving parts the more likely it will break. Stick with a fixed forward grip.
- Why in Gods name? There is no real use for anything like that period.
- Great idea on gun that will be used for DMR ( designated marksmen rifle) or a fixed position weapon.
- 90% of all ARs come with those. The idea behind is to remove your flash signature. Not a real issue with the undead.
- Extra weight. Carry mags on the person.
- Why? Reloading? Running around with a mesh bag on your rifle sounds like a snag magnet.
- yes rail covers are useful. Keeps you from grinding the rails to a point of nonuse. And those little guys are sharp. No reason to bang yourself up.
The problem is consistency. A .22 will not penetrate the skull every time. Better to go with the next size up which is .223 or 5.56mm(There is a slight difference between the two rounds though usually a 5.56 rifle will fire .223 but if memory serves me correctly not always the reverse.).
It has to do with the length of the bullet, not the calibre, if I remember corretly. The three should all have the same real diameter (.22, .223, and 5.56mm), the differene between the rounds is the case size, and as a result, the amount of powder behind it. the reason the 5.56 will have better penetration is beause it's going a heck of a lot faster, it's pointier, and it's more likely to be jacketed.
Also, you're right; a .223 can go into a rifle that will fire 5.56mm, but not the other way around. However, people should avoid firing .223 through a 5.56mm weapon all the time, as it an lead to (I hear) reciever stress.
I have two preferences. First, the .45 ACP round would almost certainly destroy the brain. The round generates a good amount of hydrostatic shock, which means major damage to all components of the brain. It is also readily availible.
Choice two would be the .357 Sig round. Powerful enough to fully penetrate the cranium and the bottleneck design of the round makes for almost no chance of jamming.
In regards to bouncing, this seems to be a hot topic in this group. larger calibers make impressive holes that put nice holes inside the organs and tissues they hit, as well as concussive damage as they move through. But as an emergency room employee i can tell you that you can follow the path of a .22 as it bounces around based on the air pockets it leaves. We have seen one patient that actually had a bullet change direction no less than three time without impacting a bone. I can also tell you, in the case of suicides and attempted suicides that we have seen come through here, that .22s do in fact bounce, again we know this due to ct images. where as larger bullets make larger holes, we see a higher mortality rate with the small rounds. please see the section in this link called "penetrating trauma" http://www.emedicine.com/emerg/byname/trauma.htm
Now it should also be said that there are a lot of variables, range being a key one. the closer you are, the more penetration there will be, be we arent talking skin contact here, we are talking about shooting from distance, and with a human skull being 1/4 inch thick its pretty hard. it is very possible that when the bullet lacks the power to push its way out that it will deflect, cause the effect of another bullet path and twice the damage.
Remember, pistols/handguns are no good for longe range shots. You're not gonna be shotting down Zs with a pistol at 200 yards away. But then again, if a Z is that far, I'd just save ammo and get outta there