This is another monster round,you wouldnt like to get hit with!That weapon would probably end up weighing 30 lbs and carrying around the ammo for that thing would also be heavy as hell thus making it simply not practical to carry into combat. But it may interest you to know that there are 20mm and legend has it 25mm anti-material rifles out their.
Anzio 20mm Anti-Material Rifle
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20mm compared in size to other rounds
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The British 5.56 round is a nasty little thing, when it hits a person it sort of travels around the body causing mayhem. If it hits you in the leg it is just as likely to run up your leg bone and wind up in the pelvis area.
I think perhaps that he is refering to 5.56 ammo of "British manufacture". Here in Australia we use the SS109 (unless it has changed again) US specification, but manufactured in Australia.The British 5.56? I thought everybody used standard 5.56 NATO ball.
All of the above loads are far better then the standard M193 Ball (Older 55Gr US Service Load) and the M855 (Current NATO SS109 Service Load).
All of the loads listed above are expanding loads ranging between the 40gr-75gr load. All have a excellent record against both the two and four legged variety of game. All are used by Police and Sportsmen. And all are available currently in the US Market.
The main issue is not the caliber of the cartridge put the projectile. The fact that we're using a 62Gr Steel Core Load that was designed to defeat Soviet Armour. We are fighting an enemy that wears only cloth and is doped up on drugs to get them through the fight. What we need is what hunters have been using for a long time.
The same loads that can drop a 200lbs Deer can easily drop a 200lbs man.
In the end... since I'm back to being a civilian. The rules of war no longer apply to me. All of my defensive firearms are loaded with the best cartridge available for it. So for my AR-15s it's either Remington or Winchester 55Gr Soft Tip Lead Load. For my sidearms it's the Winchester Ranger SXT JHP Load. For my older calibers like .45 Colt and .38 S&W. Standard Semi-Wad Cutter Lead Loads.
All of your firearms are loaded with the bullets?