Having used a couple of different firearms for real against sundry gooks in the third world I note the following
a) You use surprisingly few rounds from a bolt action rifle. Myself and one scout were involved in a contact with about 50 russian equiped (and backed) Super Zipra (if anybody remembers them). I had a bolt action 9,3 Mauser, and my scout a G3. 12 rounds and the fight was over - we had sucessfully run away
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and they had lost at least 5 men. As a kid, we suffered several attacks on our house by gangs of both ZIPRA and ZANLA. I never once fired more than 10 rounds (I had a Bruno 7x57) when the attackers were the poorly trained and led ZANLA gooks, but a couple of the attacks by the far superior ZIPRA gooks lasted 20 minutes or so and I got through 30-40 rounds.
b) with a full auto weapon you go through mountains of ammo. I had a couple of engagements with super Zipra with a Bren to hand and three with the HB lmg version of the F.N. FAL. Got through 150-200rnds each time - but there were fewer gook dead than when I had a bolt action rifle in my hands
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c) A shotgun is a lovely defensive tool! you do not need a big mag capacity- if you have fired more than two rounds from any one possition, you have hung arround too long! We used shotguns initially for anti-poaching operations. We had a shoot on sight policy, and most firefigts were at night, and initiated by us. As the aggressors, a shotgun didn't hold enough ammo, and most of the killer teams moved onto AR 15 with samson HP ammo. I went back to humping the HB FAL, and then as the gangs got larger, the Bren.
There is a whole world of difference between offence and defence. The attacker needs supressive fire to try and mask his attack. A defender only needs to fire when there is something worth shooting. As the agressor, you need your quarry to go down and stay down when you hit him - you are closing in, you are stepping over fallen enemy - they had better be dead or too badly hurt to fight! In defence, (except if they are inside the house) it is usually sufficient to hit the enemy - .22 or a single no 4 buckshot pellet will do nicely!
A rabble do not like accurate incoming fire! They go and look for easier targets!
So on stocking up ammo? If you don't have a semi auto AR, you will need less than you think!And if you do have a semi (or full auto) rifle, you had better have some means of lugging a resupply! 500rnds of 7.62 for the Bren loaded into mags weighs 37.4lbs - ie enough for two short engagements !