I have some leather bullet belt pouches and canvas culling belts.

One type is the old fashioned type with a brass nipple which holds down a flap over 5 or so cartridges in a single line. I have one of these for my .375 from Galco and two of them from Westley Richards for my .450. The Galco is better made by far.

Another type for my .375, .308 and .30-06 has four rounds times 2 (ie 8) when it opens it unfolds. I have a couple of each of these as sixteen rounds isn't many sometimes. These are Galco as well and well made.

I like the first type above for dangerous game as you need to hold the second type down with one hand while extracting bullets from the bottom 'flap'. Though it can be done one handed. When hunting buffalo with my .450 and did manage to extract two rounds from the single flap type to have in reserve in my hand. The bull was facing us off at less than 25 yards.

I also have two canvas culling belts in .375 and .450 from Westley Richards. Each holds 20 rounds. Have not used them yet, but can't wait for an opportunity to need twenty rounds of .450's or even .375's. A Queensland pig hunt maybe if the drought has ever broken up there.

I would like to try a butt stock pouch as well.

I was advised against leather once in the tropics but never have had a problem with it myself yet.