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In my experience 00 buck is reliable to no more than 20 yards even then the 9 pellets have spread out so the pattern has some pretty wide holes. Yes it will work at greater range as that 303 sized...

Pump action remy with no 2 or bb and an evil black gun was a good combination in plantations. A pump is the safest, you can drop it on a fired chamber and unshoulder the rifle when they break cover...