back up for what? what's the primary? if your using dogs you won't need a backup. secondly use a primary that WILL get the job done and not might get it done. myself used a 12gauge with remington 3" sluggers and have done an excellent job. they go down and and never move again and it does it quickly too which is good. have seen other use 45acp and it just pisses them off. you'd be suprised how tough they can be, they have a tough shield and clot quickly.
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