If the speers Don't have a cannelure to crimp into you will have to single load for a lever gun. For that application I'd use cast bullets like robs 150 gr with 8 to10 grains of a pistol powder. It will give about the same speed as a supersonic .22 and have much better penetration and be quieter on the dogs and your ears. If you need to they are quite capable of bigger things out to the limit dictated by the sights.
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