I always dope mine up good, use a q tip to clean up whatever makes a mess and only "finger" tighten it with the tool. It tightens up when you shoot. If its still frozen, pull the barrel off and use a propane torch and heat up the outside breechplug area. Once enough heat get to it, the plug will come out fairly easily. Just make sure the rifle is unloaded before you do the heat trick. 250 or the 300 will work great on deer. Ive used 245 powerbelts on deer and dropped them in their tracks.