I was just not 10 minutes ago going to anneal 292 pieces of .300 BO Brass. I have an Annealeez Machine that has been great for the 2 plus years I have owned it. But when I went to size up the machine for the .300 BO brass, I got worried about melting the sponge wheels seeing as the brass is so short. I am not annealing this brass for accuracy sake. I am annealing this brass to get more life out of it seeing as it is such a pain is the balls to get for the past couple years. Thinking maybe a set of the small sponge wheels are in order here. If you do anneal your .300 BO brass, check in here. And if you do it on an Annealeez machine, LMK if you are using the stock wheels, or if you purchased the small wheels (If they are even existent. I haven't checked yet).