I just used the .223 necked up to a straight walled .357 as the cases were free . I did a couple of bolt rifles and AR-15's . Mt best bullet was the .357 180 XTP .I went that route as the bullets were cheap and the sub sonic performance was much better than the 300 BO . For longer range the H .358 200 plastic tipped bullet work great . I did have to reinforce the stock . My friends and I have shot many pigs and a few deer with my rifles with good performance out to 200 yards .