A little bit oddball shooting RNs in a 243 but if you are using your 243 as a brushgun where you know the ranges are going to be short I would think it would work good. We all say we understand that the big fat brush busters are a myth, lots of tests have shown so, but then we grab our 45-70s when we leave the house. I haven't had much experience with any roundnoses, but they had a very good reputation back in the stone ages before the became almost extinct