We enjoy shooting RF and have informal shoots weekly. Based on our personal experience we do make a suggestion if asked. The suggestion is to buy a CZ452 and a box of CCI Standard Velocity cartridges. I have no experience with the 455 so no comment. My rifle is the old 452 Trainer. My shooting partner shoots a 452 with the full length stock. Once you start shooting RF's there's a clear chance you'll start to accumulate.