I have a Stoney Point bore guide for 25-30 cal. bolt actions. I bought this one right before they came out with the one with interchangable chamber tips. S.P. guides will adjust to fit any action size and have a window to put bore cleaner w/o the worry of it getting on your stock. Like I said ,I have the older model that I bought several years ago and I have never thought of replacing it. Top quality all the way! For the use I've gotten out of mine, the $21 I spent was well worth it. The newer model is the same well thought out design with interchangable chamber tips(even better). I recommend them highly.