Hi, I was just wondering. Over the years, I've noticed what appears to be a trend. It may be only in my mind, but...... A .308 Win. seems to be most accurate at about 2600 fps. A 30-06, at about 2800 fps. A 300 Win mag at about 3000 fps. A 300 RUM, I'd guess at about 3200 fps. I realize that this doesn't take bullet weight into consideration, but maybe it does. If the bullet weight is what it takes to make the case "hit the window", then it would have a very real effect. Has anyone else ever noticed this? None of the books that I've read have ever mentioned this. Maybe because I don't know what I'm talking about. Anybody with any idea, please enlighten me. Good shooting. C'ya. John. PS. I don't mind a long response. JP.