I have a quality Sauer & Sohn rifle from Germany which has a permanently attached barrel using what they call a “heat lock” process (you may know it more commonly under the name “thermal interference fitting”). It is a benefit to accuracy due to high levels of concentricity, but also means that once the throat of that barrel is shot-out then the entire rifle is kaput. No barrel replacement. Because of how it was manufactured I don’t much shoot that Sauer & Sohn rifle, even though it is the most accurate rifle I own. I hate to be limited that way, but it’s a gem and I want to stretch its usable life for years ahead. That rifle also led me to learn more about barrel life. It’s an interesting topic. Consider for a moment that if you’re lucky enough to have a barrel maintain accuracy up to 3,000 rounds, you have really only exposed that barrel to just six seconds of shooting. That’s because it takes a typical bullet only .002 seconds to pass down the length of a 24” barrel (according to scientists at Lawrence Livermore National Laboratory). Of course, every rifle will be different based on calibers, charges, bullet grains, barrel lengths, cleaning habits, etc., but you get the idea. If you have a magnum rifle, say something like a 300 Win Mag, accuracy probably won’t last 3,000 rounds. Probably more like 1,000 to 1,500. On the other hand, if you have a 308 Win using 180-grain factory ammo, heck you may be lucky enough to stretch it out to 5,000 rounds, maybe even 10,000 rounds! That would be all of twenty seconds of shooting impact on the barrel. Barrels cost money (they’re getting expensive, aren’t they?) and down time, especially for match shooters, so predicting barrel life is something many people have attempted. Look around the net and you’ll find different “overbore” spreadsheets people have created for that purpose. Having a bit of geek gene myself, I decided to build my own predictive model using the following factors (not including twist rate... should I?): ֎ Caliber ֎ Bullet grains ֎ Powder type ֎ Powder charge ֎ SAAMI max psi ֎ Bullet coating ֎ Bullet material ֎ Barrel length ֎ Barrel material ֎ Barrel treatment ֎ Kitchen sink (sorry, couldn't resist a self-deprecating joke) Since it is an intuitive number, my goal is to have a score of 100 serve as a threshold. Barrels below that score are the ones that last longer, above that score and barrels burnout more quickly. It’s all guesswork, of course. I’m still in the process of building the model, and for all I know it won’t be worth crap on a bun, but what the hell, it’s a fun exercise. Once I get some results from the model I’ll post for y’all to see and let me know if it really is just pure crap or something helpful. Thanks.