I was just commenting on this today. F-Class >> 25+ rounds per match, times 3 matches in a day. That is A LOT of stress on a barrel. Think about this. I have as a "deer stand" rifle, one of the first 6.5 x 47s that came into the country. It wears a 1-8 twist Dan Lilja barrel. I only used it "from time to time", and never fired more than 30 rounds at a time. At about 15 rounds during a session, I would let the barrel cool right down before firing the last 15 rounds. Then I got into F-Class, and I believe I used this particular rifle 2-3 times for matches. It was not then and it is not now, built for anything but hunting. I put it up for YEARS and never shot it. Then this year I decided to get it out and see what it is capable of. So, I had some N540 on hand and got some Lapua 123 Scenars. It still shot very well >>> right at 1/2" at 100 yards. Hunting rifle, hunting stock and hunting scope >>> I could not ask for better accuracy. When I cleaned it, I "scrubbed it to the bone" and looked at it with my borescope! WHAT!!! I do not know how many rounds are down the barrel, but it has to be at or near 2000! But ONLY the very slightest amount of firecracking. An "untrained" eye, might just pass over it not capable of noticing it! That is how little there is!
Now I had several 6.5 x 47s for F-Class! I love the round! But I never got more than 2000 rounds before the accuracy fell off significantly and firecracking was substantial. "Generally" I used either a Berger 130VLD or the Berger 140 Hybrid for competition. Powders were either Varget, RL-15, H4350 or (at the time when I could get it) Viht N540. During those years with a '47, I lived in either Houston or Phoenix! Barrels do not cool down in those locales. The powders I used tend to eat barrels for dinner, especially in competition and in those locations. I never used a .223 for competition, however, I did with a 6BR. You should get 1800-2200 rounds of "competitive" accuracy! To me, "competitive" shooting means having a rifle capable of winning at a BIG competition AND the possibility of setting a national record. If your rifle is NOT capable of that due to "rounds down the bore", it is time for a new barrel! QUESTION: What is the sense of going to a BIG match with a gun incapable of winning? All you are doing is pouring expensive components down the barrel with no chance of a win. Now if you just want to go and shoot and enjoy everyone's company, that is a different story.