pcammo, I have 237 rounds through my custom that has zero freebore. The leade has grown .032 in the 237 rounds.
I bought a 257 German Weatherby from a guy in the late 80's. I was at the rifle range on a Sat, this guy was hammering the rounds down the 257 Weatherby like he was fending off a Bonzi charge.
I could see his frustration and finally asked him if I could be of any help. He infomed me that I could buy the rifle from him, that there was no way to get the rifle on paper. I asked him how much he wanted for it and he said $500 with all the ammo he had and empty brass.
I told him that he needed to keep the barrel cool and that if he cleaned the barrel and got all the copper out of the barrel that it would probably shoot at least 1 1/2 inches, which just made him mad. I asked him if he would take a check, he said YES!
I cleaned the barrel and loaded 72.3g of R#22 with it with a 100g Sierra and the gun shot three shots 1" at 100 yards, I bore sighted the rifle.
I tell this little story because many people that have bought these "hot rods" have no idea that they ought to keep the barrel cool as they shoot, and just like the idiot that I bought this gun from, they have no idea how to clean a rifle which gives the caliber a bad name.
I would expect from the throat wear that I have in my rifle that a person that exercises reasonable care as a hunter that checks his zero every year, that he should get 900-1200 rounds out of the barrel. The guy that does not know how to really clean his rifle would probably get 300-450 rounds out of his barrel. That fouling gets cooked in the barrel so hard that nothing can get it out.