The bore has not been scoped, I believe the round count is 357 on this rifle.
If you shot all 357 rounds on a single afternoon, the barrel might be suspect, but over a five year period it's not likely much more than broken in. Unless your loads are well above max, the brass is also not a likely culprit.
I have played with a couple of Weatherby's for a almost 20 years. They belong to a friend. One is a .257 Weatherby custom job with a Douglas barrel and Sako action in a quality synthetic stock, the other is a .300 W original made in Germany with a classic Weatherby walnut stock. Both were exceptionally accurate, until a couple years ago. They went from MOA to 4-5MOA shooters. After asking a couple questions, it seems he had started using Frog Lube on the bores.
He was never a religious gun cleaner, and typically pushed a couple patches of Hoppe's down the barrel after each season. Somehow the combination of minimal cleaning and the Frog lube was a non-ideal mix. A thorough cleaning and they both returned to normal.
It wasn't the first time a good cleaning had "fixed" an accuracy problem for me.
