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The 300 WSM is as accurate or more so than any other cartridge in it's size range. Currently its the favorite 30 cal magnum for long range shooting. So that puts the accuracy mumbo jumbo aside.
Besides it's usually the gun and most cartridges will shoot bullets well from a good gun.
It only takes one thing to throw the accuracy off in a gun. At present the fouled bore and possible damage to it seems to be the easiest to work on.
Not sure if you used an abrasive to also clean the bore but if not do so. Get some Rem. Bore Cleaner or JB's or something. I like to put it on a cut patch over a bristle brush and not a bronze brush. You can go back and forth with it and the chemical removers.
To look for fouling near the muzzle shine a penlight down it. To see even better hold a Q tip in the bore when shining the light. (you guys thought your bores were clean huh?)
When in a serious off season test like this I try to stay with Sierra bullets.
Once the defect is found test it with other bullets but if it's the fouling keep it really clean. I too like the Outers Foul Out but just try the abrasives for now.
What make of custom is it? You might call the maker and tell the story. He might have some insight. I always suspect the crown and if that was damaged I would send it back to the maker before voiding the warrantee expressed or not.
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