If the 7mm/300 WSM had a radically steep shoulder I MIGHT believe the throat erosion would be reduced. The small difference in case capacity between the standard 7 WSM and this wildcat are so small that there would be no way to prove any wear differences.
At least you have a way to size the brass with available dies. You will still have to buy reamer unless you found a gunsmith with one.
Seems like alot of work for nothing.
