I have been working on a couple different loads and somebody made a suggestion and I'd like some input. I am working on 300 WinMag loads - Accubond/H100 and Grand Slam/H4831SC. I have been working these up independently of one another and I shoot them at the range on the same day. Somebody suggested I should clean the bore and then only shoot/develop one of those loads at a time. He suggested that shooting two different bullets and powders in the same bore may negatively impact load development. He suggested I clean the bore then only shoot one of these combinations and that if I want to shoot the other combination, I should start with a clean bore. I guess he is saying if you don't do that, you contaminate the bore with fouled powder which could negatively impact your results. Does what I am asking make sense?