Is there any truth to the claim that your fouler shots must be the same as your real loads? As in if I'm using retumbo and 200gr nabs I should use the same for foulers to run through my barrel after cleaning for example? Is using something like managed recoil (cheap and gives me brass) for fouling shots not as good as I'm laying down different copper and powder residue? Any negative effect in using managed recoil for example on subsequent accuracy of my retumbo/nab loads? I am very curious about this since it pains me somewhat to load up a nab with retumbo only to foul the barrel. Thoughts?