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It is best to slug your individual barrel. Theoretically every 40 S&W barrel is .400 at the grooves but in reality a lot are plus or minus a thousandth or two. Did you buy hard cast lead bullets though? Don't try to force one of those down your barrel. You will want something like pure soft lead and oversized as well so you know it sized down.
How is the accuracy or the reloads you made? When I have shot truly undersized lead bullet I've gotten key holes and 8+ inch groups at 25 yards. When I've shot properly sized lead bullets that were too hard the accuracy was fine but there was leading. Virtually all .400 lead bullets are hard cast, which in itself is a "one size fits most" type deal. Bullet makers would rather sell a bullet that is too hard for most than too soft for some.
For leading I'm currently using a copper brush and Remington bore cleaner.
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New gun, same ol' shot.
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