There is no problem re loading for any gun that I know except rimfire cases like 22s if you have good cases and the right equipment. Even with ammo shot from a glock with heavy loads you can run your 40s through a bulge buster from Lee and the problem goes away.
That doesn't mean the brass hasn't been over worked, but you said target loads which to me mean low to mid range.
Pull the barrel out of your Smith and use it for a chamber gauge. Drop a factory round in there so you know where the head of the case stops in the back of the chamber.
When you are loading your 40s, you should be able to drip one in there, have it land in the same place, and it should fall right back out.
If you have to help one in and back out by pushing on it, something isn't set up right or the brass needs to be culled, regardless of what it was shot out of.
Set your dies up, make a dummy round and drop it in the barrel.
You can find your max overall length you can seat to by doing that also but only for that particular barrel.
If it drops right in and you have to push it back out chances are the bullet is seated to long, You should see rifling marks on the bullets if this is the case.
If you didn't get any bulge out of the case during resizing, or didn't get all the flare out of the mouth, the case won't fall in the barrel the whole way.