It happens all the time and it would only be considered an issue by someone with a contemporary mind set. Some folks try to cheat the rammer hole toward the sideplate to avoid it but as noted above it's no issue at all unless the hole wandered toward the lock side and the spring is intruding halfway or more into the hole. I've not only seen it commonly - in fact, more often than not - in antique rifles, but I've seen quite a few antiques with a combination of wide mainspring and big barrel breech, necessitating filing or chiseling into the barrel breech to allow clearance for the spring. Apparently, the spring strength and integrity was considered more important than excess metal at the breech.