Consistently.jeager106 said:Yes it's safe.
You didn't ask but I'm going to say it anyway.
With utmost respect and no unkindness intended but if you are going to use that rig for deer then for Pete's sake shoot it at the max range you might shoot at a deer and determine you have the accuracy to put that anemic little slug into the kill zone.
The .410 slug is a poor round for game the size of deer.
I would keep ranges very short and be certain the ineffiicent little slug can hit the kill zone with certainty.