No offense intended. Just clarifying the situation. It's technically a centerfire rifle, yes. As far as the bullet's velocity is concerned though, which is what matters, it might as well just be a standard 9mm target round out of a pistol and that's even if he's using high end HP defense rounds, which is doubtful. It's standard practice to shoot center fire pistols at steel at 7 yards.
From
Gong-Shot.com manufacturer of steel gongs.
Minimum recommended shooting distance with a handgun is 15 yards. It is always better to shoot from farther away and move in closer while checking targets for impact damage.
This is where I'm at. While 15 yards may be acceptable, under a perfect scenario, we do not know what the scenario is. If 15 yards is minimally safe, why not back off to 25? My standard 38 125 JHP loads that run right around 900 fps outta my Smith 637, run just under 1300 fps outta my Rossi M92 lever. I would't shoot the Rossi @ 7 yards with that standard .38 ammo, even tho you say it is safe, cause again, I prefer to error on the safe side. Standard practice to shoot centerfire handguns @ 7 yards? Who's centerfire handguns? While I might shoot the 637 @ 7 yards, I certainly wouldn't shoot my 686s, 629s or the X-Frame at 3 times that with standard loaded ammo. Type of bullet, angle of the steel to the shooter, type of steel and condition of the steel are all just as important as velocity/caliber when it comes to safely shooting steel. You want to assume all of the above in the best case scenario, but me, I consider the worst case scenario when it comes to shooting safety. I'd guess the OP's scenario is somewhere in the middle. I have 4 stations of Steel Gongs set up at my personal range. 40, 80 120 and 200 yards. Handguns, regardless of caliber, are never shot closer than 40. If my grandkids or others, can't hit a 8" gong @ 40, I hang a 12". Safer IMHO, than a 6" @ 20 and just as easy to hit. While is safe with frangible bullets at any distance when using the right target, target stand and proper PPE, one needs to consider what is really being used. WallyWorld FMJs at scrap yard steel hung perpendicular to the shooter, not so much.
Again, not chastising the OP. What he did was great and the smile on his little Girls' face is testimony to it. My suggestion was only to keep her safe and to keep her challenged, in order to keep her loving to shoot. Over the years I have seen a single negative experience by shooters at a young age, reduce or diminish completely their love of the shooting sports. I have seen kids that got rained on with shot pellets during duck season, never go again. I have seen kids who shot a gun that recoiled too heavily or did not fit them properly(one reason I suggested youth stocks) and thus they got a stock to the nose/scope to the eye, scared to even try and shoot again and if and when they did, had a 'ell of a flinch.
Like you, I am not intending offense, just clarifying my position.