Although quite a lot of testing was done on my part with over 20 different rifles/calibers I used a combination of three main rifles.
1)'03 in 30-06 with AP (Surplus black tip)
This will actually go through three #15 locks "in a row" and get stuck sticking out of the backside of the fourth. "Like Buttah"
This was my fav rifle that a friend of mine still owns to this day. Damn, it is indeed accurate and a very fine shooter. Also handloaded "ball" ammo. I never missed my POA.
2) I used one of my H&K SR9-Ts in .308 with Handloaded "ball" ammo. I only shot at one lock at a time with this rifle. I never missed my POA.
3) I also used an SKS in 7.62x39. Yup, a $50.00 rifle, with a $300.00 scope on it. Hahahahahahaa. Once again hand loaded "ball" ammo. I never missed my POA.
All shooting was done at 100yds, except for the SKS which was 50 yds, and I never ruined a single lock unless it was intentional on my end. Every lock looked just like the one in the commercial more or less. The "AP" almost looked like I drilled a hole through it. It was such a nice looking hole.
The hole would get progressively smaller in DIA as it passed through progressive locks until it finally became stuck sticking out the backside of a lock. Religiously so. Neat. I only did this "experiment" to see what the "AP" was capable of. I did in fact experiment quite a bit. It got to the point where I would hang 50 locks at a time on hooks (no, not in a "line"
but on a backrest that I made, spread out
just to expedite the process.
It was a LOT of locks man.
Keep in mind that after I shot the locks they were ALL indeed still fully functional. No fooling. Key worked, open, close. "Lock." "Unlock."
Yes, there is quite a lot of shrapnel involved in shooting locks so DISTANCE is your friend. The amount of shrapnel depended on the caliber/bullet/velocity/distance used. I never was in any harm at the distances I was at. I was given a certain "surplus" of locks in order to do some "testing" with, and also just in case I did miss a few "bulls eyes".
Thanks for the interest guys. It is sincerely appreciate it. -Goodspeed