gdnagle
US Veteran
I have more than one safe (no pictures allowed or requested in this thread).
I use 4 floor anchors and 2 side anchors. I upgraded my alarm system to cell (phone) notice (it's $3 more a month) and avoids cutting the wire to my land line alarm. It has a $150 camera to my computer.
I have nothing of value compared to the Registered Magnums around here. They are still special to me with 30 years of accumulation.
I am also a FFL 03 (fully posted):
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I'd suggest making them as secure as you can with good records so they become "hot" quickly. JMO.
I have these posted also. They look impressive to others but will not stop a thief from getting what they came for. Not like they are going to sell the firearms legally.
A safe will keep a honest person honest and a grab and run thief from getting what's inside. A determined thief with time on their side will get what inside. Now as for your question you may want to use grade 8 bolts which would have a tensile strength of +150000psi and most of the others will have less then 100000psi. If you have to ask which to use then use the biggest you can get through the holes. As for the hockey pucks will they compress after time with this major load on them and if so you will need to be able to retighten the bolts with time.
Now this is on it's side but standing up it might take a few seconds longer. This is not one of the high dollar safes but a common type.
https://www.youtube.com/watch?v=B8ViUdd-2LM