I agree with this method/device...I have used this in the past when I declared my firearm, and had zero problems with this method...Your milage may vary depending upon the discretion of the ticket agent and the TSA at that particular airport...
I have never been subjected to any additional scrutiny or special screening...The ticket agent gave me the slip of paper, usually a nifty little sticker that attached to the safe and we locked it up, placed it back in the piece of luggage, and I locked that up with my own lock and away it went...I do not know if the TSA even screened the luggage after that, as I was not called to come and unlock the suitcase after I checked it in...
As far as ammunition, I packed the unloaded and separate magazines (3) in the bag outside the safe, and the ammunition NOT in the manufacturers cardboard box, I packed those rounds, and only the rounds for a complete magazine loadout in a plastic, segmented per round reloaders container...A much more professional and rugged container in my opinion...Since I carry a .45, it was only 25 rounds 9, plus two 8 round magazines...And since it was only for self-defense, and not a competition I was going to, that was it...
I have only had a couple of incidents that were reported to the TSA about the whole "handling of the firearm" bit...These folks were hopefully re-trained and explained that their actions wre incorrect and against TSA policy...
For the most part, I have had no problems flying with a declared firearm for this purpose...That has been on Southwest, Delta, and AA...United (I recall from past experiences) did have the most squeemish ticket agents, which I believe extended to the TSA on those particular trips...But we got thru them ok...Eventually...
I would also carry a few extra zip-ties, to lock the action back in the case of SA's if you carry those types of handguns...You zip-tie them back before they are viewed by the ticket agent and TSA, if it ever comes to that, and if they somehow break those zip-ties, you have a little more horsepower to take issue with their "handling" of your personal property when they do not have to...And are not supposed to, per their own rules and regulations...
Also, be cool about all of this, show no reaction to their personal opinions and statements regarding your capabilities and or reasons for flying with these items...Give them NO excuse, in any protesting reaction to their input, that would justify their opinion of you and the rest of us...Most people in this process are not a problem at all...Some would try, go out of their way, to get a reaction out of you...It depends on where you are for the most part...You have the right to remain silent...Not that you are in any trouble at all for doing this, you are following the rules, and they know this...
Just thought I would relate some of my experiences on this issue again...
Ohhhh, and make sure you take a printout of the state you are visiting (handgunlaws.us), their research on the rules/laws on the use of deadly force in other states, and the "go, no-go" places as well...We've learned that some states have different rules regarding that aspect of the CCW laws, and it should be expected that we have knowledge and abide by their laws when we visit...I proves that you are a great ambassador for the CCW community and the Second Amendment in general...And that IS what we should desire to accomplish and succeed with this issue...
Overall, have a great, and safe trip!!!