Of course...it's obvious when hunting {even according to Maryland law} --- never prop your firearm up against a tree or car --- with the muzzle up or down. Some dog can trip over your gun, or having the rifle or shotgun, slide off the metal of the car --- possibly causing an unintentional discharge.
I had a polite confrontation at our gun range, {a few months ago} with a member who insisted that the muzzle of the rifle should be pointed down while going to the gun rack --- and being placed muzzle down on the gun rack.
I showed the member the written rules of our gun range...which stipulated: "that all guns must be pointed upwards while in the gun rack" but the rules did not explictly state --- that the muzzle should be pointed upwards while in the gun rack.
The member told me that he was going to follow the way he was trained in the military, and not the written rules of our gun range. The member was training his two approx. 10 and 11 year old sons to do the same thing.
So I went to the president {AGC} who was sitting at a table in our range house; along with a copy of the written range rules. The president was sitting with a few other senior members of our gun range.
The member --- who I had a safety disagreement {muzzle down} with --- followed me in --- and accused me of verbally harassing him and other members caused by there {so called} misuse of safety rule's
The senior member's told the member the advantages of keeping the muzzle up. But again he insisted ... that he was going to follow the way he was trained in the military.
The president...probably thinking the best way to avoid a confrontation --- told the member to do the way he {member} thought was the safest way.
I walked out the door, packed my bags, sleeved my gun's, grabbed my target during the ceasefire, called it an early day and drove off in my car.
I saw the member again, a month later, and he proceeded to rack his guns with the muzzle down. I performed another early departure from the range; without saying a word to the member.
I talked about the event with a former military contractor who was staged in Iraq, and yes, he told me, "that's the way they trained the military --- with the muzzle down --- because the general's were usually upstairs in a house, and they did not want there tails blown off. Also...they keep the muzzles down in helicopter's --- so as to not blow off important engine parts in case of a negligent discharge."