So, if you're born on a farm you have an innate ability to be able to use ANY gun, even though you haven't had any interaction with then - bar firing a shot gun once? As far as the bolt is concerned, you have to KNOW WHAT IT IS and what it's used for otherwise it's just a thingy!
I have spoken to several people who are members of shooing clubs they said just seeing a .22 being used would be enough.
I don' remember saying any gun I thought we were referring to the .22 used a WHF don't get like Adam, a gun which I have heard people say can be used by a child.
How many times would Sheila have seen Bamber, Nevil or AP push a magazine into a rifle? there were guns all over the place Nevil obviously trusted JB with his life to be so careless!