Barrel run in day

[CINDERS]

Yep it is a quick use ruler that is done up in YDS & MTRS with other bits of information on it they are available on fleabay takes the guess work out of it goes to either 500yds or 500mtrs.

Fairly cheap $20/AU I think maybe a bit less thing is you have to look after them as the ruler can easily lose the markings not the thing you throw in the bottom of a toolbox full of spanners.