This may sound a bit stupid: How do you pirnt out something on word so its life size, like a l85 template for example (picture of an l85)so it prints out with all areas full size (equal to real life size) Apologies if it doesn't make sense.
The A4 on the screen is the same size a real A4, so just measure how big the receiver or something is (length and height) from your L85, then just scale the image to the same measurements
^ Can do it easily in paint. Just trim the picture so no border/white space around the L85. Then find out length of L85. Then adjust the picture size to match, just tick the box so unit measurement is cm/mm not pixels and keep the 'maintain aspect ratio' box ticked