Anyway, enough boring stuff about anti's. Here's a useful guide we published in the magazine a couple of years ago. If you print it out at 100% (46cm wide), you can stick it on the wall and mount your gun so the muzzles almost touch the paper. The birds then appear the correct size in relation to your muzzles - and the arrows show the correct amount of lead needed at various speeds and ranges. Fascinating stuff - but remember to keep the swing moving after you pull the trigger, or you'll still miss behind!