It's bollocks mate :11: That's for rifles only, bigger the calibre the bigger/more suitable* the land needs to be.
The SGC application progress isn't that much hastle mate, they'll probably ask you what you want it for i.e. vermin control/game shooting/clays etc, but it'll be no problems if you have permission somewhere. I was 15 when I did mine and did all the paperwork myself apart my dad signing it so you shouldn't have any problems.
*I.e. lots of good backstops
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How come you were allowed to use your dad as your referee? As far as I'm aware your ref