What I read here tells me one thing:
Stop Worrying, Just Learn To Shoot, You Moron.
When seated, I can, without any noticeable discomfort, get into a position that aims at a target between -15 degrees and +15 degrees, and -30 to +35 doesn't really feel uncomfortable too.
Aiming level feels like it comes naturally. Also, when I check my spirit level, and then put my cheeck to the cheek piece, I can pretty much work out whether the rifle is level.
When standing, the tolerances are narrower, but that was to be expected.
It probably helps that I do not have to work around a lot of belly. It *may* also help that, what with me having been raised on a spring gun diet, I shoot in the overarm position. In this position, it is merely a matter of playing with knee height to find your aimpoint.
I will therefore stop worrying, and concentrate on re-learning to shoot.
Thanks all for your help - it really worked.
The Filthy Pig
: Air Arms 100 (1990) + AA Olympic trigger + Welham reg + Custom Shop CS1000 stock. Status: leaking.
The Unknown Quantity
: AA EV2 Mk4. + BSA Platinum 10-50x60 + Jon Harris wheel. Status: sorted up to 25 yds.
The Limping Dog
: Air Arms Shamal (1989) + unknown origin sporter stock + Optisan Cobra 3-9x42. Status: slowly leaking; needs work.
: HW97k + Venom Lazaglide. Status: working just fine; needs scope.
with apologies to NJR100