Calculating Length of Pull

[Shed tuner]

No, you don't, you'd have to be a flippin gibbon to be able to reach the trigger and get a straight-back press with nearly all HWs. Some of the old 50s are OK, the 55 and the thumbholes, but the rest of them are ludicrous. The HW35E is egregious.

So. I am normal ?

[Hsing-ee]

So. I am normal ?

Well within the normal spec for a human hand. If you had a hand with a forefinger long enough to use a HW trigger properly, when you used a normal pistol the trigger would be between the knuckle and the first joint. I'm going to measure it now.

I take size 7.5 gloves, which is average for a bloke, and the trigger on the HW35 is 1" too far forward. It should be where the rear of the trigger guard is, with the rest of the hand in the correct position on the pistol grip.

This means that a person would need hands with a 4" fore-finger, which means a size 9.5 or 10 glove size. They don't even stock those in the NHS. You'd likely be 6'5". So the 35 is actually designed for tall Dutchmen.

[KWK1]

I guess if you tried a Custom Stock and found it too long, they could shorten it for you. Likewise, butt pad spacers could increase it relatively simply. It’d probably get a bit complicated (and expensive) for CS and the likes to offer a fitting service.

They come with a thick ventilated recoil pad. A thinner pad can be fitted

[Bellycrawler]

I have a large variety lop with many different rifles air & powder, it's never bothered me but with shotgun it makes a big difference if the lop isn't correct.

[4end]

It’s for air-rifle. I mentioned the London gunmakers who fit shotguns because they’re the ones who take greatest care over this parameter. While LoP is nowhere near as critical with a rifle, having a good fit is going to make a small but real difference particularly with a springer in terms of consistency.

Just seems to be a matter of trial and error so I’m none the wiser.

LoP is super critical on big game rifles in the larger calibres because they can recoil violently. If LoP is too short then there is a distinct possibility that when the rifle is fired, the shooter's thumb knuckle will smack the shooter in the eye. I have seen this happen with big bore muzzle loading shotguns where the shooter learns not to wrap his thumb around the grip. The old BSA underlever guns used to be stamped with LoP at 14&1/4 inches which is still around standard today.
As to fitting an air rifle stock, it could be difficult as stocks are bent with heat to fit dimensions, Walnut on a shotgun will bend reasonably easy but I have never bent a beech one and would imagine the beech is too dense for normal stock bending but could possibly be done with steam as furniture is.
With a bespoke shotgun there is no trial and error as the stock dimensions are predetermined with a try gun to fit the customer and to ensure the gun shoots where the shooter is looking when the gun is mounted.