The method described by Dillinger has long been accepted as a quick and dirty method for ascertaining a shooter's required length of pull.
Thirty five years ago, my mentor told me this was a valid system if a person shot his rifle from the crook of his arm. That was a little harsh but in truth, the method doesn't take a lot into account.
For instance, I am long armed (35 inch sleeves) but I am relatively narrow shouldered . I get away with a much shorter length of pull than would be indicated by measuring my arm. A friend is slightly shorter than I but has wide shoulders and tends to shoot across his body. He is more comfortable with a LOP which seems too long, to me.
Other factors which have considerable effect are the shape of the grip, the location of the trigger in the guard, and the type of shooting anticipated. A prone stock is usually a bit longer than one for off-hand use, for instance.
When I am trying to figure how long a shooters stock should be, I usually have him shoulder the rifle and hold it comfortably with his eyes closed. If his thumb is closer than 1/2 inch to his nose, I'll recommend a longer pull. If he is well back from his thumb, I might recommend a shorter pull. At the same time, I can check to see if he naturally cants the rifle (most do) and I can cheat a bit when grinding the pad to compensate for this.
The crook-of-the-arm measurment remains a decent means of performing a quick check but not always a means of determining ideal pull length. GD
Hi maybe you can help with this I have a Benille Super Nova Pump which I love only one problem I find it a little to long . I gave the shot gun to the Gun Smith to fit for me . but with out a wooden stock . he could do nothing for me . he wanted to cut the butt down to shorten the trigger pull how ever I did not think this is the way to go about it . any ideas ?