Wheeler Engineering trigger pull gauge

[Joe A.]

The instructions for my Wheeler Engineering trigger gauge states to use a slow steady pull when measuring. When I do that, it records a heavier pull than when I use a smooth deliberant pull. Usually a 1/2# or more difference. Using a smooth deliberate pull (similar to an actual trigger pull) i get +-9 pounds. Using the recommended slow smooth pull, I get 9.5# or heavier pull. Maybe I’m pulling too slow.

Would anyone have an explanation for the difference? Which method would you think is more correct?

That’s on my new CZ PO 1 Omega.

Thanks

[Wobbly]

The difference between static and kinetic frictions might explain a lot of it. If you go too slow, you could get into a static friction situation, and static friction is always higher.

What you want is to pull slowly, but at a constant rate; not a stop/start type of pull. It might be possible to devise some type of simple machine to do this. A drum that would spin at 1 RPM ? Use the opening of the rear door of your mini-van working against the "air spring" shocks ? The weight of a jug being filled with water at a specific rate ?

Fasten the gun and have the other end of the gauge pulled on by this "machine".

[bonj]

I have a lyman gauge that when pulled slowly, accurately measures  a ten pound test weight. If I pull it up faster or more deliberately, it measures high, way off the gauge. I suggest you do the same, if you have a known weight object and a weight scale.

[Joe A.]

bonk, my gauge is right opposite. Pulled slowly, it registers a heavier pull. When pulled deliberately, it registers a lighter pull.

What wobbly said makes a lot of sense and helps understanding.

Thanks for the replies.

[Earl Keese]

I think a check weight is the way to go.