Trigger Pull Guages.

[himurax13]

Hello, all. I purchased a Lyman Electronic Trigger Pull gauge a while back and I decided to test out all of the guns that I had trigger work done on recently. I was shocked to find that the difference between what was written down to what I measured was over a pound. Now the trigger pull gauge in question is an RCBS Premium Trigger Pull gauge. Do these things need to be recalibrated often or are they just not as accurate as an electronic gauge? To make sure, I sent my Lyman gauge in to be recalibrated and Lyman said that it was well within spec.

[swifty]

Scales come in several styles. Digital, spring and dead weight. How the scales are used can give a different reading, pulling fast or slow, direction of pull, overtravel pulls and consistency from pull to pull. Location of the bar on the trigger can change the amount of leverage needed to disengage sear, varying amounts of lubrication such as flowing oil can change resistance.

The scales also have their range of use, the increments they are capable of measuring, dead weights are typically in 1/4lb increments etc.. Digital and spring scales have their specifications. Lyman may tell you what their specs are if you ask. When you add the variations and the stacking of errors, you just might be able to get a pound variation very easily.