I don't think anything is giving when the grade 8 pin doesn't shear. The lug stays in place and the barrel spins off which is the purpose of pinning the lug in the first place. When the pin shears, it's a poor quality soft pin. The advantage of a pinned lug over using a lug location fixture tool, is that you can change target barrels the same as a glued in gun without removing the action from the stock. Any time you remove an action from your bedding job and put it back in, you are risking that the rifle won't shoot as well as it did before removing it. All it takes to create stress in the bedding is getting a piece of trash between the action and bedding job when you replace the action. You can tell if that happens with a dial indicator to check and make sure your bedding job is still good, but how many are going to do that.