Last week I bought a Sig Romero3 Max Pro for a Smith 686 Competitor revolver. Shooting reduced load 38 special rounds I shot 300 rounds over two days and at the 300 round count the zero jumped 4 inches left and 2 inches low. I had checked the zero every 50 shots up to that point for zero and it was solid. I checked the mount and it was secure and also checked the tracking of the dot on a collimator and it tracked correctly. I am at a loss for the reason the sight failed. A friend just purchased a Trigicon SRO and had to send it back because the dot didn't work correctly which steered me away from that model. Are there any solid red dots out there you can count on?