Was at the range with a couple of guys, leave names out for now

, and one just got a Rem 700 back that they previously sold. Trigger was very light and I thumped the butt on the concrete a couple of times, seemed fine. While at the range he drops a round in, pushes the bolt forward, and click! Wasn't even locking the bolt down, just pushing it forward. Just barely hit the primer, but it did leave a tiny dimple in it and luckily it didn't go off. After that he tightened the trigger a bit.
Anyone else ever have that happen to them?
As for my rifle, I had some great shots and some that left me like

At 200 yards had several that were laying on top of one another. Also, with a clean bore, had some that were three+ inches apart before it started settling down. Thinking of getting a B&C Alaskan Ti stock for it, hopefully help with consistency. Don't think it was my shooting either (for the most part) cause I shot one guy's M70 Extreme Weather 308 and had a couple ~1/2 groups with different loads. Sweet little gun, very accurate.
But that trigger issue, not good.