Broken bolts- thing of the past?

[lazyengineer]

Broke a bolt yesterday. I was shooting my usual loading of 31.2grs of CFE223 under a 123 Nosler CC @2.245"

I don't know the manufacturer of the bolt. I've been using it so long I just can't remember where I got it. I have at least 4,000 rounds on it.

It has been replaced with a Monster Mk136 bolt!

[ATTACH=CONFIG]19300[/ATTACH]

Thanks for the update. I'm not familiar with the 4 radial grooves cut into the bolt body, that go around it like that. Does anyone else know what brand that likely is?