Originally Posted by
Blackelk
I don't understand this issue. Many 22WM and 17HMR rifles from manufacturers do not have this added feature? Are they going to start drilling vent holes in center fire rifles for bore obstructions? Haha good luck with that. I would suggest not putting your finger over the hole plugging your barrel and testing this.
This is probably lawyer-driven. Many of the centerfire rifles I own have a vent drilled into the receiver or bolt to vent gases away from the shooter in the event of a ruptured case, but I also have a number of centerfire rifles that don't have this feature.
I'm guessing that somewhere in the plans for the American Rimfire Magnums is that there's to be a vent hole, whether it's needed or not. If they let anything out of the factory that doesn't look like it met the specs of plans the company uses, and someone gets hurt, that's one of the first things they'll look at.