Chambering

[Keith Glasscock]

Sorry to be so long in reply.

The action shown is a coned bolt, but instead of the 3 rings type of sealing, the action uses a tight fitting bolt body to seal the rear of the action. The locking lugs do not extend out the sides of the bolt beyond the body, so the action has no room for gasses to move easily rearward. Instead, there is a vent on the left side of the action that relieves the pressure.

You will note that the tip of the extractor is gone. The design of this action prevented that piece of steel from being projected rearward to the shooter. As a matter of fact, I found it still laying inside the action after the event.

I posted this to show that even the best shooters, shooting conservative, safe, published, normal loads can have failures not attributable to handloading technique or charge determination. I believe that this piece of brass had something about it (like a weak spot) that caused the failure.

Bad things happen even to the most careful. The goal is to make certain that the event is not injurious to the biological portion of the shooting system.

I'm glad you decided to stay with the original design. Safer is always better.

 

[ridgeway]

Either one of these work great for a Remington counterbore or cone...

The first one is probably like the one tclaunch mentioned. I got mine off eBay for like $20 The Grizzly on the other hand, is quite expensive. Will have $200 into it once you buy the bar and inserts. The nice thing about the Grizzly is, its long and a min bore of .236".

 

[Tzed250]

The counterbore is like the seat belts in a modern car. The airbags might protect you adequately in the event of an accident, but your chance of coming out uninjured goes way up if you wear your seat belt.
Buckle up..