Originally Posted by philny1
I certainly don't plan on trying out a 338 Rum in my new rifle. Can't help but wonder about the out come if a round should mistakenly find it way into the chamber.
I will be using a Rem 700 receiver, so maybe it won't fire.
With the headspace off by .090" I don't understand how it would/could build excessive pressure. Of course I could write a couple books about what I don't know about these rifles.
Chances are with your 700, the ejector would keep the primer far enough forward to prevent the firing pin from doing its job.
Headspace, is simply the tolerance assigned to a caliber, typically the dimensional difference between an unfired cartridge that is of spec and the chamber dimensions, that the reamer cuts, is about 3 thousanths of an inch.
Having 90 thousanths of an inch will not "control " the "explosion" that occurs when a cartridge is fired.
In a normal chamber when the cartridge is fired, the "explosion" ( proper terminology is, the rapid expansion of gasses caused by the burning of the confined propellent) is contained by the steel of the barrel and action, the control is produced by only allowing the cartridge to expand a few thousanths of an inch before the brass casing is confined by the tolerances of the action/barrel making the path of least resistance, the bore, the easiest way for the expanding gasses to travel, thereby pushing the bullet down the barrel.
When you have too much tolerance, or too little for that matter, uncontrolled pressure spikes occur, so instead of the cartridge creating 50000 CUPs for example without the contol of the confined space of the chamber you can easily get double that, which normally results in a catestrophic failure, or FUBAR.
Not sure if my expanation makes total sense, but hopefully you will get the idea.
I build guns far better than I can explain them.