While this subject is often discussed in regards to the states where we have no official or easily accessable "proof house" the norm or at least that arguably "established" by way of Brown's book is a 30% over load of some sort. I will not go into that debate right now but as this is the first such project I've done since reading it way back when, I was wondering how you guys view the method our own Bramble encountered at the London proof house. That being, simply oiling a pair of heavy (but within spec.) cartridges. I for one am certianly not going to argue with such experts but am curious if others have tryed it. Here's an excerpt from that post with emphisis added;

"...It was an interesting experience. The test itself consisting of taking two of my heavy crimp maximum reloads and librially oiling the cartridges and firing them in a test room that resembles the entrence to Dantes inferno with a huge ammount of powder residue on everything. A nicer bunch of people you could not hope to meet by the way, they let me observe all that was going on and made me a cup of tea to drink whilst wandering around their workshop.
They also decided that the test was sufficient for definitive proof and that I did not need to return the rifle after the ribs were added.

I enquired of course just what additional strain the oiling of the cartridges puts on the action and I was assured that it was in excess of 30%. I was told with some undisguised pride that the same proceedure had recently pushed a .600 by a well known manufacturer off the face. This was before they fired my humble effort (gulp). The excess pressure produced was sufficient to force the primers to extrude into the firing pin holes 0.0085" to the extent that a burr could be removed from the primer with a fingernail on examination."

And a link to the whole thread; http://forums.nitroexpress.com/showflat.php?Cat=0&Number=69065&page=0&fpart=1&vc=1