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They simply knew from their experince with the ammo testing gun that using the Woolwich system's oil on the cases would increase the pressure on the breech by "at least 30%".

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Increase the pressure on the breech by at least 30% of what?
In this case a handloaded hunting cartridge, supplied by the owner of the firearm, the pressure of which is unknown!

If that handload was producing less than the MAP for that particular cartridge, then the 30% oiled case increase on the breech thrust may not even be enough to equal the breech thrust of an un-oiled factory loaded round!

What they did has little or nothing to do with gunproof, nor did they adhere to the rules laid down for British gun proofing.
They then stamped the gun as being safe for a certain pressure, when they didn't have the faintest idea what pressure they had used during the "proofing".

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