Bramble
(.375 member)
12/02/07 06:48 AM
Re: Proof loads

I should like to add to this thread my experiences from the London proof house last week.

There are apparently three methods.

If the cartridge is current and common, they may have an assembled proof load in hand.

For my .450#2 they did not and I was asked to bring primed cases and heads into which they were going to assemble a proof load in blackpowder. However they only do this with lead bullets.

When they discovered that I had Woodleigh solids they decided to use my service load which was near maximum and they took the cases and oiled them liberally before firing the rifle.

The rifle was fired with the foreend detached.

Both barrels were loaded alough they were fired one by one.

The examination before and after was visual and physical. Checking that the rifle was on face, examining the bore and chamber.

Immediatly after firing the technicion removed the rifle from the chamber and before opening it held the breach up to the light to check for any gap opening between the barrels and the action face. He then opened the rifle and removed and examined the cartridges remarking on the ammount of primer extrusion indicating the pressure levels. Both primers were volcanic in extrusion and one had a burr forced up that I could remove with a thumb nail. He examined the chambers and the exterior of the barrels. No measuring equiptment was used.

He did remark to me that a similar process had knocked the .600 from a major manufacturer off the face just a couple of weeks earlier.

My rifle was stamped up as proofed to CIP limit of 3500 BAR.

My 6mm BR Norma Ruger #1 was proofed to the same method at the same time using my Lapua factory rounds again because of the relative rarity of the round.

Hope this information helps somebody in the future.

Regards



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