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Double Rifles, Single Shots & Combinations >> Building Double Rifles & Gunsmithing

kuduae
.400 member

Reged: 13/01/10
Posts: 1779
Loc: middle of Germany

Re: Proof... once again
29/10/10 07:39 AM

Quote:

Considering that testing the action was the primary goal, perhaps it's just fine - however the question of loads and what load was used is also important in the equation. One man's maximum load is sometimes not equal to what a maximum load actually is - not suggesting Bramble loads lightly - but - perhaps it's all relevent, perhaps not.

European proof rules told most of the time: The man submitting a gun for proof has to tell the cartridge for which the gun is to be proofed. If it is a factory chambering, maximum pressure of the service load is determined by the CIP tables, and so is the proofload with 30% more pressure than the service load maximum. At least in Germany, the 1940 proof rule prescribed the maximum pressure of the highest pressure German factory load then available to be the max service cartridge pressure, hence the ridiculously low max pressures of some old cartridges like the 9.5x57M-Sch. But there always was an exception: For cartridges with no standard factory loads available, the maker has to describe exactly the load for which the gun is to be proofed and has to send in at least six such loads and components, perhaps even his reloading tools, with the gun. Then the gun is proofed for this load alone. Loading ammo with a higher pressure than the load submitted for proof is illegal. Remember, proof is meant to determine if a gun is safe using factory cartridges, many handloading "recipes" make the gun "out of proof" for this load and the user is on his own, without the slightest chance to sue anyone.

Quote:

I'm not sure I'd want my actions submitted to 'over 30%' more pressure than they will ever experience - in reality, my improved ctg. actions experience very little pressure - virtually. Does this 'stree' the action for future failure? If oiling a tapered round produces the same pressure increase as oiling an improved ctg. then the increase in pressure against my actions would probably be over 100% of normal - something they will never experience and have no need to.

Proof rules simply require a 30% higher pressure than the service load! If your gun shows any defect such as bolt setback or gaping, it is to be rejected. This indeed troubles the proofhouses with some new American high-intensity cartridges, as their service pressure is already so high that the prescribed 30% increase makes brass "flow" like a liquid and makes properproofing impossible.

BTW, how do you know your "improved" cartridges give such a low back pressure? Have you really measured anything under controlled conditions or are you merely guessing too? How do you arrive at a 100% increase? British experience simply state "more than 30%, likely 50%".

Quote:

I guess it works for them, the actions of the DR's being the weakest part of the gun.

I agree here!

--------------------
German foresters: We like sustainability! For merely 300 years by 2013.

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Entire topic
Subject	Posted by	Posted on
Proof... once again	oupa	27/10/10 09:50 AM
Re: Proof... once again	Birdhunter50	29/10/10 11:41 PM
Re: Proof... once again	Mike_Bailey	30/10/10 12:51 AM
Re: Proof... once again	DarylS	30/10/10 01:35 AM
Re: Proof... once again	GroovyMike	30/10/10 02:10 AM
Re: Proof... once again	450_366	30/10/10 03:04 AM
Re: Proof... once again	oupa	30/10/10 04:39 AM
Re: Proof... once again	tinker	26/12/10 06:48 AM
Re: Proof... once again	DarylS	30/10/10 06:35 AM
Re: Proof... once again	GroovyMike	30/10/10 07:10 AM
Re: Proof... once again	Brithunter	14/12/10 10:33 AM
Re: Proof... once again	DarylS	26/12/10 05:47 AM
Re: Proof... once again	oupa	25/12/10 03:12 PM
Re: Proof... once again	4seventy	27/10/10 03:41 PM
Re: Proof... once again	kamilaroi	27/10/10 06:58 PM
Re: Proof... once again	oupa	28/10/10 03:26 AM
Re: Proof... once again	DarylS	28/10/10 03:57 AM
Re: Proof... once again	kuduae	28/10/10 06:13 AM
Re: Proof... once again	kuduae	28/10/10 06:49 AM
Re: Proof... once again	Huvius	28/10/10 07:36 AM
Re: Proof... once again	4seventy	28/10/10 08:33 AM
Re: Proof... once again	kuduae	29/10/10 07:46 AM
Re: Proof... once again	4seventy	29/10/10 08:26 AM
Re: Proof... once again	4seventy	29/10/10 08:45 AM
Re: Proof... once again	DarylS	29/10/10 10:21 AM
Re: Proof... once again	kuduae	28/10/10 08:10 AM
Re: Proof... once again	4seventy	28/10/10 12:58 PM
Re: Proof... once again	oupa	29/10/10 03:31 AM
Re: Proof... once again	kuduae	29/10/10 07:39 AM
Re: Proof... once again	DarylS	29/10/10 03:30 AM
Re: Proof... once again	kuduae	28/10/10 08:43 AM

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