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Shooting & Reloading - Mausers, Big Bores and others >> Big Bore Rifles

DarylS
.700 member

Reged: 10/08/05
Posts: 26977
Loc: Beautiful British Columbia, Ca...

Re: 416 ruger popping primers
05/02/11 02:52 AM

Badly fouled/coppered bore - perhaps hot as well = pressure jump. Hot ammo - sitting in the sun can increase the powder temperature to where it developes extremely high pressures and then pierces primers. The Ruger is a modern high pressure round that is developing well over 60,000PSI- maybe 64,000SPI - probably. It is a small step upwards to where primers 'pop'.

I suggest you remove the bolt and inspect it and the firing pin's nose carefully. When primers pierce, a jet of extremely hot flame plays on the tip of the firing pin and around the pin's hole on the suface of the bolt face. This jet of flame is like a miniature cutting torch.

This flame can roughen, cut away metal and sharpen the pin's nose which then increases the chance of piercing normal pressure loads. Too, the bolt face can be badly cut by the gasses as well, which can cause primer cup extreusion into the cuts which increases difficulty with rotating the bolt to extract cases. It sometimes takes very few 'pierced primers' to do this much damage. Sometimes only one.

I've seen a blown primer cut a narrow groove all the way across a bolt face. You would think only the softer brass would be cut - not so. The culprit was a rough and slightly pointed pin in an old 98 Mauser action, re-barreled then test fired. A factory .30/06 load pierced the primer.

Sometimes faulty primers get past quality controls and are sold or loaded by factories. I've seen it happen a number of times with small rifle primers. Faults can run from too-soft cups, to too-hard cups and everything in between.

That some ammo pierced while some didn't, points possibly at the primers as both loads would have been loaded to the same factory levels. The ammo can be the same lot, but the primers might not be, just as the powder might not be.

--------------------
Daryl

"a gun without hammers is like a Spaniel without ears" King George V

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Subject	Posted by	Posted on
416 ruger popping primers	bigjedd	24/01/11 08:35 PM
Re: 416 ruger popping primers	Rule303	02/02/11 09:15 PM
Re: 416 ruger popping primers	bigjedd	03/02/11 08:27 PM
Re: 416 ruger popping primers	Con	04/02/11 06:06 AM
Re: 416 ruger popping primers	bigjedd	04/02/11 07:26 AM
Re: 416 ruger popping primers	FATBOY404	04/02/11 03:14 PM
Re: 416 ruger popping primers	bigjedd	21/02/11 06:45 PM
Re: 416 ruger popping primers	FATBOY404	21/02/11 07:09 PM
Re: 416 ruger popping primers	bigjedd	21/02/11 07:47 PM
Re: 416 ruger popping primers	4seventy	23/02/11 10:37 AM
Re: 416 ruger popping primers	Con	22/02/11 04:15 AM
Re: 416 ruger popping primers	DarylS	22/02/11 11:33 AM
Re: 416 ruger popping primers	bigjedd	04/02/11 05:02 PM
Re: 416 ruger popping primers	FATBOY404	04/02/11 07:20 PM
Re: 416 ruger popping primers	DarylS	05/02/11 02:52 AM
Re: 416 ruger popping primers	Paul	23/02/11 12:52 PM
Re: 416 ruger popping primers	DarylS	24/02/11 05:21 AM
Re: 416 ruger popping primers	Con	24/02/11 09:29 AM
Re: 416 ruger popping primers	bigjedd	24/02/11 01:03 PM
Re: 416 ruger popping primers	bigjedd	24/02/11 01:19 PM
Re: 416 ruger popping primers	bigjedd	24/02/11 01:20 PM
Re: 416 ruger popping primers	4seventy	24/02/11 01:28 PM
Re: 416 ruger popping primers	bigjedd	24/02/11 01:33 PM
Re: 416 ruger popping primers	DarylS	25/02/11 05:14 AM
Re: 416 ruger popping primers	86thecat	19/03/11 05:15 AM
Re: 416 ruger popping primers	DarylS	19/03/11 08:41 AM
Re: 416 ruger popping primers	bigjedd	19/03/11 09:20 AM
Re: 416 ruger popping primers	bigjedd	06/07/11 08:40 AM
Re: 416 ruger popping primers	4seventy	24/02/11 02:23 PM
Re: 416 ruger popping primers	4seventy	24/02/11 09:03 AM
Re: 416 ruger popping primers	500Nitro	24/02/11 05:37 AM
Re: 416 ruger popping primers	bigjedd	24/02/11 07:15 AM
Re: 416 ruger popping primers	bigjedd	24/02/11 07:50 AM
Re: 416 ruger popping primers	4seventy	24/02/11 08:07 AM
Re: 416 ruger popping primers	MarinePMI	24/02/11 07:59 AM
Re: 416 ruger popping primers	bigjedd	05/02/11 08:52 AM
Re: 416 ruger popping primers	Altamaha	06/02/11 01:45 PM
Re: 416 ruger popping primers	tophet1	25/01/11 06:20 AM
Re: 416 ruger popping primers	500Nitro	25/01/11 06:28 AM
Re: 416 ruger popping primers	450_Ackley	25/01/11 06:42 AM
Re: 416 ruger popping primers	tophet1	25/01/11 07:14 AM
Re: 416 ruger popping primers	DoubleD	26/01/11 01:57 AM
Re: 416 ruger popping primers	450_Ackley	26/01/11 06:36 AM
Re: 416 ruger popping primers	FATBOY404	26/01/11 07:26 AM
Re: 416 ruger popping primers	bigjedd	26/01/11 07:44 AM
Re: 416 ruger popping primers	bigjedd	27/01/11 11:42 PM
Re: 416 ruger popping primers	450_Ackley	28/01/11 06:03 AM
Re: 416 ruger popping primers	Ben	28/01/11 07:04 AM
Re: 416 ruger popping primers	bigjedd	25/01/11 07:08 AM
Re: 416 ruger popping primers	450_Ackley	25/01/11 06:10 AM
Re: 416 ruger popping primers	Con	29/01/11 03:44 AM
Re: 416 ruger popping primers	bigjedd	29/01/11 10:28 AM
Re: 416 ruger popping primers	Con	29/01/11 09:18 PM
Re: 416 ruger popping primers	450_Ackley	30/01/11 06:53 AM
Re: 416 ruger popping primers	Con	30/01/11 08:30 AM
Re: 416 ruger popping primers	450_Ackley	30/01/11 09:42 AM

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