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Shooting & Reloading - Mausers, Big Bores and others >> Big Bore Rifles
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rgp
.333 member


Reged: 17/06/04
Posts: 373
Loc: TX & VIC
Gas venting and punctured primers...
      #26400 - 16/02/05 04:16 PM

I have never experienced it myself but when browsing another forum I saw a post on a punctured primer in a Winchester Model 70 and the shooter is pretty confident he would have lost an eye if he wasn't wearing a pair of glasses.

I am curious if anyone else has experienced this sort of nasty gas venting, and if so in what type of rifle. Since reading the post I'm a bit apprehensive of some of the rifles I own even though primer punctures are rare occurances in the past one hundred years.

I'd like to know if anyone who has experienced the gas vent in use has had the gas blow straight back or down or elsewhere, and which rifles they were shooting at the time.

Richard.

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Marrakai
.416 member


Reged: 09/01/03
Posts: 3652
Loc: Darwin, Top End of Australia
Re: Gas venting and punctured primers... [Re: rgp]
      #26408 - 16/02/05 09:09 PM

I once witnessed a blown primer in an FN SxS shotgun. The gun did not have bushed firing-pins, and the gas-escape, in the right barrel, blew a large chunk of stock-wood off the side of the head, millimetres in front of the shooter's right knuckle.

It was I who found the errant piece of walnut, after everyone-else had stopped looking, about 25 metres away in the grass! Had it happened in the left barrel, we need have looked no further than the shooter's face!

I know of a .400 double rifle to-which this happened also. The splinter has since been glued back on. I offered to buy this gun, knowing that a re-stock would be required, but the current owner will take it to the grave apparently!

While neither of these incidents resulted in serious injury, it was only by the grace of God!

--------------------
Marrakai
When the bull drops, the bullshit stops!
--------------------------------
www.marrakai-adventure.com.au

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GreenjoyTJ
.224 member


Reged: 04/05/03
Posts: 28
Loc: Pickering, Ontario, Canada
Re: Gas venting and punctured primers... [Re: rgp]
      #26720 - 24/02/05 01:28 AM

I had a cartridge case rupture in a Savage Model 99 chambered for 300 savage. A hole smaller than a pin head burned through the cartridge case about a quarter way up from the extractor grove. I felt a blast of gas on my face.
I was not injured at all but I was very supprised and will never forget the experience.

I have been reading a book entittled "Bolt Action Rifles" 3rd edition by Frank de Haas. In the chapter on Winchester Models 54 & 70 Mr. de Haas describes how the model 70 is a little deficient in the area gas management.
He wishs the model 70 had a gas shield like Mauser actions that have flanged bolt sleeves and wishes a vent hole added in the left side of the M70 receiver in addition to one in the right side of the receiver ring.

Mr. de Hass mentions that the lack of any gas shield on the bolt sleeve of M70 rifles can be fixed and that on page 73 in the April 1964 issue of "The American Rifleman" instructions are given on how to install a simple Mauser-type gas shield on the M70 bolt sleeve. "The outside of the bolt sleeve, just to the rear of its forward flared edge, is fitted with a shield made from a steel washer,silver soldered in place. The washer extends to the outside of the receiver to deflect outward any gases expelled rearward along the locking lug raceway.

Try contacting The American Rifeman magazine (NRA publication?) they may sell reprints of the article. A good gunsmith is probably allready aware of gas handling improvements that could be retro fitted to the M70.

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DoubleD
.400 member


Reged: 23/11/03
Posts: 2451
Loc: Retired in Oklahoma
Re: Gas venting and punctured primers... [Re: rgp]
      #26728 - 24/02/05 04:28 AM

Ah yes the very desirable Pre 64 M70.

At Gunmsithing school there was a student with a glass eye and plastic nose tip. Ruptured a primer in a M-70.

Next time you shoot your pre 64 M-70, as you aim in look down at the rear of the action and in particular the bolt lug race ways. Those raceways are pointed right at your face. If you rupture a case head or primer the gas is going to be vented right down that raceway and right into you face. So how often is that you are going to rupture a primer or case head? That's one lottery I don't want to play.

If you have a M-70 have a new bolt shroud with gas flange fit. It just might save your eyes.

--------------------
DD, Ret.

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