Home Forums Hunting & Shooting Hunting Rifles Do you call BS or is this likely?

If you read the thread you would have noticed that I have set my max pressure at 43k CUP instead of SAMMI 50k. I have no fears of blowing the gun up

More of the issue is working hardening of the lug, it shearing off, with the bolt coming back into your face. I shot one in 30/30 growing up, and the rifle was plenty accurate.

Be safe Jevyod, be safe.

I shoot a 340 in 222. It's been a great groundhog gun. After playing with the barrel band tension it shoots 3/4 inch groups with factory Fiocchi 50 grain vmax. I have no fear of being injured using a 340. I use the b square mount scope mount. It's not pretty, but it shoots.

Almost certainly neither did Mauser before he designed his bolt actions. .

Have you seen examples of fatigue failure on these actions? Documented cases? Where have the cracks appeared? How many load cycles? Do you have any good pics of the fracture surfaces? Have you done any crack testing (MPI, dye penetrant) on these actions?



Again, any actual examples? Work hardening required repeated plastic deformation - a fair bit of it too, to be significant, so how much plastic deformation had there been of the lug before failure? What of the root of the bolt handle? Got any pics?

sell it ,like has been said it might bring a a decent price ? and just buy a new normal cartridge ? its a thought ?

Here is a picture of the rifle in question. I kinda dig it! Sorry to those who think I ruined a fine rifle. I am 34, not 84

Other side

That's funny.

Yup I suppose my choice of wording left some to be desired!! I should have said some will fuss that I took an ugly worthless rifle and made it even more worthless and ugly!!

Throw it in a creek and take photos.then I couldn’t tell if it’s big schtick’s or your photos.

Cool paint job.

I enjoy it when certain folks get all riled up. That's what quality entertainment is all about. Rusty

It looks pretty good and you sound like you know what you're doing with it. Just enjoy it and ignore the negativity here.

Some years ago, a crochety old bird hunter & writer (George Bird Evans) bought a high dollar Purdey SxS. Decided that it did not fit him just right, so took a file to it, until it did. He did a nice job, but lots of traditionalist really cried the blues.
When it belongs to you, you are free to do whatever you wish with it.

Hey keith, maybe you missed this. I am genuinely curious as to the basis of these claims. As a metallurgist I used to do quite a lot of failure investigation, and to be perfectly frank I have my doubts about your claims, but before dismissing them as BS I'd be happy to see the evidence, if you have any.

Have you found Mr. Denton Bramwell's equation for calculating CUP >> PSI ?

If you "goggle" (grin) CUP/PSI you'll find his treatise and EQUATION. He has talked about it here and I have the info but I also found it quite easily on the 'net'.

Good Luck

Prejudice runs deep as do personal opinions. On this rifle, I have NO opinion. I like the looks of what you did with it.

Jerry

I really am fascinated by the cartridge but I've passed on a couple Savage 340V's now. Still waiting for a model 70 that isn't out of my price range.

In the example I mentioned, I cannot say whether or not there was any work hardening involved but the lug definitely failed. It did not fail on the first shot so metal fatigue was obviously in play. GD

That was my thought too. Kinda of like calling a Yugo a fine motor car.

While it distresses me a little when I see a fine firearm irrevocably modified in such a way that its value is diminished, I understand that whoever owns a firearm has the right to do with it whatever he/she wishes to do.

Work hardening is unlikely, to say the least, as you'd have noticeable plastic deformation before failure in order to produce work-hardening - enough plastic deformation that the rifle would already be unserviceable.

As well, just because it didn't fail the first time doesn't mean it was fatigue. There have been many examples of rifles which have failed after some period of service - sometimes years of service - because something has changed or gone wrong, such as an overload or failed case, but which failure has nothing to do with fatigue. I suspect that in the case you cited it was about rechambering to .307 and loading hot, pushing the pressures up well past what the rifle was designed for, rather than fatigue. It is also possible that there was more than one contributing factor.

The appearance of the fracture surface is the key. With fatigue you'll see an area where the fatigue crack has grown progressively over a number of load cycles, before the remaining area is no longer sufficient to support the applied load and the crack proceeds to failure. It is quite distinctive.

You can also pick up incipient fatigue failure by crack testing, before the piece has actually let go. due to the fact that the fatigue crack progresses gradually under the influence of multiple load cycles - and usually a lot of them, which is why it tends not to be a factor in sporting rifles. .

You can also see a clear difference between that and say, brittle failure, or the effect of a defect, or an otherwise sound part which has been overstressed, eg by overloading.

That is why good pics of the failed piece, and especially the fracture surfaces, would be so useful.

Having said that, I'd also say that one swallow does not a summer make. These rifles were built to a price, but they were made for nearly 40 years. While I might not choose one for myself it seems to me that if the bloke who owns it is happy with it, and it shoots well enough to do the job he has for it, then that is really about all that matters. You example is a good one as to why you might not want to try pushing things past the design envelope, though it would be interesting to know a bit more about what might have caused the failure. The bloke who opened this question seems to be pretty clear on not being overly ambitious with loads though.

I say good luck to him, and hope he knocks plenty of critters off with his rifle.