This is a discussion on TulAmmo or Silver Bear: Should I even try? within the Ammunition forums, part of the M14 M1A Forum category; Originally Posted by Mocos
well...just out of curiosity, when did steel cased rifle ammo appear.... certainly after brass cased ammo. That would suggest that the ...
well...just out of curiosity, when did steel cased rifle ammo appear.... certainly after brass cased ammo. That would suggest that the designers of the steel cased ammo would have taken into account the metal properties needed to duplicate brass. Brass cases were sufficiently strong enough then so I am thinking that there wasn't a requirement to produce anything stronger than brass. Wolf attempted polymer cases a few years back without any success. I don't recall any attempts at aluminun rifle ammo.
I think that is a good question, and I hope somebody provides a serious and correct response!
I've shot a lot of Silver Bear 308 out of my M1A. Not a problem in over 500 rounds. I clean the chamber after every range session. Accuracy isn't bad and the powder charge feels consistent between shots. FWIW, max pressure on the Silver Bear is about 42k which is significantly less than 7.62 Nato and 308 Win which is around 52k and 62k respectively.
In my opinion, Silver Bear and Brown Bear is fine for plinking. Both come out of the Barnaul plant in Russia and is much more consistent than whatever Wolf imports or even POF.
With regards to concerns about steel-cased ammo... don't forget that your weapon is made from tool steel. The steel casings used by Russian manufacturers is much softer. I've used steel-cased ammo in just about every firearm I own for the last 18 or so years without problem. Whether or not you believe that is up to you. Personally, I'd rather shoot more and worry less. If I ever did break or wear a component out, I'd replace it and keep going. I've saved a lot of money plus honed my skills shooting with cheaper ammo and saving the good brass for hunting or competition.
not sure that is entirely true...I read that because the steel cases do not expand as fast as brass upon firing and seal the bore, that gasses and carbon blow back into the neck and chamber and is the main source of 'gunking" up the chamber to the point where feeding and extraction becomes a problem..some guns exhibit it more than others and some don't at all. As far as the coating accumulating on the chamber walls...possibly....I would think that the chamber temperatures get so hot that any coating would be vaporized...so I think the carbon build up is more plausible...
Steel doesn't expand as much as brass. The crap in your chamber isn't lacquer. Its powder residue that eventually cakes up. Switching over to brass from steel without cleaning the chamber can result in the brass sticking to the fouled chamber walls. Just clean your chamber before switching over to brass and you're good to go.
I've taken a propane torch to an empty lacquer case once and the lacquer didn't melt off.
If it doesn't expand as much, it doesn't seal as well.
No coincidence; merely something one has to be aware of when alternating between steel-cased and brass cartridges without properly cleaning the bore. People will often mistakenly blame the lacquer for stuck brass cases when the lacquer really has nothing to do with it.
What does have to do with it is the elasticity of the case, it's ability to expand to seal the chamber and contract to facilitate extraction. The difference between the unfired case, the case under pressure, the fired case and the chamber size is the margin you have to work with for reliable operation.
Einstein said "Everything should be a simple as possible, but not simpler."
stoky's corollary says everything shoud be as cheap as possible but not cheaper.
It's your stick, shoot what you want.
With regards to low pressure resulting in a primer that protrudes from the case...It can and does indeed. But it is not the primer backing out! Rather it is the casing not backing UP.
The expansion cycle of a casing is the culprit. When the powder ignites and pressure builds up in a case, it expands outward first...radially until it hits its chamber walls.
Then, as there is no other way to go, it expands front to back until it reaches the bolt face. The reason it is not always growing forward as well as backward so much is because the impact of the firing pin has knocked the cartridge as far forward as it can travel while still being held by the extractor. Granted that is only a couple thou, but "GO" specs for chambers are only a couple thou. and that primer only protrudes a couple thou, right?
Anyway, what happens with low chamber pressure is that the case cannot overcome the friction of pressing against the chamber walls radially to come back very far at all, however the primer does protrude, and the case just ain't coming back to reseat itself onto it against the bolt face.
Thats also why high pressure crushes the primer flat!
And why a backed out primer can be an indicator of excess headspace as well.
With steel cases being less ...expandy...than brass to begin with, or elastic or what have you, I figure thats why we see primers backed out a bit in the 14. And they tend to be loaded a little milder than brass ammo.
First time I ever saw this condition manifest was reloading for a 30-30 Winchester. The starting loads in the manual are very low pressure. 26,000 PSI probably not unheard of. 30-30 maxes out at 36,000. You can start a load seeing primer poking out, and as you work up the load, its magically gone!
Gave one of my teachers fits arguing it was a sign of low pressure as well as high pressure afterwards, in school ;)