For someone who was a 30 years a Government Inspector you don’t know from which Command Army fire arm designers are assigned to. ATEC’s chicken little bulletin was not written by a firearm designer and certainly not a mechanical engineer. There is no data and no reference to data. When a four star signs the thing then it will represent the Army’s Opinion . ATEC does not address firing their rifles in the rain, it will be interesting to find their opinion on that. If oil is bad so is water.
This is just another example of you Googling up something and you not having the ability to evaluate your sources.
This is from a Army Report on the Stress Analysis of Steel Cases: ARF Report No K70
This is from AMCP 706-252. Cases don’t take load.
As for a manual from Springfield Armory. This is just another customer service representative protecting the company from liability. SA also does not warranty their rifle arms with reloads. And for good reason.
SA did not design the M1a and I know from a book written by one of the SA designers that cartridge friction was not a consideration in the design of the Garand/M14 bolt.
I have no idea of where your bolt is hard to open came from. I think it is just example of you Googling up junk science. This is a technic of yours, as the real experts in this thread found.
http://www.thehighroad.org/showthread.php?t=601376&page=3 You really think you know more about revolvers than 1911Turner, OldFuff, or Triggerman770?
After reading your posts in that thread, the funny part is that you do.
Lubricated cases will give a better indication of true cartridge pressure, which is a possible reason the British used lubricated cases in their proof tests. There is parasitic friction between case and mechanism which will disguise overpressure conditions. Of course wet or oiled cases are not to be fired in a Lee Enfield as that is a very weak action.
If you are really worried about pressure, cut your loads.
I also trust Varmit Al's decades of structural analysis at a National Lab more than your ancient texts.
http://www.varmintal.com/a243z.htm A place you have been, have read, and discounted.
If you want to know what real design books say about breech loads these are real design books:
“
Brassey’s Essential Guide to Military Small Arms, Design Principles and Operating Methods.” Open to page 115 and there are the calculations for designing a bolt. No cartridge friction assumed.
“
Small Arms” by DF Allsop and MA Toomey. Pages 70 and 71, a very nice analysis of the unlubricated case and the lubricated case with a statement that modern designers have stopped using lubricated cases in favor of employing a fluted chamber. A fluted chamber provides gas lubrication to break the friction between case and chamber and is used in many weapon systems, the FAMAS, G3 weapons systems are examples.
One very good book is
Ballistics by Carlucci and Jacobson. They clearly state in their book that the cartridge is too weak to carry load. This is an extremely advanced book, written by real Army designers, and they do not work at ATEC.
Like I said, if oil is bad so is water. The British NRA are recommending not to fire the Lee Enfield in the rain, I have not seen similar warnings for M14’s and AR’s.
So, don’t fire your Lee Enfield in the rain.
