Dear Guys,
I am very surprised to see that nobody is talking about the extreme danger of these rifles. The FR-8s are accidents (bad ones) waiting to happen.
The facts are:
1. The actions that are used in these Spanish Made rifles were originally made to handle the pressures of the 8mm mauser miltary round. These are low pressure rounds compared to modern ammo. Maybe someone could look this up, but it is probably just in the high 40,000 psi range or the low 50,000 psi range. That pressure rating is what the action was designed to handle
2. The 7.62 CETME round is NOT the same as the 7.62 Nato round and it is NOT the same as the .308 Winchester. They are all identical as far as external size and shape (so they will all chamber in the same rifles) but they are very different rounds, that operate at very very different pressures.
3. The 7.62 CETME round was designed as a machine-gun round after World War II, in the transition days when people were trying to come up with shorter cartridges for automatic weapons. The Spanish Government adopted the CETME round in some machine guns.
4. The 7.62 CETME round operates at about the same pressure as the 8mm mauser round, or perhaps maybe a little higher. The Spanish Government, wanting to quickly convert some rifles to the new round, took their old Mauser Actions, removed the 8mm mauser barrels, and added barrels for the 7.62 CETMA round. (Notice that the barrels are stamped "7.62" They are not stamped "7.62 Nato.")
5. A short time later, the 7.62 Nato round was adopted by Nato. These will fit in the FR-8. But guess what, they generate significantly higher pressure than the 8mm mauser or the 7.62 CETMA. They generate around 54,000 to 55,000 psi of pressure in the action. So now, by firing the 7.62 Nato round in the rifle, you are firing a round that generates significantly higher pressure than these cheap Spanish made actions were designed to handle for the 8mm mauser.
6. It gets worse. Contrary to popular belief. The 7.62 Nato round is NOT the same cartridge as the .308 Winchester. True, they have the exact external shape and size, and will both fit in the same chambers. BUT, the Nato round has a relatively thick brass cartridge, so that it can be fired in machine guns without tearing apart. In contrast to this, Winchester specifically developed the .308 Winchester to be a hunting round, pushing as much powder and pressure as they could. In order to do this, they designed the .308 Winchester to have a thinner brass shell, so that it can hold more powder and achieve higher pressure than the 7.62 Nato.
7. The result? The .308 Winchester standard SAAMI pressure is about 65,000 psi, as compared to the 7.62 Nato standard pressure of about 55,000 psi. Think about that for a second!
7. End result, the FR-8s used old (not new) mauser actions that were specifically designed to handle the 8mm mauser cartridge and its mild pressure in the low 50,000 psi range. When you fire a .308 Winchester round in these rifles, you are firing a round that produces 65,000 psi, or 30% more pressure than the action was designed to handle. In reality, every time you fire a .308 Wiinchester in this rifle, you are firiing what amounts to a Proof Round.
8. Mechanical result? Get on the gun boards and research the FR-8. There are lots and lots of reports of the FR-8s developing excessive headspace after firing only a box or two of .308 Winchester rounds in them. (Gee, what a surprise.) And I saw at least two reports of the actions blowing. (Gee, what a surprise.)
9. The fact that some importers advertise these as being for "the potent .308 Winchester" is criminal. They weren't even designed for the 7.62 Nato. (Again, check the stamping on the barrel. You won't see Nato anywhere.)
10. They may look like really strong rifles, but they are not. I would never fire anything more powerful than the 7.62 Nato military round in them, and even then, I would be watching for high pressure signs.
11. As for shooting the .308 Winchesters, remember, you are putting an iron chamber against your face, and under your right eye, in which a 65,000 psi explosion is occurring, under circumstances in which the chamber is more than 60 years old, and was designed to handle 50,000 psi of pressure, and was built before or during WWII by some foundary in Spain!!!!!
Sorry for the bad news! This is all well known to Mauser fans.
Big Paulie