Does it have to be a blot gun? M1's can be had in .308. Great shooters too.
I had an Ishpore "Jungle Rifle" in .308, and it was nothing but trouble. Fired single shot, which is basically what it was, it was accurate, but reliable function was non existent.
The mag that came with the gun was crap, and ill fitting, the replacement cost me $35, and helped a little. 90% of the time, it would leave the empty case sitting on the top of the mag well, or if it did eject, it would just fall off to the side. I replaced the ejector with no change in results. The extractor seemed to work fine.
It also had headspace issues, and was getting case head separations on the first reload. I understand bolt heads are available, but at that point, I was done with it.
I have a couple FR8's, and they are great rifles. Handy and accurate.
If you get one, resist the urge to turn down the bolt. Once you get used to it, you'll understand why. That straight bolt makes operating it a breeze. It also make carrying the gun at the balance comfortable and easy.
.308 works with the 8mm Mauser strippers fine. The best ones Ive found so far, are the "chromed" strippers. They work and feed the best. The "parked" strippers I have work, but not near as smoothly or easily.
If youre familiar with the HK "90"/G3 series of guns, and know their sights, the sights make sense. A lot of people dont understand what it is they have, or how they work. That big "notch", when used with the front "globe", is your CQB/100m sight. When you use the full notch and the globe as a whole, that is your CQB sight. Use the small "V" in the bottom of the notch, with the "post" in the globe, and you have your more precise sights for out to 100m. The following pic explains the rest of the elevation settings easier than I can type it........
Windage is accomplished with the front sight. Its got a very fine thread, and the post is eccentric.