I have my dad's 760 given to him a few days after I was born in October 1952, the first year they were marketed. I have Dad's diary recording when he received it. He gave it to me I think 1997. It didn't shoot very accurately ... until I discovered the barrel was loose! The early model 760s had sling swivel through the end cap of the slide tube (which is NOT telescoping!) ... which anchors the barrel to receiver. I suspect sling swivel movement loosened the slide tube = loosening the barrel = massively inaccurate. After tightening the tube, target groups improved significantly.
I suspect one reason these rifles sometimes suffer from inaccuracy is they lack free floating barrel. But when the 760 was made free floating barrels for consistent harmonics was virtually unknown technology (or unappreciated) The good news is it certainly appears to me that a few minutes with a Dremel tool could make my gun's barrel free floating. The bridge that "connects" the barrel with the end of the slide tube really doesn't connect anything. The slide tube and its base are very substantial construction and essentially free floating. I would use a Dremel tool grinder to put some daylight between the barrel and disfunctional tube bridge. Might require a bit of trimming in the fore end track. I see mine is just touching one one side at the end. My gun now wears synthetic because Dad cut the wood stock off for my mom.
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This would NOT be my choice for a "jungle gun". I just spent a couple hours disassembling and reassembling mine for a through cleaning. Hands down that 760 is the most difficult gun of any sort that I've ever taken down and put back together (including my Browning A5 which requires certification in neurosurgery). And the 760 has COUNTLESS areas that can trap moisture and dirt. Also, properly cleaning the barrel (or any gun barrel) requires cleaning it from the breech. Cleaning from the muzzle just shoves all the crap into the chamber. The only way to clean a 760 from the chamber end (with cleaning rod anyway) requires completely disassembling the rifle. I prefer to use a shotgun brush in a drill for cleaning the chamber so I usually want the barrel removed.
This rifle goes to my daughter and her husband today (Christmas). It wears an old Weaver K4 sitting on a funky Bausch & Lomb detachable base. I've ordered an old Weaver base and new Warne QD rings. They can look for a new scope. The adjustments on this adjustable base have messed up the scope tube. Also scope sits way too high. I have to hunt for crosshairs. To find the irons with the scope off I have to peek under a crossbrace that locks the scope down.