animalpest wrote:Having never hunted Sambar, but hunted plenty of big stuff in the the thick, I would be opting for more horsepower than the 7.62x39. Sure, for near perfect shots, it will do the job. My .222 will do that too.
I am with most here in that a good, low powered scope that can be cranked up to about 9x is what you need, along with a minimum of .308W to get penetration.
The perfect shot invariably seems to present when you don't even have a rifle at all, most of the time you'll be taking the best shot you can get in the conditions at the time, and probably well short of perfect. The numbers I presented earlier "Hornady offer the 150gn Interlock soft-point bullet in .308" and .312" for the Euro-calibres. At 400m the 2800fps .308 is down to 1750fps, which is the speed the 2200fps 7.62x39mm makes at 185m. So if you consider the .308Win to be effective at 400m, you would have to consider the 7.62x39mm to be equally effective out to at least 185m as the result on the target with the same bullet is going to be virtually identical. If you only consider the .308 to be effective out to 300m (1980fps) then the 7.62x39mm must be effective to 85m (1980fps) at least." do indicate that if you only consider the .308Win 150gn to be effective to 150m max, then you would have to consider the 7.62x39mm 150gn to be entirely ineffective, even at the muzzle. Clearly a simplification but it makes the point I think. It comes down to using a well-designed bullet that you can effectively put where you want it at the distance you're shooting, and have it impact, and function, at the optimal terminal velocity - regardless of the cartridge you're using. Really, if it were possible to take all shots from two-metres at an unaware and stationary target the chambering would be largely irrelevant.
What I've found with scopes is that every time I've been out looking for deer it's been raining, and that sucks for optics, even red-dots. It's possible to protect the lens from water while you're not actually using the rifle (the most effective seems to be the all-enveloping neoprene sock style), but when you do have a target, and it might take a minute or so to line up a shot, you already have splashes on the glass. Partly why I've been focussed a great deal on practicing with open sights and apertures. I had several aperture sight rifles out a couple weeks ago in heavy rain and found even those easily get water splashed into the apertures ruining the sight picture. I'm thinking rain might be why the Russians so preferred to use the rubber eye-pieces on their optics-equipped rifles.