randello88
Well-Known Member
The dual solution makes sense but it would be absolutely necessary to account for the different zero of the lomg range ammo before shooting it and also this way sometimes changing from one cartridge to the other could cause a poi shift in comparison to the zero for that second ammo because of the different fouling in the barrel caused by the previous load. I have seen it.You cannot go on and choose a bullet based on weight, if you want long range terminal performance. That requires reasonable terminal velocity, i.e. good combination of muzzle velocity and BC (velocity retention).
168gr ABLR has better BC than 180gr regular AB. I've shot 200gr AB in 308 Tikka (same 1-11" twist) but only on range (got them at very good price). They stabilize OK, round holes and good accuracy at 150m, but I wouldn't use them on game where you want rather over- than understabilization. 190gr ABLR is .005" shorter and WSM has more velocity so you might get away with it.
I'd have suggested the dual load solution ("short range" in chamber and "long range" in pocket) but it requires either luck / very thorough load development (get away with single zero for both loads) or very very solid routine (remembering to change zero and return to original zero after the shot). If you go that route just duplicate your current 308 load for short range (assuming you're happy with it) and develop the long range load using suitable bullet and as much velocity you can get.
Some data points from my experience (these are personal opinions on what to use, I don't have any cull targets etc.)
- 165gr 30cal AB at 308Win velocity (MV 840m/s) will tear roe too badly sub 100m
- 900m/s terminal velocity is too much for fallow sized quarry, even if we drop down to 6.5mm
- 1000m/s or near terminal velocity is too much for fallow size, even dropping way down in caliber/weight
I tend to reduce the things to think about to the minimum possible at the moment of the shot and focus on that so i will stick with a single load probably. But of course all this talking is secondary to field tests on rifle accuracy with certain loads


