Ive used a 7mm Mag for over 30 years, shot a lot of tahr. The one load that has always been consistent is 140gn SGK over 70gns of either 4831 or 2213SC. Now apparently this is a hot load, but not in my rifle. Checked it last weekend, 5 shots in the magic 1", 3140fps over the chrony. Am now playing with the 154SST just for shits and giggles, and it performs well. But its always the 140SGK's I take when I go hunting.
And theres no need to shoot tahr way out at beyond 400, there are plenty of animals in good terrain that are closer. The average distance for all the tahr I've shot or been in on, would be about the 150-180 mark. Remember after you shoot it you still gotta retrieve it so may as well close the gap before you pull the trigger.
Good luck, have fun, they are one helluva trophy to chase.
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