As said, 3006 150gr and x14 scope will be good. Chamois are a lot smaller than sambar so dont use a bullet thats too hard and deep penetrating. Even a tahr needs expansion and you wont always be shooting a big bull.
Test your trajectoty to 300m and bring over a calculated drop chart set for 5 degrees C and 1500m altitude with estimates for 45 deg angle and 10 m/s crosswind just in case.
Also the hills are biggrr than you have in Vic so check out the post here on getting fit stepping out with Philllipo.
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