Odd question. How far from a Sporting goods store are you?
Close to 140 grain is the ideal for 6.5 supposedly, but I expect 129 would shoot fine.
Each rifle is different and even a rifle off the line right behind another one can be dramatically different.
If you get match ammo that almost assures as close as you can it will shoot at least decently in most guns, sometimes great. Rarely poor.
But no one can tell you for sure ahead of time, you have to buy and test ammo, plain and simple
If you can get the 136 (?) Lapua Scanner in factory that is probably the best chance.
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