The 129 SP not SST is a great gold standard, especially in short actioned rounds.
Penetration, expansion, and retention tests show its neck and neck with the 125 Partition. Very accurate. Deadly. Dual diameter can add less friction for a nominal increase in MV. Let's say up to 100fps for weight.
Personally I load 130 Accubonds in my 47 Lapua but the following are my next choices.
130 Berger
120 BT
100/120 TTSX
The first two might edge out a 129 in accuracy. The mono is unleaded.
In factory ammo, the 129 SP or the 140 Amax would be my choice.
