I routinely shoot the 300grn Scenar with 90.0 Retumbo in Lapua brass, Fed 215M primers. Last weekend (temp was 55F) I was getting 2780 from a 24" Barrett MRAD.
91.0 of Retumbo under the same conditions was giving me 2820.
90.0 is the best accuracty with the 300grn Scenar in my...