According to the Hornady manual, The .338 Lapua will do 3250fps with 200g, 3000fps with 225g, and 2800fps with 250g bullets. Basically the same as the RUM, but with a shorter barrel and faster twist rate. The Lapua's test rifle was a 24.5" 1-9 twist Sako, the RUM was from a model 700 with a slower 1-10 twist, 26" barrel.