Thread: 30-40 Krag in a 303 SMLE action - max pressures?

Correct me if I'm wrong, but am I safe to assume that I should be able to use load charts for 303 British (up to 45,000 CUP), rather than for 30-40 Krag (up to 40,000 CUP), in a rifle built on an SMLE III action with 303 brass necked down, in a 30 calibre barrel? Not that I am planning on hot loads, but I've realised that with a 1:10 twist barrel I've got a pretty wide range of projectiles available, and it potentially won't be far off what I can shoot in my 308. In fact even the 30-40 Krag charts on the Hodgdon reloading website show a max. of 43.5gr Varget with 150gr Nosler Partition, which is pretty close to what I load for the 308.

I'm using 46gr 2208 behind 125gr Sierra Pro-hunter in 308, which although is the max. charge in my old ADI loading guide, is 2 grains below the starting charge of 48gr on the Hodgdon website.

But then in the same old ADI guide, its says to reduce max loads by 2 grains for SMLE actions (against the P14 actions).

Anyone got any experiences/wisdom they care to share?