I located an old ad for the Schultz and Larsen M60 from 1959. Hard to read but it says that the original Norma 7x61 S&H load uses 60.5 grains of Norma Special #104 powder to push a 160 grain PSPBT bullet at 3100 fps. These published velocity claims were later found to be overly optimistic. This led to the later release of the 7x61 Super load mentioned above that uses 150gr/154 gr bullets and an updated interior case profile to increase powder capacity. Based on this, it seems that Bandukwallah can load up to 160 grain bullets for his M60 rifle and the 1:12 twist will stabilize them adequately.

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