My 1990-vintage DuPont Handloaders Guide shows a max load for the .30-30 and the 150 CoreLokt as 37.5 grains IMR4064 (compressed) at 37,800 CUP and 2350 fps. The current Hodgdon's on-line .30-30 data shows the 150 Sierra FN over 33.3 grains of IMR4064 as maximum with 36,200 CUP and 2236 fps. It is difficult to believe that the difference of 4.2 grains is due to the bullet brand. Just another example to confirm that you should use current data.
The Handi can take far more pressure than an M94 so you can 'get by' with higher pressure loads. Pimer appearance is a BS method of determining pressures, particularly for cartridges with maximum pressures under 40,000 CUP. You have no idea what your pressures are, or if they are well above SAAMI maximum.
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