Found some pressure data from that barrel.
150 GMX at 3370, 168 Amax at 3200 fps :)
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With the light Barnes bullets I would try IMR4895 first. (And use the data from IMR themselves.) With the barnes bullets you can load them up a little bit more than normal, but work up carefully in half grains, because with this faster powder the pressure signs come on suddenly.
Toby the correct spelling is "Blouser" :D:D:D