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300 H&H magnum Encore R22

A friend of mine is looking for suggested loads for his Encore using 180 grain bullets and R22 powder. I have looked through my books and come up with nothing.
Comments
300 H&H 180 RL22 71.0 3,023 Nosler 6th
They are NOT starting loads; consult manuals for starting powder-charge weights.
AND,
http://archives.gunsandammo.com/content/top-handloads-300-hh-magnum-rifle-cartridge
From the Alliant Powder Reloading Guide:
Centerfire Rifle
300 H & H Magnum
Speer 180 gr SP
Reloder 22
CCI 250
Winchester/ 3.5" OAL/ 26" barrel/ CCI 250/ Reloder 22/ 70 gr./ 2,996 fps.
Re-22 is a fine powder for large capacity cases when a double base powder is warranted. But there are several other powders which will allow for slightly improved performance over Re-22.
In no particular order:
Accurate 4350
Ramshot Hunter
Hodgdon Hybrid 100V
IMR-4350
Re-19
Best.