Greetings again,
I had a look on Loaddata,com and in the back issues of Handloader and found plenty of data but none whatsoever for AR2207/H4198. There was quite a bit for IMR3031 though.
GPM.
PS. Many of the powders listed required compression at their top loads including IMR3031. Certainly AR2207 will not be optimum and will require lower velocity to keep pressure down but Speer used to list reduced loads of IMR4198 for many of their cartridges including the .350 Rem Mag so for a soft load approximating the original 1905 loads it should be a good fit. The problem is the lack of load data. The late and great Ken Waters often listed soft reduced loads in his Pet Loads series but regrettably not for the 9.3 x 62.
GPM.
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