Rafter,
It seems a lot have people are unaware that IMR 3031 was developed for .30-'06 class cartridges, and it has been doing fine for 76 years.
If it ain't broke, don't fix it!
My concern would be why a rifle would shoot 1" with only one load and 5" with a similar load. Sounds like a bedding issue (hopefully), or a barrel problem (hope not).
Good shooting.
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