I sort of agree that it might be best to try before buying 8lbs. Those guns aren't accurate enough in common form to really like one powder a lot more than another. Maybe a little bit. I would buy a pound first, but it might not matter.
When designing a load, I think your order of importance is something like:
1) bullet selection
2) case preparation
3) charge weight
4) powder burn rate or fit to caliber
5) exact powder brand/type
6) primer brand/ type
7) advance case prep flash hole/ neck turn
So, I'm thinking in an old military rifle, I would sweat the powder brand/name, unless I could only find something else and then, that might be close enough.
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