Seems like a good price to me.

I'd shoot them. .308 Win and .30-06 Spfld cab use the exact same bullets. What weight any particular rifle prefers is the determinant.

For powder, it depends on what powder and how many grains you intend to use per round.

Example - 45.0 grains of IMR 4895 is a mid-range load per Hodgdon.

That equates to 155.56 loads per pound (assuming no spillage, and exact volume every shell).

25.7 pounds, so, you'd need to buy 26.

Pick a different powder, a different quantity per shell, and do the math.

7000/(grains per load) = loads per pound

4000/(loads per pound) = amount of powder needed

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Just out of curiosity, do you already have that much brass, or will you be reloading as you shoot what you already have?