"I'll leave it up to you all as far as the .30-30. If you were bucks down and wanted to load both these with a common powder, what would you do?"
If I were really short on funds, the most expensive part of this equation is the bullet, so I would most definitely use the same bullet in the 30-30 and the 30-06, probably the 170grFN from Hornady. Very cost effective and it works great in the 30-30 and it will work in the 30-06, but will expand faster than those designed for the 30-06; you can also translate that, " will expand like a 30-30 at far greater distances". The main problem would be if you were at very close range, it would be too fragile to hold together and at very long ranges, it would drop considerably faster than a spire point, though I don't think I would see the difference, especially if I were trying to shoot on a tight budget. As to powder, all the suggestions have been good ones, so it might come down to price. I just bought some 748 @ $19/lb in October. I know it can be in the $30/lb range. Sometimes you can find unopened cans from classifieds and trade papers in the $15/lb range. At an Estate Sale, the deceased was a handloader, I found five unopened cans including Varget, H335, BallC2, and IMR4064. 5 pounds for $65; that's $13/lb - if the cans are opened, leave them, you just can't be sure of the contents.
Really on a budget? Get some cast bullets. In the last 10 years, only one animal went into my freezer via a jacketed bullet. All the rest have been cast bullets. If you don't have any friends who cast, and you don't cast because you are just starting in this fascinating hobby, send out a may-day. Some of us might spot you a few of our favorites to get you going, but only if you are serious about using cast bullets. They are a lot of work and a labor of love, and we wouldn't want to think they were just sittin on the shelf or relegated to shooting pop cans. The deer, antelope and elk I have shot didn't know they weren't getting shot with Noslers!! 183gr cast bullets at velocities approaching 2400fps and all shots between 100 and 200 yards. Only the cow elk needed a 2nd shot, though she wasn't going anywhere. These game animals don't need premium bullets for quick kills. They do require good shot placement, with a good bullet. Cast bullets were feeding families long before jacketed bullets were even thought of.
When I'm short on funds, I'm happy that I haven't relied on 500yd shots with 180gr superpremium jacketed bullets at over 3000fps from some superwhizbang magnum. They are expensive to shoot. Though I have been successful with shots aproaching 400yards with my not so premium jacketed loads cruising along at 2700fps, most of my success has come well under 150yards, with cast bullets running from 2000-2370fps. Leaves me a bit more for gas money! LOL
Regards,
Sweetwater