The free issue of Hodgdon Basic Reloading Manual 2005 has some great loads for both of the rounds you ask about. The same info also comes in a magazine that Hodgdon has published for about $8.00. Both are usually available at your local reloading supplies supplier.
The nice thing about these is they show the pressures of the various loads. Typically, the slower the powder the lower the pressure and the higher the velocity. There are a few exceptions.
I myself like to fill a case as full as possible. Not less than 90% and keep the pressure level in a safe range. When you start loading to maximum. The pressure can spike to very dangerous levels. I've never understood why anyone wants to make a small or mid size cartridge perform like it's bigger brother. If you need something that has bigger performance. Get a bigger gun.
I've found that H1000 in the 243 and Varget or BL-C(2) in the 358 are ideal. The pressure stays under dangerous levels and the velocity is within the maximum of the cartridge. Then again, I like those Hodgdon powders.
When it come to turkey calls some of us have only one or two. Then there are the ones that have and can't go in the turkey woods without at least a dozen or so. Remember that old calls still work. Just take a little time and freshen up your old style calling tactics.There are most likely more than a hundred types of turkey calls out there on the market. Just waiting for you to pull out the green and spend it on them. From Hunter's Specialties, Lynch, and even the famous Drury brothers calls...