RE: .270 or 30-06?
I think you may have missed my point, you can use ANY cartridge and caliber you like. Just download until the recoil fits you.
You can load 30-06 to shoot like .22mags and squirrel hunt with it.
You can use a 338 win mag and down load until the recoil is suitable and still have plenty of knock down power.
As you develope you can change the loads to fit your size.
Any good hand loader will have the books to correctly load what you require, and can load the shells for you.
Hope this helps.
Larry