I just purchased a box of Federal 1 oz 6's not too long ago. If you want a really light load look for 1oz of shot with less than 3 dram. now they are putting speed on the shells and anything 1200 Fps or less is going to be a low recoil load. The same with any of the 1 1/8 oz loads with less than 3 dram ( 1200 fps) are going to be a smooth shot shell.
The closer we get to Dove opener that more shells will be available in the 1oz selection and Wall Mart will have a larger selection.
Looking at the Remington catalog there are 1 0z promotional game loads available in 8, 7.5, and 6's. The speed is 1290 and they are a little over 3 dram but will work.