For ATA shoots, I like the Federal F209A in a Gold Medal hull, Federal 12S3 wad and 19.3 of Green Dot with 1 1/8 oz of 8's. This load shoots soft, hits hard and always works on even the coldest day.
For turkey matches, I like the Remington 209P in a STS hull, 25 grains of Herco, the Remington SP12 wad and 1 1/4 oz of 7's.
I prefer the same manufacturers primer in the manufacturers hull.
I shot 10,000 Cheddites in Federal Top Gun hulls, 12SO wads, 17.5 of E3 and 1 oz of 8's and this load worked great. I reloaded the hulls 2 or 3 times. However, I had trouble with the steel hulls in my 870 so I do not use it anymore.
Ed Ward