I had some time to play over thanksgiving break, so I broke out my H&R ultra slug 20 guage to prepare for bambi season. I've always shot the hornady 250 grain sst because that's what I've heard was good for this gun, and they are always available at the local big box store.
Range was 100 yards, temperature 45 degrees, sunny, and a very slight breeze from left to right. Shooting was from a supported shooting bag filled with corn. The corn is solid, conforms easily to the contours of the rifle, and isn't as heavy as sand when transporting it. Three shot groups were fine enough, the $3 per shell cost of ammo more than justified the lack of five shot groups.
Two hornady groups are shown marked in yellow, one circled and one with crosses. As you can see, they keep a good pattern, but the best was 4 7/8. That has been good enough for several deer, the longest shot was around 80 yards.
Next was the Winchester 260 grain partition gold, marked in black. Two were fairly close, and I'm pretty sure I pulled the high third shot, but I didn't think I pulled it that bad. The load looks promising, and will be tested more in the future.
Last was the Remington 260 grain premiere accutip. I've heard the load isn't that accurate, and the goofy green wiffle ball tip is all hype. Whatever, its time I quit listening to what others say about what is a good load. This group at 1 3/16 is enough to convince me.