Herco powder and 1 1/4 oz of #6. Others use Longshot, Blue Dot, Pro Reach and 800 X with good success. There are lots of good recipes.
I have been known to shoot the same load with #7 shot also....I pretty much shoot #7 shot for my shell in all the game shoots.....Using a 1-1/8 oz load of lead #7 shot is a very good long range target load. It has more energy than lead #7-1/2 shot and way more pellets than a 1-1/4 oz load of lead #6 shot or 1-1/2 oz load of lead #4 shot.
1-1/8 oz of lead #7 shot has about 336 pellets.
1-1/4 oz of lead #6 shot has about 281 pellets.
1-1/2 oz of lead #4 shot has about 204 pellets.
If you read about what he broke that record shot with , it was his favorite crow load.....1 1/2 of 5s