Pellets
All of the mentioned pellets are made by JSB and for FT use there is little point in looking elsewhere. Pay no attention to quoted head sizes just test until you find some that go well in your gun and then buy as many tins as you can! If you can find a 40 yard plus indoor range you can use so much the better. Don't bother weighing or looking at them - shoot them and see how they go. The pellets I just used coming second in the world FT championships were FX branded JSB Exact, they looked awful and had poor weight control but were very accurate. If there is a measurable factor that relates to accuracy with Exacts I'd say it's length, measure the overall length of the pellets and favour batches shorter than 6.18 mm, you only need to measure one pellet as length consistency is fantastic within each batch.
Best Regards
Simon
I've got some slug guns.