41s are magnum equivalent. Their cups are thick to prevent slam fires (and maybe add a little bit of drop-safeness) in ARs, which have floating firing pins. I'd expect they are loaded in any factory Federal 5.56 ammo.
Do some googling on primers. There are places where you can find all the cup thicknesses, etc. for the various brands and specs.
Or just back down to starting loads and work up again with 41s or 7 1/2s.
1:9 should work well with 62 TTSX.
