Hector, Doug, or other frecuent users of JSB Exact: I have to order 5,5 mm (.22) and 4,5 mm ( .177)Exact pellets and I don´t know which size would be the best choice. These pellets will be used in magnum guns:
5,5 mm for Diana 350, Diana 36 and Diana 46.
4,5 mm for Diana 45 T01 and Weirrauch 80.
I've been using JSB Exacts in most of my guns for long enough to find that in my barrels the only difference between 4.51/4.52 and 5.51/5.52 is that the larger sized pellets produce slightly lower velocities and a slightly lower point of impact. Any other differences between the two sizes of pellets from my experience are to miniscule to mention.
But, I think your best bet would be the 4.52/5.52 sized since the majority of JSB users have picked those sizes as there favorites. Personally, between the Exact's and Schak's I don't need any other brand or type of pellet in my ammo box, they are just that good! Mulby
Mulby is right. Ideally you shold get a sample tin of each and then decide, if you cannot do this, order the 4.52 and 5.52 versions, the only thing you can loose a little of is MV.