EDgun .25 R3M Std and JSB Heavies?

Not personally but I have seen trials of them done in the Matador. The smaller Mk 2 heavies work best as the Mk 1s are harder to feed and Eddies tend to have tight chokes. Ed has selected a faster than std twist rate barrel for his matadors to excel at long range shooting so if you want to get the most accuracy from the new heavy pellets you should raise your reg pressure a little to get them to 900- 1050fps. My testing so far shows they love fast twist barrels and high velocity.