Hello mate,
What pellet can you group best in a fifty pence piece size target at 40-60 yards, I think that's your main objective, personally I wouldn't take a sixty yard shot at a rabbit with .177 ammo, I dont think there,s enough knock down power, also I wouldn't use a .177 pellet above 9 grns, there seems to be a lot of evidence about using heavy loads, some say it can shorten the life of the spring significantly, its only an opinion mate but I hope it helps, ATB,
Rob.
I group best with the h&n ftt, aa's are slightly better 60-70 yards but too many damaged ones in the tin they