I used the E3650 in Gamo, Quest, Summit, etc. with small Apex. Gives a nice smoother cycle than stock if not somewhat less power due to coil count (?)
I've used the Tarantula in same series of rifles. More power. However, IIRC without going through my notebook, The Tarantula has slightly bigger ID. Fits sloppy on the Delrin guides from Crosman. Somewhere along the line Crosman switched to steel rear guides (?) which fit the Tarantula better. Or possibly they started with steel and went to Delrin. Anybody else experience that? Also, I know the Tarantula has biggger wire and again IIRC bigger OD. When I've used the Tarantula I've had to fit the cocking shoe because it will drag.
My personal recommendation is E3650. Who needs more power? E3650 expect a mid 12-13 FPE result or about 850 fps with 7.9gr. I feel this is the perfect power range for these rifles. Nice and smooth and fits the platform well. If you want more power I'd recommend going to a TF89, B28 or B21/30 (I like the Chinese rifles!). I feel you need a bit heavier rifle to balance the power and the Gamos are too light. But my guess is if you want more power you'd be best off going with .22. If just plinking .17 in this range is hard to beat. Flatter shooting, cheaper pellets and the smaller hole doesn't obliterate your target as fast. Yes, I'm primarily a paper puncher!
Andy Wong aka larspawn
