Wow, those are some great groups! As soon as I sent him the payment for the Big Cat, I hopped on over to Maccari's site and placed an order for a lube kit, small Apex, and the e3650. I didn't really consider the Tarantula because I didn't want to jeopardize accuracy with a beefy spring. However, I would be really interested in finding out what your results are when you get around to it. Did you check out the Varmint Hunter on the yellow? It's only $90 with a GRTIII and I think it's still available.