Hi!

I must say i envy you, to order a london best in 577NE is a dream come thru. I would make sure that i wouldnt be dissapointed.
Is it a full nitro gun? with 750gr loads? Not being an expert but thats beond my limits thats for sure, the gun being a about a kilo heavyer then a scoped 458 bolt it would give a unpleasent wake up.
The advice to borrow ones "mountain" 505 or 458lot seems like a good ide, if 10 rounds thru it doesent bother you, go for it. And it would be fun lenting it someone that thinks doubles are without recoil.