Will it take great force to cock the gun , i know sidelevers are nice and really easy but cocking 2 springs is alot of force?
What caliber will best utilize the potential power for your design, maybe 177 being light might keep you under 12 fpe? or go supersonic hehe
How much will the gun weigh, this seems to be a major concern on the some airgunners , not so much here because everyone here is a tinkerer -tuner like yourself ??
"i never was much for book learnin"