I fancy buying one of the AGM clones but how can I downgrade it to 350ish for use at some of the <ahem> more conservative sites?
I'll then up it for use at sites where 400+ isn't verboten 
Either clip the existing spring, or pop in a lower powered one. It's quick, easy and cheap.
When I want your opinion - I'll tell you what it is!
Buy a weaker spring, or a complete bolt assembly with the spring, changing the spring repeatedly though will wear the threads out on the cylinder, as will repeatedly changing the bolt will wear out the spring guide stopper & the securing bolt threads in the action, best option would be to have 2 rifles, one low power & one higher power although with a low powered rifle you wil have reduced range & be easy prey for people with AEGs,
Steve.
