I contacted Harvester to purchase a bag of 50 crush rib sabots but they wanted as much in shipping as the sabots. I told John that I wanted to try them out (hadn't yet) and he offered a sample pack.
If they give me the nudge in accuracy I'm hoping for then I'll give them my business and pay the shipping costs for a full bag.
The LGSs here in Colorado don't carry sabots since they're not legal for hunting in this state.
