Had a raider 10xs. Nice gun but no where near the league of the rifles already recommended. An S200 with the 10 shot conversion is a much safer bet in my opinion, but may not meet one of the buyers criteria, for instance, shot count....
not had much us with the webley raiders but heard good things about them said the webley cause they are well within his budget but would deffo go for a s200 if had the chance and agree s200 are in totaly different league but the webley raider would be a good place to start and been a multi shot for 350 is pretty good price and plenty left for pump and scope