i would not tell anyone to buy accelerators. they are very very inaccurate. at 50 yards it was doing good buy putting 5 shots into a pie plate.

the 223 over the 22-250. i would go with the 223 if i was a non hand loader. their are just more bullets to choose from and you won't notice much different shooting the two until you get out past 350 yards. and with factory ammo i would say your best off keeping your shots inside of 300 yards weither it is a 22-250 or 223. but if you handload that is where the 22-250 shines. you can push it really fast or you can use a mild load and pretty much be shooting with the same balisitics as the 223

plus i would take a rem. 700 that shoots over a vanguard any day, even if i new the vanguard also shot well. the 700's are just a lot better quality gun IMO