No can,t be larger then 270 I,ve priced out ammo at TSC ,Walmart ,Canadian Tire I,am in Ontario Canada if your wondering. Tsc seems to be the cheapest and the other two stores sell the same brand winchester I wrote it all down don,t have it in front of me right now. But what I can remeber is Tsc is about $4.95 cheaper .I,ll post the prices if any one is intrested and that goe,s for all ammo.