actually, thats why I went 6.5.... I had just ordered my AR10 lower 2 hours before the shooting happened. ended up selling it because I couldnt get the parts I needed but I had spare parts for an AR15, so I ordered the barrel and bolt for the 6.5 during the height of the panic in early 2013 and was able to find 6.5 bullets easily.
what 300 win mag do you have?
