Can Noveske .300 FB barrels use 5.56 brass?

[Garrett]

Like the subject says, can you use brass made from .223 / 5.56 in the Noveske .300 Fireball barrels? Or do you have to use .221 FB or neck-turn the 5.56 brass?

I haven't had a chance to put many rounds through my Noveske barrel, but last time out everything seemed to run just fine. The only problems I had appeared to be magazine-related.

Today, I went shooting again. I had several instances where the round wouldn't chamber completely, I had more instances where the next round would not feed ("click" on an empty chamber) and the bolt wouldn't lock back after the last round.

I realized on the way home that last time, I had separated my brass by .221 Fireball and 5.56, using one for the .300 Whisper Contender, and the other for the AR15/300. Today I was using all new-made brass from 5.56. So I'm thinking the neck is going to be too tight for the 5.56 brass, and I'm stuck using the (more expensive) .221 brass.

Anyone else experience this?

I like that my .300 Whisper Contender barrel from SSK can shoot either type of brass with no issues.