If you are looking at a shorty then maybe a Deadair Sandman K? No restrictions on that. Not sure who else offers a short can like that.
Or is this a can you have already and just checking?
There are some full-power loads for .300 Whisper that would be OK in an Ultra 5, etc, at that barrel length, based on our conservative pressure rating and derating factors for SBR's; however, there are quite a few that would exceed the uncorking pressure of a 14.5" .300 Win Mag SBR (not that anyone would do THAT), so, you really have to be careful.