Let me start by saying I know that it's too short, but a I have a 8 inch Bren 2 in 5.56 and I might as well have some ammunition on had that is effective 50 yards and in or at the very least 25 yards and in.

I already have other firearms with more suitable barrel lengths.

I have found some gel tests but they all seem to be old and some of the loadings are not available anymore.

Is there any more recent testing/loads I am missing?

Hornady Black 75gr InterLock are specifically designed for 10.5"-11.5" inch barrels.