300 Blackout Subsonic Rounds from NON-SUPRESSED Rifle. Will it work?

I knew that the rounds would fire, but I'm not so sure (as clearly evidenced by the video) that I knew they wouldn't cycle like they did. Nevertheless, I think soon I finally need to get a supressor. I just need to bite the bullet and do it.

I didn't try the gel because I want to test more handgun stuff. I think the rifles tests I want to do would benefit from longer gel so it doesn't just pass right through it.

Two questions:
1) Does anyone know how long the wait it with the e-file?
2) What buffer weight should I use when I do get it supressed?

More 300BO to come

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