One of the reasons I switched to loose powder in my magnum rifles is if you push too hard on the pellets you crush them and that ain't no good. It also isn't good not making sure your bullet is seated all the way down. Loose allows me to make sure the bullet is seated if I am worried about it without hurting the powder charge.

I do not like anything hanging out beyond the muzzle. I feel it can mess up your shots by deflecting the pressure gasses escaping the barrel. I have only the experience of ported barrels to say that. I notice they port evenly around the barrel to keep the gasses flowing evenly.

Sounds like you are good to go. Take my advice with a grain of salt or two.