Few weeks ago my dad found a custom order NEI mold on ebay. The mold was for a 235gn grooveless, round nose boat tail design. After some discussion, we decided to buy it. Finally got around to trying some today in my 300 blackout, which is a Ruger American bolt action, currently topped with a 6-24x50 Bushnell elite series. This was actually my first time attempting to work up a subsonic load for this rifle. I have had very good accuracy in this gun with lighter bullets, and even took my deer with it last year with a 193 yard head shot.
Anyway. After playing with primers and powders a bit I was able to get it to shoot about 1 MOA. When dad cast this batch up, he water quenched them after we powder coated them, and they came out almost 20 BHN, which I think is way too hard for suck low velocity. I'm hoping to make up another batch at about 12 BHN, which I think will be much better suited for subsonic velocity.
Oh, and out of curiosity, I tried snapping a gascheck onto the bottom of the boat tail, and it fit perfectly, so I may try them with gaschecks at somepoint.
This group was shot at 100 yards and about 12 grains on WC680.