Great progress and great questions.

I’ll defer to those more knowledgeable regarding changing the load before trying a further distance. If it were my rifle, I would keep the same load and see how it does.

Re the cases, if you can seat a bullet without resizing, and finish with good retention after seating, I would go that route. The thought being the less you work your brass, the better.

Loved your comments about Dacron’s BC.

Congrats on the progress.

Chris