@Bull67 ,
Welcome!
Sounds like a nice rifle. Pictures?
Barrel contour? 1-9 Twist?
284 Win is one of my favorites.
I love the 284 Win family of cartridges as well, as I have the 6.5-284, 25-284, and 6-284 in fast twist specialty pistols as well.
Several Sunday's ago, Glenn and went out and I shot the 6 GT and my center-grip 7mm SAUM XP's at 300, 510ish, 6650ish and at 1011 yards.
Glenn shot a couple of his XP's too.
I was very pleased with the accuracy of both XP's
6BR versus a 7mm SAUM/180 Hybrid's is not fair-You shot and read the wind excellent.
FWIW - I would never use a 6BR, 6 BRA or 6GT for 1000 yard F-Open, unless it is the only thing I have to shoot.
I am looking forward to you getting spoiled using a joystick rest.
When I started using one around 18 years ago, my first comment to someone or myself was, "It feels like I am cheating."
This is just statistics, but I think it was last year for F-Class Nationals and the South West Nationals...
Just use regular powders for long barrels.
I don't always use The Slowest Powder, but sometimes I will use one just a tad faster then the slowest.
Example: 15-18" 6.5-284 I typically use H-4350, but I have also used H-4831sc
A review by me would be self-serving and biased, simply because I am the US Dealer for SEB Rests.
My website: NEO-X, MINI-X, MINI, Trident, AR250, and the JOYPOD-X (It is a comp bi-pod).
https://sebrests-usa.com/
Seb's The one who actually makes them website:
https://sebrests.com/...
Here is what I use the majority of the time...
I can shoot very tight groups with various bi-pods and various rear bags from the bench.
Here is what I use for comp load development.
Custom actions with high end barrels that are heavy (mine are stiffer as well for the contour chosen, because they are short), puts a lot of things in my favor.
Our thoughts exactly.
Plus, it was windy when Glenn did the 4 different groups.
We don't even have 50 rounds through the barrel yet, and I have more brass that needs to be fired for the first time.