Dogleg, let's break down your post. First off, congrats on MOA at 200yds. Might surprise you at how good that really is. If your rifle continues to be consistent at MOA, at 1500yds, you can hit INSIDE a large pizza. At 1000yds, inside to garden variety dinner plate or milk jug everytime!
You are not building a BR rifle but something that can withstand the rigors of field use, ie hunting, AND still put them where they belong - boiler room.
Let's quickly cover what should be just fine. The scope will do you just fine. In fact, with 29min of up, you can go to 1100yds right now. Put them into Burris rings w/inserts and you can consider the mile a possibility.
If you are using turn in rings/baes, get rid of them. There is simply too much slop or places to go loose. Weaver bases and rings PERIOD. Blue loctite on the hardware. Epoxy under the bases.
I like a trigger at 1lb or less for this type of shooting. High trigger pull weights require a firmer grip on the rifle which can cause you to pull during recoil. Not ideal.
To improve, try other bullets. All barrels are picky and you have already proven that Sierras shoot MOA. Try Hornady Amax, Bergers VLDs, and Nosler Accubonds. All excellent bullets that are BR accurate. Variations in bullet diameter can have a profound effect on accuracy.
Switch to the Lee collet sizing die or get a runout guage and check your ammo. Ammo with bullet runout over 4 thou needs to be addressed. Use Fed 215M primers
What type of rests are you using? A solid stable and wide proper pedestal front rest with conforming bag front and rear? Shooting off a concrete or other solid bench? Using wind flags? Resetting your rifle to exactly the same point for every shot? Controlling the trigger pull and follow through?
All the other BR shooting techniques that can lead to teeny tiny groups?
It only takes a very slight nudge to send that bullet 1/2" off course at 200yds. Shooting form with a hard kicking rifle is very difficult to keep consistent. Put on a muzzle brake, limbsaver recoil pad, add as much weight as you can - be able to spot your own shots. That will likely cut your group size by 1/3.
Keep an eye on vertical stringing. That'll kill you at long range. Why match primers and quality powder are critical. Give Retumbo a try too.
Recheck your bedding. That recoil lug must be supported on ALL sides including the front. The action should not be easy to take out of the stock. You have alot of recoil shaking things apart. Doesn't take much to cause your action to shift and with it, barrel harmonics.
With more rifle tuning, and load tweaks, you should have a rifle that shoots at or near 3/4min. Maybe even close to 1/2min. That is within spitting distance of a BR barrel spun on that action.
Anytime you have a hunting rig shooting sub MOA, its a keeper. Read my articles that are linked in my sig for more info on setting up your rifle and loading.
Jerry