Sir;
My recommendations below are given through what works best not based on what is the most expensive.
The 68 gr. Hornady in my experience is a fair practice bullet. When bullets become "available again, get yourself some 60 gr. Sierra HP's for your 200 yard matches. One thing, you don't need a boat tail bullet for 200 yards and the 60 is just plain and simply put, a very accurate bullet! Least expensive too!
Your okay with RE-15 and later on, you may want to use Hodgdon or IMR-4895 with bullet weights under 77 grain. RE 15 is better suited to the heavier bullets like the Nosler or Sierra 69's,77's and 80's.
I have found that the carry handle scope mounts are not well suited to load or accuracy development due to the scopes height in relation to your position behind the rifle.
Since you are getting more serious about the sport, I would recommend the following up grades ASAP. RRA NM rear sight. Rear aperture .040" diameter in 1/4 x 1/4 minute. Front sight post width to suit your eyes. I am old now but even twenty three years ago I shot best with the standard battle sight width which is what you have on your rifle now. The .072". Smoker up good! Second, you need a RRA NM float tube!
If your averaging near sharpshooter scores now, your ready for better bullets and need the two up grades I listed above.
Continue with your good shooting and always remember this. You will only get out of High Power what you yourself put into it! And I don't mean money
Edited to include getting a trigger upgrade in addition of the sights and float tube. Get RRA NM trigger! Right out of the package a great trigger!
Dave McGrath