every single rifle is a completely different animal. No two rifles are the same, even custom guns using barrels from the same manufacturer. Everything from the tolerances of the chamber to the density and consistency of the steel change how a gun delivers its results, and therefore, when developing an accurate load, it is vital to use the firearm in question. Another key variable when creating match ammo, is the seating depth of the bullet in relation to the LANDS. Tactical and gas gun shooters think in terms of fitting their magazines, and thus they use the Cartridge Over-All Length (COAL) as the basis for making ammo and match bullets and magazines often don't mix well. Your gun is a single shot, so ignore all references to COAL.
I can't help snorting when I see posts asking to share load recipes because rarely do two guns work at optimum with identical loads. I have many custom BR and TR rifles (and now F-Class) and no two use the same formula.
Also, bolt actioned rifles are so far superior to gas guns in accuracy as to make the idea of testing ammo in an M-14 a non-issue.
Learn about measuring the distance to lands in your gun, get yourself some proven f-class bullets (I strongly suggest the Berger 185 grain "Juggernaut" or the 155.5 grain Berger Fullbore Bullet) and start load developing with these bullets just touching the lands. When you find a powder load that works, then work back in .005" increments to find a seating depth in relation to the lands that produces the best results. viola... you have your load (PS: Varget powder is seldom the wrong answer in your rifle)