I don't know why you would be opposed to loading reduced power centerfire ammo while the novice shooter builds a foundation of basic marksmanship fundamentals. Light recoil and blast reinforces the idea in the new shooter's mind that there is nothing to fear from shooting a "big" gun, and it won't hurt him, and thus promotes rapid advances in both confidence and competence. If budgetary concerns are a primary consideration, light to midweight, inexpensive bulk or even cast bullets can be shot effectively over light charges, reducing the cost of powder. The least expensive marksmanship training is through dry firing, where no primer, powder or bullet is consumed, and no trip to the range is required, thus the cost is nil, and the additional benefit is that recoil will not mask their mistakes. A coin rested on top of the barrel near the muzzle will let them know when they get it right and when they don't. To my way of thinking reduced loads provide a win win situation, the novice improves at an accelerated rate, thus fewer rounds are fired in order to reach any given level of competence. As the novice's experience and prowess grows, the powder charge and bullet weight can then be increased as their comfort level allows; but there will always a place for a light plinking and small game loads in a big game rifle.