Every rifle is different and I prefer to know exactly what my rifle likes the best. Just my way...I start with a low load and start building in 10gr increments. I chronograph and measure every single group shooting off a rest with front and rear rests. If my rifle will take a scope I mount a scope for load development. I will surpass the 120gr max or 150gr equivalent by at least 10gr. After I determine what my rifle shoots I will take the best two loads and try them again and go 5gr on either side. I start with the stock sabot's, but I also try different sabots with the loads that shoot the velocity I want to see if I can increase the accuracy.
Yes I do that with several different bullet Sabo and powder combinations and pretty much know exactly what my rifle will shoot with just about any decent hunting bullet/sabot. I even try bore sized bullets in that mix. I shot all the Barnes 250, 290, 300 bullets and across the board they were the most accurate by a small margain over the Lehigh Bullets and MMP sabots. Those Lehigh shoot really well but so do the Hornady XTP bullets. Some say I'm splitting hairs....and I agree fully!!