That's a lot of the problem with the 28 twist 50 Cals unless you're shooting big lead you're kind of limited if your goal is to go long distance with a sabot ,I agree that 300 grain Parker ballistic extreme would be a good bullet to try. We're all of the old 700 mL 28 twist or were some of them 26?. I have shot 28 twists rifles a lot I've spent so much time with 45 Cal smokeless, I have a project I'm working on and when it's completed I'm going to step away from the 45 and turn my attention to the 50 cal I'm I'm going to start with a 24 twist I'm going to order a 22 twist and then a 20 as I can afford each I have a feeling when it's all said and done that I'm going to find a faster twist 50 cal to be much much more versatile than the 28 twist we're given today again my goals will be accuracy and bullet diversity I want to be able to shoot heavy 452's in a harvester black or heavy 454s in the orange sabot, get the velocities that I want, shoot longer distances and shoot groups that are bullets touching I cannot do that with what we're given in our market currently, I know you can do that with big lead, I want to do it with jacketed bullets, and with bore riding again I want to be able to shoot anything from a 325fury up to a 500 grain,,,,,,sabots 250-400 gr .452s when I get through all that I will have an idea of what I need to put in a 50 cal to go to five or six hundred yards it's sure not going to be in a 28 twist Barrel.