I’ve been working up a load in my 243 with an 8 twist, and could use a little advice. Do the Sierra 107 grainers like to be jumped or jammed. So far I have worked up a powder load of 42.5 rl19 and a jump of .015 and am getting half minute accuracy. I know my gun can do a bit better. Has anyone had experience jumping then more or jamming them in 10 or 15 thou?