I don't remember the jump but it was not much. My COL was 3.112". I am shooting a 28" barrel, using RL-16 which is more expensive in OZ than here in the states. But, I am driving them mildly at 2825 fps. My 600 yd group was 2.04" and the 1000 yd group was 3.56". I have shot slightly better groups with my 6mm, but not by much. I'm going to try 6mm ELD-M next!
I tune my rifle using the "blue book' from the Australian Rifle Association, forgot the writer's name, but he espouses characterizing the barrel with round robin 5 shot groups of a ladder of loads (I use 1% steps for 5-6 steps) and put the Mv, SD and ES on EXCEL with ES vs load then use the curve fit to develop a 4th or 5th polynomial curve. I use the null from the curve fit instead of trying a bunch of bullet positions as I believe "finding the jump the barrel likes" is just a more exact load than the usual ladder test. The book then goes on about how to cut the barrel short for final tune. I instead use my Australian made tuner to come to final load tune.
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