RL-26 is a dense powder so more can be fit in the cases. It drives 100 gr over 3300 on my 257ai and no pressure signs at all. Just happened to hit a sweet node at 3325. The burn speed was too slow to work in my 250 ai though but RL-16 worked great hitting a node at 3050 and no pressure signs with 100 gr. I did push IMR-4166 in my 250ai to the point of extractor marks in the brass and Quickload estimates pressure of that load to be 74,000 psi so By the time you see brass flow you are well over pressure. There still was no hard bolt lift just a faint ejector mark. Something to keep in mind while hotrodding those target cartridges.