I had tested loads with my 26" build using RL26 and 143ELD-X bullets and had gone to 3054 fps with them out of my 6.5 CM without seeing any pressure signs. Primers looked good, no hard bolt lift etc. My Ql had showed the charge of powder to be within normal pressure range, but I had not adjusted my QL to match velocities I was getting. The following day I retested without my Magnetospeed attached to see if groups would change. I had about 100 rounds without cleaning my bore and this time when I reached the load that gave me 3054 fps I had extractor marks on case heads and 2 primer pockets were lose. When I looked into it I found that I needed to adjust my Burn Rate Factor / ba to match my velocity. That put pressures to a much higher than CIP rating and why I was seeing pressure signs with a dirty bore. It was producing pressure around the 70K+, remember pressure signs won't show until you are usually over pressure. When you see over pressure signs you need to back down to a safe level. My load with the 143 ELD-X is at 3000 fps now with HBN coating and RL26. When you are at the point with pressures with the load you are using it dose not take much for pressure to spike, Temperature, dirty bore, etc.Awesome replies guys. I tried the burn rate adjustment prior to posting but like you said it put pressures to the point where I would thing primers would be flat, cratured, bolt lift issues and maybe hurt the rifle.
Bowfishn I will fill a case of RL 26 like you asked for. You guys amaze me with your skills on QL.
I like velocity like the next guy but I'm just hoping at 69.5 I'm not hurting my rifle. The first day 69.5 grouped well but the second day wasn't as good because I think the shooter (me) was needing and wanting it to perform so well that I was pretty amped up. Then I assumed the 70 grains would be too much pressure and I had almost zero concern or investment for it to shoot well and it was my best group. Now my brother in law pointed something out that was kind of interesting and I realize this doesn't count and am not trying to sound better than I am but I shot groups of 3, 5, 5 and he noticed 9 out of the 13 shots if they were superimposed would be in roughly a 1/2" area. In that way considering I've tried 1 seating depth and 2 powder charges I'm pretty happy. I obviously want to keep working at it and need to learn how to fine tune it so any tips on where to go from here would be appreciated. I don't want to hijack so you could PM as well. So let me look at some of the suggestions and I'll get back with you guys.
Just saying be careful.