Originally Posted by toddconley
I was a huge RL 17 fan. The velocitys were awsome. Gun shot great. Presures were fine. Then I show up at a May match with temps in 100s. Couldn't open my bolt and almost shot over a berm @ 750 yds. Took myself out of the match for safety. I will not shoot it ever again in my match rifle. I probably will in some of my hunting guns but not ever again in a match rifle. I am now shooting 4350 almost 100%.
Some combo's will run 75 Kpsi without showing a hint of over pressure. I played with a strain guage on my last 7stw, and I was getting 58 Kpsi on one combo with rl25, but I went to 7828 and similar vel. and pressure signs were netting 70 Kpsi. A bit too much temp. would have gotten me a sticky bolt. You've got to either actually shoot in the highest temps expected or leave a bit of headroom for temperature.