Re: 6.5-300 wsm pressure signs
I did use a chrono and i got between 3100 and 3330 with no signs, no heavy bolt lift, no flatened primers, and i didnt see any ejector marks at that time although weather conditions werent the greatest so maybe i just missed them. At the 68gr load I had heavy bolt lift and a flat primer and a visible ejector mark. My velocity also jumped up to 3420 so I stopped there. I know these are very fast velocities for that round and I was unsure my chrono was reading right because I would expect to have some sort of sign earlier in the proccess. The ejector marks are so faint that I could only see them after I tumbled the brass and instpected each case under a good light. I was using 140 bergers through a 30 inch tube. I thought I started low enough after I compared the difference between the 300 wsm and the 270 wsm with powder charges and applied similar diferences to my 264 and the 270. I also looked at the heavy for caliber 160gr 270 wsm starting loads and made sure that i started below that as well since 140gr in a 264 is similar to a 160gr in a 270. Oh well I guess I will go back out this weekend and start from 50gr instead of 60gr and redo the whole thing. I would like to know if anyone has had this sort of thing happen with wsm norma brass. Thanks for any help.