Those conditions would be when Bob STARTS his run up to 3Kfps! LOLIs the case head is starting to show some pressure signs?
Hard to tell from a pic, but possibly a little bit of firing pin cratering on the primer and a visible ejector mark. Whether that's "near max" or something more, it's worth looking at (IMO).
The primer isn't flat. I see no ejector marks and no catering that I can see
The pressure test that I had performed on 64 grain loads averaged 53,700 PSI
Has to be the light because I don't see that when I look at the case. Primer indent looks the same as a factory load in this rifle.
I can't see pressure jumping from a 5 shot average of 53,700 PSI at 64 grains to being over pressure at 65 grains.
Speer data shows 64.1 grains CFE223 behind 250 grain bullet for 2664 FPS. I'm at 65 grains with 4" more barrel length. At 15 FPS per inch added to 60+2664=2724 FPS and I'm at 2731 FPS.
That doesn't seem out of line to me
I had those loads pressure tested
View attachment 525406
I posted the pressure test result. Not a computer program. That brass has been realized before. Reading primers and looking at case heads is not an accurate way of guage pressure at allI am in no way doubting your experience as a hand loader, but I too see a problem. Probably pressure, but could be excessive headspace.
To follow up @Inline6 are those loads just calculated through a computer program, or with pressure testing equipment on the rifle?
I noticed Nosler has no published data for the 250 partition and CFE 223, while borrowing data from Speer is a good guide, it’s possibly the nosler builds more pressure.
I think it’s worth comparing the brass from lighter loads.
@jwp4751885 Highwall 28" 10 twist barrel, Fed 215 primer RP cases
65 grains of CFE223
View attachment 525412View attachment 525413View attachment 525414
I posted the pressure test result. Not a computer program. That brass has been realized before. Reading primers and looking at case heads is not an accurate way of guage pressure at all