8208xbr pressure signs with 308?

[Barelstroker]

I personally think it's something I may or may not have inputted into GRT. I have 4 different sets of brass but use the R-P mostly.
All of these cases have been de-primed, tumbled, annealed, FL sized, trimmed, the whole nine yards.

RP brass Win Fed Win (dots on headstamp)
165.6 176.6 176.6 155.8
166.1 178.1 175.4 155.8
166.0 176.8 175.6 156.5
165.9 177.6 175.7 156.3
166.7 176.9 175.7 155.2

View attachment 8507531 View attachment 8507532View attachment 8507533View attachment 8507534

The gun is a stock Tikka CTR 20" 308 that all I have done to it was change the stock, trigger spring, and added an APA little bastard.
View attachment 8507539

The data I input definately isn't jiving with the program. And Like I mentioned, I probably have less than 2 months of playing with this program. I've always used a manual, data from the bullet manufacturer or powder manufacturer. So I'm sure I don't have the data input correctly. But the one thing I can say it that at 45.3g of 8208, it's not 102.7% load fill.

RP case both filled to max load from my testing.
45.3g 8208 is at the case / shoulder junction
View attachment 8507548
47.5g Varget is at the base of the neck, thus lots of crunch when I seat to 2.216" CBTO or 2.835" COAL
View attachment 8507549

And seated as such, the base of the bullet isn't even to the case/shoulder. When seated I can shake it and hear the powder moving back and forth. So far from compressed like Varget.

That bring me back to the GRT program. I think my data that I input is wrong OR my inexperience with GRT is the issue.

Just to be sure, are you trimming the cases to length or at least checking case length with every reload?

 

[Sdupontjr]

Yep, sure do