hiccup in reloading 175 in 308 win

[rsmithsr2]

ok i have a thread on the factory rifle forum on a savage md 12 i replaced the factory bbl with a 30" 1/10.
all went well with the first 50 rounds long loaded 175 berger target, h4895 palma brass just weight sorted.
vel 2810 or so, es/sd of 4 and 8. life is good just over .3" 5 shots at 100.
annealed, sized and reloaded 15 to shoot 100/200/300 zeros. sd and es goes to schitt. from 280x to over 2830, put a hole in a primer! load is dropped lite from a charge master lite to an fx120i and brought up to weight..easy number 43.0.....
opinions on what changed from new to once fired ?? sized case vol is 55.4 about 1 bigger than new vol.
going to do a case analyze and use that for the next batch ......only 5 or so to shoot against 5 new at 600 yds.
what be happenin"

 

[rsmithsr2]

well i shot at 600 and no real difference between new and reloaded, both were faster than the original load. aver was now 2826...and some cases have minor ejector swipes...so i loaded 10 and 5 again for 1000...but i dropped the charge to 42.8. the 600 dope was within an 1/8( one click) at 600///so good to go for sat if the rain stays away

 

[rsmithsr2]

so in spite of early rain we did shoot at1000 today...closer to 10 am start.
so dropping the load 0.2 took me from 2826 to 2800 even with no spikes. must be a hidden pressure spike right there. very strange. so the come up was 31. with a 8 /21 , and the new brass with the exact same load did 2794 with 2 /4.9. i do not understand at all. i have a 1k zero and a 600 zero, if i can catch a palma practice maybe get an 800 and 900 zero.