Ill try to make this as short as possible because people dont like to read long posts.
I shot 3 rifles today. 10 rounds using dry medium to clean the brass and 10 rounds that used stainless pins.
All three rifles MV dropped an average of 15 fps. I would think this may be due to less neck tension but honestly I also just opened a bottle of new powder when I started loading the stainless rounds so it possibly could have been the powder.
Next the SD and ES on all three rifles improved from dry to stainless just a couple points but improved nonetheless. I cant tie that change into powder so maybe there could have been lighter neck tension but apparently more consistent.
But last issue and the one I need help understanding. My rpr 243 and the 6.5 creedmoor both have somewhere around a 5 SD with an es in the teens. My 260 on the other hand has an SD of 11.8 with the stainless and a large ES in the 30's. I looked back at a year ago and it is about the same. On paper at 100 yrds I can make one ragged hole with 10 shots off of bags so it appears to perform well. Does my rifle not like that load as much as I think it does? Should I go back through load development again? I can cover the hole of ten rounds with a dime. Why do my numbers say other wise? I am confused. I take all of my reloading through the same steps every time. I anneal every time so the neck has the same properties every time. The only things that come to mind are the large jump around 30 thousanths and the possibility that my rifle just is not in tune with that charge weight. Any thoughtful input would be appreciated.
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