Well I made one last quick trip to the range to check my scope before I am gone hunting this weekend (Antelope).
I had decided that 75gr H870 & a 140gr Accubond @ 3206 FPS was a go. The last time I was to the range with that load I had no hard extraction or pressure signs & was shooting groups like I did today.
The first shot was the hardest extraction I've had in a long time. It came out after but took a good pull to get it. The other 4 were sticky, but not bad if extracted immediately .
The case just above the belt measured 1 1/2 thousandths larger than another load I had today. It was 76.5gr US869 & a 140gr Accubond. I was getting an average of 3103 FPS with that load but no where near the accuracy of the H870 today. The Chrony failed to read when I shot the H870 group today :(
Temperature & conditions were about the same both days of testing. The only thing that has changed between the 2 days is this is a new bag of brass (Win cases again). I did notice that neck tension was more on this lot than the last. It is by no means tight, but it is more snug when seating.
My big question is how much to back down without affecting accuracy? I don't want a tight extraction in the field on an animal. I also know the sweet spot is going to be between 74 -75 gr as the groups didn't really tighten up until I hit 74gr the last time with H870.
Not sure what to do, no time to hit the range again & don't want a failure in the field.