Well, started load development for the .260 using Hornady 143gn eld-x bullets. Powder charges started from 40.5gn of AR2209 to 41.7gns , Lap brass, Fed match primers and all bullets seated 5 thou off lands.
Three shot groups at 100yds with the smallest group of .546" and the largest of .794....all charge weights were increased by .2gn increments.
The best groups started at .640" 40.5, .566" 40.7 and .546"at 40.9 , with group sizes starting to open up at 41.1 for .716"
The next batch of rounds will be 40.6gns, 40.8 and 41.0 ....then after that test I will be tinkering with seating depth to squeeze as much accuracy out of the Horandys.
Iam currently loading 5 thou off the lands, do have any suggestions for seating depth?, I have read anywhere from kissing the lands , right out to 25thou off.
cheers,
Sean
https://youtu.be/NtrBhEEe7ek