Good idea taking pictures .I took a photo of the position of the rear sight and put it with my notes on that rifle in my phone, months back. I checked the position of the rear sight elevation last night. I didn't move.
Yup I'm using H110 for .30carbine. 14.7gr with a 110gr bullet. Each case trimmed to 1.280. I'll shoot it for score a few more times this summer, making note of where I need to aim it to keep it in the black, and then try again in late Fall and see if there's any difference. I'm used to shooting rifle with a peep sight (FAL, AR, Carbine, Garand) so I don't think it's that I was running on a different sight picture last time. I put the top of the post dead center in the aperature, like I always have.