I am very new to reloading. Just started with my 260rem. I did a lot of research and noticed that 4350 was a good powder to use so thats what I wanted to start with. With supplies being very hard to find, I was able to find some A4350. With a practice I was quickly able to cut the size of my groups in half. The problem I'm having is the differences in speed each round has. They very any where from 1-70 fps. I was very precise with my powder. I weighed each charge with a digital scale to make sure they were exact, and used a trickler to adjust. I evan double checked a few times to make sure. Is this problem caused by the type of powder I'm using or am I missing something?