Originally Posted by JOHNNIE WALKER
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?
I would guess that your powder charge accuracy is not the driver of your velocity inconsistency. There are a bunch of things guys do to reduce velocity extreme spread (ES). Changing primers or powders, making sure neck tension is as consistent as possible, finding a "sweet spot" for powder charge, playing with seating depth, etc.
Before you go about changing a million variables, I think it would be good to look into some areas that may lead you to believe you have an ES issue where none exists:
What Chrony are you using?
Is your 70fps variance in the same day of shooting?
Are your loads at outdoor temp when you start and stop shooting (not from a warm car or pocket)?
What is your routine (cooling between shots, cleaning, etc)?
What are your groups, and at what range?
Is the ES that you are observing effecting your drops at the range you hope to shoot?
Sorry for the 20 questions, but the more we understand about how you are getting these results, the more likely you are to get advice that can get you to an easy solution.