Consider changing your ignition source if you are using 209 primers. There is a lot of good data being generated that shows that 209 primers are just too powerful and are the source of inconsistant accuracy. Go to prbullet.com and read what they have to say about switching to one of the small rifle primer ignition systems. The small rifle primer and Pyrodex loose powder combination is the most consistant system I have found. I also got away from Powerbelts for poor bullet performance. I found they were a very soft bullet and were flattening out on impact rather than mushrooming. I did not feel I was getting the penetration with them that I should.