I have a bunch of Berry 124g DS RN bullets. I'm using Tightgroup powder and want to get the fastest load out of my SBR Uzi without running into any issues. I went to http://www.hodgdon.com/ and used their calculator and was a bit stumped. Berry says to use lead data for their products. Hopefully somebody with better knowledge than I can jump in with a powder load that will work. Thanks.