Hi all, well you folks recommending the small rifle primers were right, at least with 2400. With small pistol magnum primers I was still getting inconsistent ignition with 2400 with poor accuracy so I went with CCI-450 and Remington 7 1/2 primers. Much better ignition and accuracy but still not quite what I wanted. With the Rainier .312" 100gr plated bullet I tried 2400, Bullseye and Tight group with no joy. Then loading 4.5gr of Unique with a Federal 100 primer and a firm crimp, joy was found, nice tight groups (for me with the challenging sights on the M&P) spot on the POA at least at fifteen yards. Now I need to load up and check it at twenty five yards. I am only neck sizeing the Starline brass as this S&W M&P should be my one and only 32-20 and doing so seems to work. If this works out I don't think I'm going to gear up for casting for this little beastie as I really don't think I'm going to shoot it enough to justify the cost. My thanks to all for the advise on the previous post!