I run IMR 4198 38.5gr under a 325gr FTX with a COAL of 2.200. Mine is a mid-length gas system and Lil gun would not cycle reliably. Velocity is right at 1700fps from a 16.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Derek01</div><div class="ubbcode-body">Have you looked at Teppo Jutsu's website? They list several loads. I emailed them a while back and they sent me a spreadsheet of their pet loads
You'd be better off going to the forum site for load data. I don't have my loads in front of me, but I have posted a few over there. Lot's of great info on that site if you're a 458 SOCOM owner.