Just figured it out on Sunday at 105 degrees in the sun. It was just the thristy grasshoppers and me out there. Berry round nose 180's fed the best, at 1.180 to 1.185 with 3 of the 5 Tripp magazines. Other 2 Tripps nosedived the rounds for FTF. Tried using some very old mags, 8 round McCormicks and those fed quite well regardless of bullet type or OAL. So looks like it is a feed lip issue - which I did not yet correct to 0.394 but will now. Mags are numbered and their functionality was recorded to match up corrective action. Limited 10 here we come. Thanks all!!
Another writer asked about Trojan 9 - I use Tripps 10rnd mags for single stack and they have functioned flawlessly. I've also used his 9 rnd mags in the past when that was there only option (1st gen), and those worked without hiccup too.