I use it and find it accurate. I used it to help me design a new improved match hornet to shoot 40gn Hornady V-maxs out of a Ruger 77/22Hornet Varmint, Quickload predicted 3300fps with Win 296. To which I thought rubbish you can't get that out of a hornet but when chronographed with my Oehler 35P the load was within 3fps of that predicted I was very impressed.
I was developing some load data for a suppressed 44magnum with Vihtavouri shotgun powder and the velocities were 100-300fps slower than predicted it was barrel friction slowing them down (like 22lr ammo in long barrels begins to slow down after about 15"). I then adjusted the 'long barrel friction' and now Quickload has predicted velocitys consistently within 20fps (most of the time within 3-12fps) with velocities rangeing from 600-1200fps.
I find it a incredibly helpful program especially when you are developing wildcat ammunition load data.
[ 02-19-2004: Message edited by: subsonic ]