I too tried the 88 ELD's this morning. Ran them through a Rem 700 with a 25" varmint contour 1-7 twist McGowen barrel. I chambered it with a PTG match Valkyrie bolt-gun match reamer, .050 free bore. The 88's shot a .34 group at 100 yards. Once I shot them at 500 and 800, things fell apart. I could not keep them on an 18x24 steel plate. I also tried the Hornady factory load and it too had the same problem. Just for reference, I shot the Federal 90gr MatchKings and no problems. At 500 they stayed inside 1.5" with little effort. It seems the Hornady 88 is just a little too long for a 1-7 twist. This is confirmed by the Berger website that indicates the stability is marginal. Running the Sierra 90 through the same program indicates that it is very stable. So for now, the Hornady's are getting set aside and I'm sticking with the Sierra's. As far as I can tell, the Hornady's are going to need a 6.7 twist or 6.5 barrel to shoot at extended ranges. Here is the load info:
Hornady 88gr ELD
Aliant 2000MR 25.5gr
CCI 41
Starline brass
Col 2.290 .060 off the lands
Vel 2720