A post with more information on the Oehler 88 at 2 miles would generate a lot of interest. Details on the downrange target and some sample data would really be appreciated.
In one of the papers on the website, Oehler wrote that under 1K yards, it doesn't really matter if you use G1 or G7 as the BC model. I was surprised by that, so I checked it by comparing range cards generated with each model. With the advent of CDMs, I added those to the mix as well. This is what it looks like for the OPs ballistics.
I started with the values in AB Analytics. Then I trued the G1 value to give the same drop as the G7 at the OPs last target. Looks like Oehler had a point. G7, CDM, trued G1 are on top of each other out to the last target. I also fit a straight line. There are at least of a couple versions of this out there. It's basically a mnemonic trick to avoid memorizing ballistic tables. You have to multiply and add in public and under stress, but it can work pretty well out to 6-800 yards with suitable cartridges.
Zooming in on just the errors, these are the differences at each range between the methods in the legend and a G7 range card.
It's not that G1, G7, CDM, or 4Dof don't give different results, it's that 1300 yards isn't enough range that they become significant. This graph also has a curve where the G1 was trued at 4K yards which is the last value in my template. This is intended to demonstrate that no, G1 and G7 are not the same.