300 shooter,
I have the Oehler Ballistic Explorer program as well, and it's pretty nice too. The RSI SL beats it hands down though... The Shooting Lab will compare 6 combinations at a time if that's what you're after with it.
Oehler uses the same 100+yr old formula to calculate their trajectory, just like all the other ballistic software programs do.
I recently found a problem with the Oehler BEX program and never did locate the cause, the only reason I spotted it was because I was running an identical load with all the same perameters in it at the same time, but trajectories were different by about 5" at 1000 yards for some reason. I've never trusted the software since, although I've tested it several times and have never had it do it to me again. Maybe the new version corrected this problem. Had I known how to print screens back then, I would have sent Dexadine the screen dumps from the test that did this so they could have looked into it.
You'll not find better ballistic modeling software out there than RSI SL, not to mention everything else it does in addition to that, I'm sure you've seen it tho.
Dexadine wrote the BEX program for Oehler many years ago, as well as the one for the Oehler Model 43 PBL, and both leave a lot to be desired by todays standards and advancements. There's been one upgrade in those years that I know of, and I don't see anything new in it either, compare that to RSI SL's continuous advancements and upgrades, all with a guy to back it up that knows his **** too.
Good luck which ever way you go.