Years ago (back in thw Windows 95 days) I had a program (Nosler, I think) that you could compare two loads, say a 30-06 150gn and a 165gn load.Is there a modern day program that has this feature? Thanks

Couple of them.

Ballistic Explorer which was a favorite of Ken Howell, which I like too although it can be tough to wade through.
Sierra Infinity which I find is simpler to get what you want without a lot of fuss.

https://www.sierrabullets.com/product/infinity-version-7-exterior-ballistic-software/ (Wow on sale 20 bucks off.)

https://oehler-research.com/ballistics-explorer/

Thank you - For $15 ya can't go wrong!!