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Marty Henry, might be worth doing a side-by-side comparison of several different ballistics programs.

I've just done a quick n dirty with Strelok+, Sierra Bullets Infinity, Professor Pejsa and...

Well I knocked up ten OBT predicted rounds this morning, the load is quite close to my OCW load which was a bit temperamental. Minor adjustments to powder charge and seating depth. I went out and...

https://pierrevanderwalt.com/obt-calculator/

This will help.

It's a major league brain ache, the Optimum Barrel Time theory, but worth working through even its its just the summary.

Pick a...

And the problem I have is what is real world velocity?

The values my two chronographs return at 15ft are never remotely close to what the validated trajectory function in Strelok says it should...

Funny, I got a tip about this from a mate in the UK just last week and also have been reading the exact same stuff. Haven't had the chance to do any load development yet but this comment above is...