Stillpiercer has lower zoom than ambush scope

I just measured the zoom difference between stillpiercer, longview slr10, and ambush. I play on a 115 inch projector screen so the numbers may be huge. I performed the test because I could not find a definitive answer as to the zoom of the stillpiercer. Some wrote that ambush is a lower zoom, while others said the opposite. Anyways, here are the numbers.

Longview slr10: 22 3/4" Ambush: 20 5/8" Stillpiercer: 18 7/8"