If you’re going by published tests, be sure to look at the details and not just the averages.
On Lucky Gunner, the Remington 158 LSWCHP +P shows a respectable average expansion of .54 from a 4” barrel.
Drill down the detail, though, and one bullet out of five expanded to .75, skewing the average. The other four showed no significant expansion.
https://www.luckygunner.com/38-speci...rounds#geltest