in weight maybe.

150gr loads are just to much and not needed for short range shots. A honda civic is going to impact deeper into a cement wall doing 80mph than a lamborghini doing 150 mph.

It would be interesting to see your results if you were to drop the charge down to 80gr loose pyrodex and give it another round with either the 245 or 295.

The slower moving powerbelt will offer deeper penetration.