SaxonPig, I'm ready for our third installment.
"Not sure why you want to bother testing ammo at all."
Oh boy. Wow. Perhaps you've only been to shooting ranges. Well let me share the joy with you. Having a vast desert for a legal plinking ground is the most fantastic gift for a gun owner. I can't think of a time when I haven't tested ammo when I go shooting in the desert. I love it. Love, love, love it. I don't know who wouldn't love it. I've tested ammo on tires, potatos, huge drum barrels. computer parts, tvs, speakers. It's a blast, and SaxonPig, if you ever have a chance to plink outside the range, I highly recommend it. So I guess that's my answer to the question. I do it for the intrinsic joy of shooting things.
"It's already been done many times and the results can often be found on the Internet."
I know, and every time I read about those tests, I've thought, I'd love to try that.
"I found several such sites with ease."
I love Google.
"I note in the first tests that although the 147s did expand, the 115s actually penetrated slighter more."
It sounds like your original premise just got flip-flopped, and I need to shoot the rest of my hunk of junk 147s and buy as many of your 115s as I can so I can get back to penetrating and testing ammo in the dessert. Actually, though, I'm just a dumb idiot, and I'll probably keep my 147 grains.