Much prefer the SP101 personally. I cannot warm up to the GP100, just too big and heavy even to consider for outdoor carry. It weighs as much as my blackhawks! I have a fantastic medium frame Taurus M66 I like a lot. No, it's not as strong as a GP, but it'll last my lifetime I'm quite sure. I have a 2.3" SP101 I carry a lot in thunderwear. It's a great gun, the smallest gun I can fire heavy loads from comfortably. I have a Hogue monogrip on it. It's quite accurate. A 3" gun would compromise very little for portability and give you better sight radius and ballistic performance. I bought mine used and the price was right, $250. I wasn't going to quibble over another .8" of barrel.
I've got a good line on a used, but like new Ruger Security Six stainless 4". Guy wants $250 for it, very reasonable and about what I consider the gun to be worth. He also wants a .380 and I have a good .380 to use in trade, so I'm going to maybe make a road trip this week.
I had a Security Six, was my first center fire handgun. It wasn't perfect, didn't like .38 special too much, just so, so accurate with .38s, but was quite accurate with magnums. It had a lot of felt recoil, though. I think my SP101 is more comfortable to shoot. However, I miss the old gun and would like to have another and have been thinking of getting a P3AT to replace that .380 in my collection anyway. Sounds like a no brainer swap to me.
I've offered him the .380 plus 125 bucks. The .380 is an old Grendel P12, 100 percent functioning, but not a lot of value to it. I'm trying to be fair with the guy while satisfying both of us with the deal. We're going to find a range and do some shooting first. I wanna make sure he can handle the trigger on that thing. I shoot it well, but I shoot DA pretty well. It's a rough trigger. But, he says that it's just what he's lookin' for, so we'll see. But, I don't want him mad at me if he don't like the gun, LOL.
The Speed Six is the same gun with fixed sights and with a 3" barrel is not much, if any heavier than an SP101 and holds an extra round. The Security Six I'm looking at is a 4", but I think a 3" Speed Six would be an awesome carry piece if one could be found reasonably priced. I also have a 3" Taurus 66 (yeah, I'm .357 poor, LOL), about the size of a speed six, and it's only marginally heavier than the SP101, but the grip is a bit bigger to conceal. I have a Hogue on that one, too. But, for CCW, I'm quite happy with my SP101. It's quite accuate even with the wimpy sight radius and a 3" would only make it better. If I'm going to buy a 40 ounce plus revolver, it's going to have to be a .44 mag or something, big N frame for hunting. I just can't see getting a .357 that size. I do have a Blackhawk I use for hunting in .357, 6.5" barrel, about 40 ounces. Hate to have to tote that thing IWB all day, LOL! I've killed a couple of deer with it, though, very accurate, strong, powerful gun.