Currently I prefer 135 grain 1600fps JHP from Underwood for a defensive round. For the range I recently bought some Underwood 155gr Total Metal Jacket 1500fps for no other reason than it's the cheapest box of full power 10mm that I know of. The 135gr recoil is very manageable and this bullet is only 20 grains larger than that so I loaded it up for the first time the other day not expecting much kick and the first shot felt like someone was trying to knock the gun out of my hand with a baseball bat. Maybe it also felt stronger because I wasn't expecting it but still I had to double check the box to be sure I hadn't been sent the wrong ammo. I went home made a list of the specs for each UW round and discovered the 155gr was just as stout on paper as it feels when shooting. gr..... fps .....PF..... ft.lbs. 200 1250 250,000 694 ft. lbs. 180 1300 234,000 676 ft. lbs. 165 1400 231,000 718 ft. lbs. 155 1500 232,000 775 ft. lbs. 135 1600 216,000 767 ft. lbs. In fact it's #1 in muzzle energy, #2 in velocity and comparable in power factor to the 165 and 180 grain. Maybe this is a question for Kevin Underwood but do these numbers suggest the 155 has a high, maybe the highest powder to bullet weight ratio of Underwood's 10mm line? Regardless it seems the 155 might be a good choice for those wanting the highest velocity possible but more penetration than a 135gr could offer (assuming JHP not TMJ for defensive). Particularly because you can get the 155 in a bonded bullet but not the 135. As far as accuracy, at 10 yards I was able to keep almost all shots in the white vital area with slow, deliberate aiming; using one of those ATF targets with no clearly defined bullseye. http://www.letargets.com/images/spp-atf4v2.jpg I don't think I'm skilled enough to rapid fire this round yet unless maybe at 3 yards or so. Gun: glock29sf, KKM barrel, 23lb spring Here is a youtube user who posted a google doc with real world test results from various 10mm. Look at what round is #1. https://docs.google.com/spreadsheet/ccc?key=0AjsXvXEryDJjdFhsRUcwSHRUcktCMmhOMTVFa25xa1E Wanna kill these ads? We can help!