Originally Posted by overbore
I have been up to my antlers in getting new PD equipped and missed your SG question. This is a designator of the relative Stability Value or Factor of a given bullet ( length ) at a specific MV with a specific twist. A bullet with a stability factor of 2.0 is considered by the military to be fully stabilized. A Factor below 1.35 is considered stabilized, bottom end, but higher atmospheric densities may require more twist to stay within the 1.35 SG. In Bench shooting some of the greatest accuracy groups are shot a lower SG numbers, slower twist barrels. These AL tip bullets eliminate the uneven BC's from vertical stringing by having uniform meplats; a very good thing as bullet lengths are now all uniform so vertical uniformity is enhanced. In Nam, the 5.56 bullet was not "fully stabilized" meaning that upon impact in Charley, it would tumb-- le. Deliberate emphasis on what happened to to soft tissues. No expansion but tumbled well. Now the REMF's ( if you don't know what that means you did not serve ) have a stable bullet that will penetrate a helmet at 500Meters but will not give a one stop hit at close range--. It is all in the twist-- Best wishes, Overbore
I shot little torpedoes (some mines) and great big ICBMs from submarines for thirty years............ All of them had minds of their own........ However, none of the small stuff you are referencing.
When I was the submarine force student rep at USASMA (army school) in Ft Bliss during 1997, we had some friendly 600 meter shoots. It was funny because the first few shoots, the SF guys underestimated me and I took their money. When the third shoot was scheduled, a memo was circulated that forbade them to shoot for money anymore against the "Navy"............ We all had a great time during that year.
My faculty advisor (Hank the tank Gallahan) was an SF sniper and after his wife (with my rifle) beat him with his sniper rifle at 600 meters on the first three shots she took with my gun, he packed up his stuff, took off his Rolex and sold it the next day to finance a new action. He is now the proud owner of his own 17-4 pH stainless switch-barrelled rifle. His wife had never shot at anything over 100 yards until she shot the Hall M. I still hear the story third hand from folks who know Hank...... It was hilarious. Too bad candid camera was not there.
But I did serve my "time". Hooooooah!