The Dixie Diarist
Member
Hello All, first post here.
First question: I was doing the math and it seems that (for a .45LC or ACP) a 200gr. cast lead bullet has more muzzle energy than a comparable 230 or 250 gr. cast lead bullet. I was using the formula of muzzle velocity squared x bullet weight in grains / 450411 = muzzle energy in ft-lbs. I calculated this for both Long Colts and ACP's using Lee's reloading data for Titegroup. Is this so, and if so, is there any advantage to a 230 or 250 gr. projectile?
Question Two: Is there any advantage between a truncated cone and an rfnp assuming the meplat is the same? If so, to which does what advantage go? (If it matters I have a SigSauer P220R and a Uberti SAA w/ a 4-5/8" barrel.) I know about the advantages of SWC's, so you don't need to give me that as I am already considering those.
Question Three: as I am still considering using 230 and 250gr. cast lead projectiles, can anyone give me a loadout using Titegroup for either of these weights in .45LC and/or .45 ACP?
Question Four: What is the difference between a Keith and Thompson (?) SWC?
First question: I was doing the math and it seems that (for a .45LC or ACP) a 200gr. cast lead bullet has more muzzle energy than a comparable 230 or 250 gr. cast lead bullet. I was using the formula of muzzle velocity squared x bullet weight in grains / 450411 = muzzle energy in ft-lbs. I calculated this for both Long Colts and ACP's using Lee's reloading data for Titegroup. Is this so, and if so, is there any advantage to a 230 or 250 gr. projectile?
Question Two: Is there any advantage between a truncated cone and an rfnp assuming the meplat is the same? If so, to which does what advantage go? (If it matters I have a SigSauer P220R and a Uberti SAA w/ a 4-5/8" barrel.) I know about the advantages of SWC's, so you don't need to give me that as I am already considering those.
Question Three: as I am still considering using 230 and 250gr. cast lead projectiles, can anyone give me a loadout using Titegroup for either of these weights in .45LC and/or .45 ACP?
Question Four: What is the difference between a Keith and Thompson (?) SWC?