#THE MAXIMUM AMOUNT OF FPS FOR A SUBSONIC ROUNDS PLUS#
* All PLUS P loads for guns designed for it (20,000 PSI) 180 grain LEAD (Truncated Cone) Flat Point VV N320 Hi=859 lo=743 ES=116 *(my personal medium load)ġ58-160 grain JHP or JSP (Jacketed Hollow or Soft Point) Bullseye Hi=886, Lo=861, ES=25 (This is a Carolina Cast bullet SWC-great cowboy load)
Hi=758 lo=693 ES=65 (powder up and down)(DO NOT USE LESS) Hi=815 lo=637 ES=178 (powder in normal positions) Load it like Trail Boss 158 grain LSWC or LRN (Semi-Wad, Rnd. * Blackhorn 209 is a black powder substitute with smokeless like qualities. to 4.3 gr.) 146-150 grain JHP (Jacketed Hollow Point) Bullseyeġ58 grain Lead RNFP or SWC COWBOY load Trail Boss Load it like Trail Boss 125 grain JHP or JSP (Jacketed Hollow or Soft Point) Bullseyeġ46-148 grain LWC (Lead Wad Cutter) Bullseye (IMR 4227 is same as H-4227 if made in Australia) 90 grain Lead RNFP Cowboy loads Titegroupġ10 grain JHP (Jacketed Hollow Point) Bullseye It is just a guide and the reason you should start under these charges and work up.
Due to different barrel lengths, type of bullet, seating depth, primer type and other factors, you may not get near the FPS charted. (See note on Powders below or read all about various Powders.)īullets are. less to start.) Only if you see more than one load, is it less than maximum. (Note: These are near maximum loads (in some cases ARE MAXIMUM), you should use 10%. (WC= WadCutter, SWC= Semi-WadCutter, HP= Hollow Point, RN= Round Nose), (JHP= Jacketed Hollow Point and if GC indicated, means Gas Check at bottom of lead bullet) Loads for. When you put a cap on the velocity (speed of sound), have a minimum amount of pressure to get the bullet out of the bore safely, and need the bullet to be effective (it needs to carry its momentum in the mass component, not the velocity component of its ballistics and energy), then the only way to go is heavier.Ī light bullet might be too little powder (weird ignition issues), too little pressure (or a curve not ideal for the barrel, leaving a big fireball), and too ineffective at subsonic velocities, while a heavy bullet would have sufficient powder, pressure (even more important in semi-autos using the pressure to cycle the action, plus a longer dwell time picking up energy), and terminal effect.Left to right:–148 gr. Heavy bullets are slower, but are affected by drag less and are sometimes more effective when they get to their target. Those relationships combined work out such that, for the same kinetic energy, a light bullet is fast, flat shooting, but penetrates less and slows down much faster. In terms of terminal ballistics for the same bullet shape, heavier means better penetration. BC also has a relationship with bullet mass and velocity.
Drag has a linear relationship with mass and an exponential relationship with velocity. Momentum has a linear relationship with velocity and mass. Kinetic energy has a relationship with mass and the square of velocity. A cartridge imparts kinetic energy into the bullet through pressure, and it is a race of the pressure curve to the barrel length for getting the most energy transferred to the bullet before the bullet leaves the barrel. A cartridge converts chemical potential energy (gunpowder) into kinetic energy (motion of the bullet, heat, sound).
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