in a Dasher. Expansion and penetration characteristics are more important than the mere numbers representing bullet weight, velocity, or caliber. Here is the data for 2 bbls, 3 bullet weights, 22-250, Titegroup.. So similar, yet so very different. Changing bullet weight while maintaining the same velocity is probably the most consistent way to raise or lower the point of impact, particularly if the powder charge can be … Bullet weight can be high (200-300 grains) yet kills may be faster than our stout .30 caliber 180 grain bullet example from earlier. Example: 100 grain bullet at 3000 ft/seconds > 100 x 3000 x Measuring gas pressure proved as difficult at first as measuring bullet velocity. If you want to lower your ES Sort your cases With bullet speed or H20 capacity. As further study, I'd like to see the relationship between powder weight, velocity, pressure, AND accuracy. I would love to see a TTAG post by a physicist who can really explain the two concepts and how they relate to our decisions on bullet weights and caliber choices, and how those variables affect things like recoil, penetration, large … Better yet do both. The total case weight the same but the internal H20 capacity is one full GR different And 12 Fps.. Momentum is mass times velocity. .243 Winchester barrels, on the other hand, were rifled 1:10" to stabilize bullets as heavy as 105 grains. Muzzle Energy in pound feet. Larry A bullet weight of 185 gr @ 811 fps has a PF of about 150,000 and ME of 270 lb/ft A bullet weight of 200 gr @ 750 fps has a PF of about 150,000 and ME of 250 lb/ft This calculator will display the foot pounds of energy, and help you compare the power of different loads. Just enter your bullet weight below and its velocity. * Multiply the bullet weight in grains by the velocity at impact. The 1 in 12 inch twist is ideal for best accuracy with varmint weight bullets (70-85 grains) in a high velocity .24 (6mm) caliber rifle. The fourth factor is bullet diameter and put simply, the wider the caliber, the less need there is for high velocity to initiate shock. Kinetic energy varies directly with mass times velocity squared. Many shooters are not aware of the dramatic effects that bullet seating depth can have on the pressure and velocity generated by a rifle cartridge. Accuracy and bullet preference vary slightly in each firearm, but most agree heavy bullets require a faster rate of twist to remain stable in flight. Try to find ballistics gelatin tests or real world reports of a specific load’s performance rather than relying too much on bullet weight as a sole indicator of it’s efficacy. Used as a simply measure or bar to be set in certain shooting sports. Effects Of Cartridge Over All Length (COAL) And Cartridge Base To Ogive (CBTO) – Part 1 by Bryan Litz for Berger Bullets. Cartridge Overall Length (COAL) is also a variable that can be used to fine-tune accuracy. Then, in the mid-1800s, Alfred Nobel and an American named Rodman came up with solutions to that problem at the same time. Rodman’s, the crusher system, is still in use. Weight of bullet (in grains) x velocity (in foot seconds) x velocity x 0.000002218 = energy in foot pounds. Weight is mass accelerated in a gravitational field, in the US this is pounds. .02 in H20 capacity is the same as .01 of powder in bullet speed. Bullet and powder weights are given in grains with 7000 grains to the pound. The acceleration due to gravity is about 32.17 feet per second per second (ft/22). It’s a time-proven statement, although a study conducted by the U.S. Army in early 1986 indicates the sage advice may cite the wrong projectile spec. 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