weight the same, power loads different.

irvb · April 10, 2005, 10:49 PM

if you have a 230 grain bullet 1 lead, one jacketed ,why does it take more power to expel the jacketed bullet over the lead bullet according to the powder manufacturer's specifications?

rwilson452 · April 10, 2005, 11:00 PM

copper is harder thus it resist being transformed to match the grooves and barrel diameter. It takes more energy to push it down the barrel. with the same powder charge it will develop more pressure due to this effect and be slower comming out.

mtnboomer · April 11, 2005, 01:23 AM

It's all about FRICTION! Lead bullets are softer than copper, regardless of how hard you cast them - even straight linotype. The softer the projectile, the less friction it produces because it shapes itself to the bore and rifling faster which creates less heat which creates less friction. Although jacketed bullets can be pushed to higher speeds - at higher pressures - due to the protection of the harder copper coating, cast bullets can be launched at near magnum speeds using a crimped on metal base cap and still create lower pressure.

April 10, 2005, 10:49 PM	#1
irvb Junior Member Join Date: March 2, 2005 Posts: 3	weight the same, power loads different. if you have a 230 grain bullet 1 lead, one jacketed ,why does it take more power to expel the jacketed bullet over the lead bullet according to the powder manufacturer's specifications?

April 10, 2005, 11:00 PM	#2
rwilson452 Senior Member Join Date: June 10, 2004 Location: Tioga co. PA Posts: 2,647	lead vs copper copper is harder thus it resist being transformed to match the grooves and barrel diameter. It takes more energy to push it down the barrel. with the same powder charge it will develop more pressure due to this effect and be slower comming out.

April 11, 2005, 01:23 AM	#3
mtnboomer Senior Member Join Date: July 9, 2004 Location: Oklahoma by birth. America by the grace of God. Posts: 635	It's all about FRICTION! Lead bullets are softer than copper, regardless of how hard you cast them - even straight linotype. The softer the projectile, the less friction it produces because it shapes itself to the bore and rifling faster which creates less heat which creates less friction. Although jacketed bullets can be pushed to higher speeds - at higher pressures - due to the protection of the harder copper coating, cast bullets can be launched at near magnum speeds using a crimped on metal base cap and still create lower pressure. __________________ Quando Omni Flunkus Moritati (If all else fails - play dead!) Support the Second Amendment. Join the NRA > http://www.nra.org < Oklahoma State & Big 12 - #1 GO POKES!!!!!