Author Topic: JHP vs Hard Cast  (Read 507 times)

0 Members and 2 Guests are viewing this topic.

Offline hylander

  • Trade Count: (2)
  • Contributor
  • ***
  • Posts: 360
  • Gender: Male
JHP vs Hard Cast
« on: August 21, 2004, 12:18:13 PM »
O.K. here goes:(at the risk of looking stupid)
.44 Mag. as example
I am under the understanding that a Cast bullet needs to
fill the Cylinder of the revolver say .430 bullet in a .430 Cylinder, to be of best accuracy.
So why does a JHP not have to be the same.
Most JHP are .429 coming out of Cylinders .431
Failure is not an option
Placer County, Calif.

Offline dakotashooter2

  • Trade Count: (2)
  • A Real Regular
  • ****
  • Posts: 952
JHP vs Hard Cast
« Reply #1 on: August 21, 2004, 03:42:36 PM »
Pretty simple really. Actually we are dealling with two issues. The cylinder and the bore. You want a lead bullet to be a slip fit in the cylinder and oversized in the bore. You NEVER want a cylinder tighter than the bore as it will swag down the bullet and cause leading. With cast bullets you want a tight fit  to the bore to prevent gasses from getting around the edges of the bullet and melting it, which causes leading. Since jacketed bullets have a harder surface this doesn't happen with them. You also want a deeper "bite" from the rifling in a lead bullet to keep it from stripping at faster speeds. You can get buy with a soft undersized lead bullet better than a hard undersized  bullet at slow speeds because the soft bullet will expand to fill the bore. usually.005 over bore seems to work best.
Just another worthless opinion!!