Author Topic: Bullet jump / rifle lands?  (Read 1093 times)

0 Members and 1 Guest are viewing this topic.

Offline encore58

  • Trade Count: (13)
  • Contributor
  • ***
  • Posts: 290
  • Gender: Male
Bullet jump / rifle lands?
« on: April 01, 2007, 06:43:13 AM »
I found out an interesting thing today about my .460 S&W Katahdin Encore barrel. Surprisingly, the bullet jump before contacting the rifle lands with a 300 grain Hornady XTP bullet is well over an inch. I found this hard to believe. Hopefully, accuracy will not be effected. Now I wonder if all their rifles have this much bullet jump or it has something to do with the .460 S&W round and Katahdin barrel.??? I am not too alarmed do to the fact that this rifle is goung to be used as a woods gun but if it were a long range varmit barrel I would be very concerned.
What is the normal bullet jump or length to contact the rifle lands for a .22-250 barrel or other long range barrels?
Release the hounds!

Offline swampthing

  • Trade Count: (6)
  • A Real Regular
  • ****
  • Posts: 517
Re: Bullet jump / rifle lands?
« Reply #1 on: April 01, 2007, 11:58:02 AM »
Yes it is "normal." The throat/freebore in most T/C barrels are very long. I can load a 280g bullet to the 1'st lube groove and it will still chamber. That barrel, .44mag, will shoot one ragged hole, same goes for my G2.
 Keeps pressure's low with sammi length ammo.

Offline Lone Star

  • Reformed Gunwriter
  • Trade Count: (0)
  • Senior Member
  • *****
  • Posts: 2359
  • Gender: Male
Re: Bullet jump / rifle lands?
« Reply #2 on: April 01, 2007, 03:24:43 PM »
Im surprised that one inch is 'normal' - none of my T/C barrels come close to that.  It may be because the .460 was specifically designed for the longer cylinder throat and forcing cone of the revolver.  A shorter throat in a solid barrel could have resulted in what T/C considered excessive pressures for their Encore - who knows.  The .460S&W is loaded to near 60,000 psi afterall....

.

Offline grodon of the north

  • Trade Count: (0)
  • Member
  • *
  • Posts: 57
Re: Bullet jump / rifle lands?
« Reply #3 on: April 03, 2007, 07:35:24 PM »
Yep, I could set a 275gn Barnes XPB in the case backwards, stick it in the chamber and it still wouldn't touch the lands ???
Hurrah fer mountain doin's- :D

Offline encore58

  • Trade Count: (13)
  • Contributor
  • ***
  • Posts: 290
  • Gender: Male
Re: Bullet jump / rifle lands?
« Reply #4 on: April 07, 2007, 05:29:53 AM »
I recalculated the bullet jump a little more scientifically and came up with approximately .8 inch of bullet jump. That is a little better than exceeding one inch but still seems a little excessive. I sent the barrel back to T/C for another issue with rear sight running out of elevation and striking 6 inches low at approximately 50 yards. As always, T/C customer service is top notch and they are going to replace the front sight or replace the barrel. The bullet jump does not bother me if the gun shoots accurately. I hit the one inch piece of tape every shot so I think the barrel is going to be a good one once the correct sight are installed. I really like the peep sight and plan to keep it configured without a scope. More a of deep woods gun.
Release the hounds!

Offline Lone Star

  • Reformed Gunwriter
  • Trade Count: (0)
  • Senior Member
  • *****
  • Posts: 2359
  • Gender: Male
Re: Bullet jump / rifle lands?
« Reply #5 on: April 07, 2007, 06:31:04 AM »
Correctly done a long freebore does not compromise accuracy.  SSK has a lot of freebore on their proprietary chamberings, and their product is always noted for top accuracy.

.

Offline encore58

  • Trade Count: (13)
  • Contributor
  • ***
  • Posts: 290
  • Gender: Male
Re: Bullet jump / rifle lands?
« Reply #6 on: April 07, 2007, 07:19:30 AM »
Correctly done a long freebore does not compromise accuracy.  SSK has a lot of freebore on their proprietary chamberings, and their product is always noted for top accuracy.

.

I checked my 15 inch Encore .44 mag barrel out and has closer to one inch of free-bore so I guess this is a standard T/C practice to free-bore their pistol rounds considerably. I would be curious to know what they free-bore their 22-250 or 223 rifle barrels????? Anyone?
Release the hounds!