ARCHIVED
 LA_357SIG
Ol' Ironsights
Team Member
Joined: Jan 2007  TN, USA
 Posts: 4570 Feedback: 100% (14) |
Posted: 3/31/2012 12:00:05 PM
THE IMAGE ABOVE IS A PAID ADVERTISEMENT 
|
|
|
echo_5
unconventional
Team Member
Joined: Feb 2008 CT, USA
Posts: 4526 Feedback: 100% (30) Link To This Post |
Posted: 3/31/2012 12:37:00 PM
I've seen target crowns from 11 to 17 degrees, even under threads.
The flat crown looks unusual, to me anyway. |
|
|
|
Posted: 3/31/2012 12:45:59 PM
[Last Edit: 3/31/2012 12:50:52 PM by NUCdt04]
is it concave at all? I can't tell
my 40xb is nicely concave - my 10/22 was stepped but, after threading the step was gone (I didn't want to recrown- damn accurate barrel as is) so I had the thread protector act as the target crown without the can
  |
|
|
Pain
Thugs don't like me
Team Member
Joined: Jun 2005 CT, USA
 
Posts: 2203 Feedback: 100% (5) Link To This Post |
Posted: 3/31/2012 8:46:52 PM
Yes, the crown looks fine.
The main thing to look at is there are no burrs or knicks around the crown and it's smooth & even. Try different ammo as the barrel is shorter than before. The barrel harmonics are different now. |
|
|
|
Posted: 3/31/2012 8:54:05 PM
Originally Posted By Pain:
Yes, the crown looks fine. The main thing to look at is there are no burrs or knicks around the crown and it's smooth & even. Try different ammo as the barrel is shorter than before. The barrel harmonics are different now. ^This You changed the harmonics, it's got a different vibe. You'll have to test some different ammo to find out what it likes now. Don't worry too much about the crown unless a) it looks like crap and has visable defects with a magnafying glass or b) It won't shoot any ammo worth crap. |
|
|
|
|
Posted: 3/31/2012 10:51:35 PM
Originally Posted By NUCdt04:
is it concave at all? I can't tell my 40xb is nicely concave - my 10/22 was stepped but, after threading the step was gone (I didn't want to recrown- damn accurate barrel as is) so I had the thread protector act as the target crown without the can That thread protector looks good. It protects the muzzle like a recessed target crown. I usually make straight crowns as it is so easy, and hard to screw up. You don't have to dial in the bore for a straight cut, and it looks right for large diameter barrel target rifles. |
|
|
|
Redtazdog
Member
Team Member
Joined: Dec 2002 WA, USA
Posts: 3577 Feedback: 100% (12) Link To This Post |
Posted: 3/31/2012 11:14:08 PM
I have done some testing on harmonics of a barrel by taking a 20" 10-22 barrel and chopping 1/2 inch at a time and shooting for groups
with the same ammo at each length. Started out with 1.25 groups and it got better after I took the first inch off then the groups grew again and after a few more chopps the groups got small again. Done the same test with AR dedicated 22 barrels, 223, 308 and even a couple pistol caliber barrels and they all did the same thing. You could call it finding the wave for your bullet to ride on. This is one of the reasons hand loaded ammo can get some of the best groups possible from a barrel as you they can make a load that rides the smooth part of the wave, with 22 Lr you just need to find what ammo the barrel likes or start chopping the barrel to work with the ammo. For most its easier to find the ammo that the barrel likes 
|
|
|
|
tarfu64
High Drag Low Speed
Team Member
Joined: Jun 2002 NH, USA
Posts: 1202 Feedback: 100% (26) Link To This Post |
Posted: 4/1/2012 8:03:08 AM
Originally Posted By Redtazdog:
I have done some testing on harmonics of a barrel by taking a 20" 10-22 barrel and chopping 1/2 inch at a time and shooting for groups with the same ammo at each length. Started out with 1.25 groups and it got better after I took the first inch off then the groups grew again and after a few more chopps the groups got small again. Done the same test with AR dedicated 22 barrels, 223, 308 and even a couple pistol caliber barrels and they all did the same thing. You could call it finding the wave for your bullet to ride on. This is one of the reasons hand loaded ammo can get some of the best groups possible from a barrel as you they can make a load that rides the smooth part of the wave, with 22 Lr you just need to find what ammo the barrel likes or start chopping the barrel to work with the ammo. For most its easier to find the ammo that the barrel likes
Well done. |
|
ARCHIVED
