What bullet jump to expect from a new barrel?
11-16-2006, 05:48 AM
#11
Dominant Buck
Join Date: Feb 2005
Location: WC FL
Posts: 26,323
RE: What bullet jump to expect from a new barrel?
ORIGINAL: BTM
I got out the Stoney Point gauge, and it shows 0.15" of bullet jump.
I got out the Stoney Point gauge, and it shows 0.15" of bullet jump.
11-16-2006, 04:42 PM
#13
Guest
Posts: n/a
RE: What bullet jump to expect from a new barrel?
ORIGINAL: BTM
I just had a 'smith rebarrel my 22-250 with a Lilja heavy barrel. Even after careful break-in, it shot terribly (2" at 100 yds). I got out the Stoney Point gauge, and it shows 0.15" of bullet jump. My understanding is that 0.02-0.04" is more the norm, but the 'smith said there's nothing he can do for me.
I've already checked the usual suspects (free floated barrel, scope screws, ammo, etc.), and I think the culprit is excessively long bullet jump. For this I paid $700???
I returned the rifle to him tonight. He said he'd "look at it," but I didn't leave his shop with much of a warm and fuzzy feeling.
Am I getting hosed?
I just had a 'smith rebarrel my 22-250 with a Lilja heavy barrel. Even after careful break-in, it shot terribly (2" at 100 yds). I got out the Stoney Point gauge, and it shows 0.15" of bullet jump. My understanding is that 0.02-0.04" is more the norm, but the 'smith said there's nothing he can do for me.
I've already checked the usual suspects (free floated barrel, scope screws, ammo, etc.), and I think the culprit is excessively long bullet jump. For this I paid $700???
I returned the rifle to him tonight. He said he'd "look at it," but I didn't leave his shop with much of a warm and fuzzy feeling.
Am I getting hosed?
Thats why when I have a gun rebarreled, I specify the freebore wanted with a certain type of bullet. My gunsmith can customize it with a two stage ream to my specifications.If he used a off the shelf clymer reamer, and you are using factory ammo, you might have to change ammo to find one without all the jump. There is no telling what off the shelf factory reamers are cutting.
I had a 300RUM rebarreled. Max COL I could load was 3.65", and my freebore was so long, you had to load out to 3.85" to hit the rifling. I was upset, but with a magnum like that, I found out, you really need some freebore, maybe not that much. But it still shot subMOA easily.
11-16-2006, 07:14 PM
#14
Fork Horn
Thread Starter
Join Date: Feb 2003
Location: Altadena CA
Posts: 494
RE: What bullet jump to expect from a new barrel?
Barrel twist is 1:14".
Factory loads are 55 grain Winchesters.
Reloads are 55 grain Ballistic Tips in front of 37 grains of Varget; this load always shot great in the previous pipe. This is what I based the 0.15" measurement on. (The factory rounds had even more jump.)
As far as the terms "freebore" or "bullet jump", I'm a little unclear on them myself. I used bullet jump based on the diagram in the Stoney Point gauge. Here's what I did: Using the SP gauge, I measured the distance to where the bullet just touched the rifling, then subtracted the length of my cartridge. This yielded the 0.15".
I don't remember what the jump was on my previous barrel, but I know it was a LOT less than 0.15". As mentioned earlier, my reloads are already a little long; any further lengthening would put the bullets too high in the neck, plus the rounds would no longer fit in the magazine.
I appreciate your feedback, gentlemen. Please keep 'em coming!
Factory loads are 55 grain Winchesters.
Reloads are 55 grain Ballistic Tips in front of 37 grains of Varget; this load always shot great in the previous pipe. This is what I based the 0.15" measurement on. (The factory rounds had even more jump.)
As far as the terms "freebore" or "bullet jump", I'm a little unclear on them myself. I used bullet jump based on the diagram in the Stoney Point gauge. Here's what I did: Using the SP gauge, I measured the distance to where the bullet just touched the rifling, then subtracted the length of my cartridge. This yielded the 0.15".
I don't remember what the jump was on my previous barrel, but I know it was a LOT less than 0.15". As mentioned earlier, my reloads are already a little long; any further lengthening would put the bullets too high in the neck, plus the rounds would no longer fit in the magazine.
I appreciate your feedback, gentlemen. Please keep 'em coming!
11-17-2006, 07:36 AM
#16
Giant Nontypical
Join Date: Feb 2003
Location: Texas - BUT NOW in Madison County, NY
Posts: 6,270
RE: What bullet jump to expect from a new barrel?
ORIGINAL: BTM
I just had a 'smith rebarrel my 22-250 with a Lilja heavy barrel. Even after careful break-in, it shot terribly (2" at 100 yds). I got out the Stoney Point gauge, and it shows 0.15" of bullet jump. My understanding is that 0.02-0.04" is more the norm, but the 'smith said there's nothing he can do for me.
I've already checked the usual suspects (free floated barrel, scope screws, ammo, etc.), and I think the culprit is excessively long bullet jump. For this I paid $700???
I returned the rifle to him tonight. He said he'd "look at it," but I didn't leave his shop with much of a warm and fuzzy feeling.
Am I getting hosed?
I just had a 'smith rebarrel my 22-250 with a Lilja heavy barrel. Even after careful break-in, it shot terribly (2" at 100 yds). I got out the Stoney Point gauge, and it shows 0.15" of bullet jump. My understanding is that 0.02-0.04" is more the norm, but the 'smith said there's nothing he can do for me.
I've already checked the usual suspects (free floated barrel, scope screws, ammo, etc.), and I think the culprit is excessively long bullet jump. For this I paid $700???
I returned the rifle to him tonight. He said he'd "look at it," but I didn't leave his shop with much of a warm and fuzzy feeling.
Am I getting hosed?
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