Just walk in the door from rifle range . Hot California day . I sent my rifle back to BBL maker to re-paint it. They bore scoped it and said I have severe throat erosion also some metal to wood contact. They fixed the bedding,but not the erosion. So I loaded 44grs of W-W760 behind 55gr Blitzking and Nosler CT bullets( 3,900+ FPS) also 44grs of H4831SC behind 62gr Berger Match. All loads produced 1/2MOA and this is out of a sporter weight BBL. So just how significant is throat erosion?
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Throat erosion and 1/2" Moa 22-250 AI
- Thread starter Worker
- Start date
K
keithcandler
Guest
Not to worry.......
barrels will shoot long past where they look good. The key is to still be able to touch the lands with the bullet. Once you start jumping the bullet too far, the bullet gets started crooked, especially on VLD or poly tip bullets.
I have restored accuracy on barrels that had seen their better days by going to a regular Spt lead tip bullet or a Sierra Semi point bullet which are un-real accurate.
When your gunsmith starts thinking about setting back a barrel with some wear on it he needs to have a set of pilots that are for that caliber. Most pilots come in a set, so that he can match the "worn" bore dia for a particular pilot that is needed. Using the correct pilot is critical to get a chamber that is not egg shaped or over sized because if the pilot is not properly matched to the bore dia, then the chamber will have the corresponding "slop" or run out in it....bad news.
When shooting so many p. dogs, we shot Hart unturned blanks in 243 AI and 223. As the leade grew .070-.100 we would set the barrel back. In order to determine how much the barrel needed to be "set back", my gunsmith had a piece of welding rod that had the end of a reamer that would facilate the various size of pilots.
barrels will shoot long past where they look good. The key is to still be able to touch the lands with the bullet. Once you start jumping the bullet too far, the bullet gets started crooked, especially on VLD or poly tip bullets.
I have restored accuracy on barrels that had seen their better days by going to a regular Spt lead tip bullet or a Sierra Semi point bullet which are un-real accurate.
When your gunsmith starts thinking about setting back a barrel with some wear on it he needs to have a set of pilots that are for that caliber. Most pilots come in a set, so that he can match the "worn" bore dia for a particular pilot that is needed. Using the correct pilot is critical to get a chamber that is not egg shaped or over sized because if the pilot is not properly matched to the bore dia, then the chamber will have the corresponding "slop" or run out in it....bad news.
When shooting so many p. dogs, we shot Hart unturned blanks in 243 AI and 223. As the leade grew .070-.100 we would set the barrel back. In order to determine how much the barrel needed to be "set back", my gunsmith had a piece of welding rod that had the end of a reamer that would facilate the various size of pilots.
B
beemanbeme
Guest
IMO a bore's worst enemy is a bore scope. Or to put it another way, a smith's best friend is a bore scope.
I shot a 22-250 way past it's prime, on paper and on P dogs. Each year, I would adjust the COL and then, using a Chrony, adjust the powder load. When I finally had it rebarrelled, my load was out of the book of course and the bullet was into maybe half the neck. Needless to say, I was using a flat based bullet. Since I had never shot it any way except single fire, it was not to worry. The last year before the rebarrel, it was still shooting sub MOA (occassional flyers would push the groups out to an inch or a tad more) and I was still winning factory score matches with it.
I shot a 22-250 way past it's prime, on paper and on P dogs. Each year, I would adjust the COL and then, using a Chrony, adjust the powder load. When I finally had it rebarrelled, my load was out of the book of course and the bullet was into maybe half the neck. Needless to say, I was using a flat based bullet. Since I had never shot it any way except single fire, it was not to worry. The last year before the rebarrel, it was still shooting sub MOA (occassional flyers would push the groups out to an inch or a tad more) and I was still winning factory score matches with it.
agreed!!!!
Totally agree. If it shoots, it shoots. Don't look back. I had an old 700 Varmint Special in a 6mm Rem that I had been shooting for +15 years. About 5 years ago I started shooting the 55 Noslers at 3900-4000 fps. I knew it was eating the throat. Problem was it still keep shooting. The bore scope showed serve erosion for almost 2 inches. But it still would shoot it. Even with a 1:9 twist I never knownly had a bullet come apart even at those hyper-rpms.
Shoot it until it doesn't shoot, tiny
IMO a bore's worst enemy is a bore scope. Or to put it another way, a smith's best friend is a bore scope.
Totally agree. If it shoots, it shoots. Don't look back. I had an old 700 Varmint Special in a 6mm Rem that I had been shooting for +15 years. About 5 years ago I started shooting the 55 Noslers at 3900-4000 fps. I knew it was eating the throat. Problem was it still keep shooting. The bore scope showed serve erosion for almost 2 inches. But it still would shoot it. Even with a 1:9 twist I never knownly had a bullet come apart even at those hyper-rpms.
Shoot it until it doesn't shoot, tiny