You're right, but I was just noting that the twist is too fast especially for the lighter bullets. I shoot the 133 and 135's and found 7.5 worked better than 7.An overly quick twist will -prevent- keyholing, not cause it.
You're right, but I was just noting that the twist is too fast especially for the lighter bullets. I shoot the 133 and 135's and found 7.5 worked better than 7.An overly quick twist will -prevent- keyholing, not cause it.
Following a good look with a bore scope, step #1 is to verify the twist.25 creedmoor 1 in 7 twist. 26 inch. A round 30 shots , all keyholed. 133 berger , 117 sst,and 117 round nose bullets. All keyholing. Brass looks normal
But the crowd looks rough. I'm no machinist. And it's a McGowen barrel. Any suggestion?
A bullet starting to come apart because of a really rough throat can or barrel definitely keyhole. I’ve seen 150SMK’s make perfect sideways silhouettes at 100 then turn into grey puffs a little farther out. I also had a brand new Rem 700 in 17 Rem that had a barrel as rough as a sewer pipe from the factory that as soon as it copper fouled in about 10 shots would key hole.None of those other things will make a bullet hit the target sideways. It's the wrong twist.
Yep. Looks like we’re more concerned than the OPAs the OP just joined, this was the first post and hasn't logged on since 2 minutes after making this post I'd question his motives. Trying to shoot Subs?
Me too.I'd question his motives
Baffle strike?As the OP just joined, this was the first post and hasn't logged on since 2 minutes after making this post I'd question his motives. Trying to shoot Subs?
I've shot a 22 in a 6MM barrel. Bullets don't make it 50 yds. down range.By process of elimination, he may have a 6.5 creedmoor barrel on the gun, that is not engraving the bullets. The website lists a Creedmoor in both barrel diameters.
A post above says that one of his trial bullets doesn’t need a fast twist to stabilize, but even it keyholes. I am presuming that a 25 creedmoor will chamber up in a 6.5 creedmoor.
Yeah, the velocity would have to be super slow because pressure would also have to be super low. That and zero rpm’s it would be pure luck to hit the target with any shots. It’s possible I guess but like others have said, need more information.I've shot a 22 in a 6MM barrel. Bullets don't make it 50 yds. down range.
Chamber has same dimension to body/shoulder junction so ir will chamber.By process of elimination, he may have a 6.5 creedmoor barrel on the gun, that is not engraving the bullets. The website lists a Creedmoor in both barrel diameters.
A post above says that one of his trial bullets doesn’t need a fast twist to stabilize, but even it keyholes. I am presuming that a 25 creedmoor will chamber up in a 6.5 creedmoor.
Yup…..maybe he expected a quick answer, waited the two minutes and went somewhere else…….like SnipersHide.As the OP just joined, this was the first post and hasn't logged on since 2 minutes after making this post I'd question his motives. Trying to shoot Subs?
Not necessarily. Quality of the bullets/loaded ammo plays a big part. I've seen fast twist barrels key hole bullets. It was a bullet/ammo issue.An overly quick twist will -prevent- keyholing, not cause it.
I once saw a removed barrel that a gunsmith buddy showed me. His customer came to him to see if he could "fix" his keyholing rifle. Looking into the barrel from the breech end, the chamber had been cut so crooked, and misaligned with the bore, I'm amazed the thing even coughed the bullet out. Looked like someone reamed the barrel using a hand drill and no pilot. A quick borescope peek can tell a lot.A bullet starting to come apart because of a really rough throat can or barrel definitely keyhole. I’ve seen 150SMK’s make perfect sideways silhouettes at 100 then turn into grey puffs a little farther out. I also had a brand new Rem 700 in 17 Rem that had a barrel as rough as a sewer pipe from the factory that as soon as it copper fouled in about 10 shots would key hole.
Tried a 6.5 round and it wouldn't chamber. Going to check the twist next.Maybe its a 6.5 barrel.
All done by McGowenMcGowen blank, chamber cut by a gunsmith or a McGowen cut chamber? Call the seller get your money back.
Frank
You still might have a 6 Creedmoor. Or no telling what.Tried a 6.5 round and it wouldn't chamber. Going to check the twist next.