I found a green mountain 30 cal barrel blank and I was thinking about fitting it to my impact I'll probably just thread both ends
Green mountain barrel blank
- Thread starter Airgunmann
- Start date
How thick should I make it I was thinking about removing the o-rings in the receiver and making it a tight fit with out the o-ring I have a barrel clamp to so how thick should I leave it after the barrel holder ?
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Green Mountain barrels seem pretty good for the money. I bought one and hand lapped it and the interior finish was very good. I absolutely love Benchmark barrels out of Washington. More expensive but every benchmark barrel I have ever bought was fantastic. Good luck friend
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Throat the barrel?
I'm unfamiliar with this.
Is it something I may know by a different name?
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I come from a background of firearms and am relatively new to airguns. I have been thinking of getting a blank and turning it down now that I have access to a lathe. The throat on a firearms barrel is a portion where the rifling is bored out so the bullet can be seated in the barrel without excess pressure. When the powder charge goes off the bullet is pushed into the tighter rifled portion of the barrel that is generally at or slightly below bullet size.
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This generally helps to prevent a pressure spike when the powder goes off allowing a more gradual build of pressure.
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No problem. If you're looking for guidance, here are a couple of related threads
www.airgunnation.com www.airgunnation.com
Selecting reamer size
Could someone explain me the process of selecting the reamer size for a barrel...my .223 shoot not so great n I imagine that the reamed opening is a few thousand big n the jump slightly deforms the bullet..the guy that did the barrel didn't use a reamer..the barrel is long so it could be cut...
www.airgunnation.com Finishing A New Barrel Blank ?
I'd like to try my hand at finishing a new barrel blank. I understand concentricity, crowning and threading. Could some of you with hands on experience talk about the pellet chamber and lead in? I learn fast so share all you're willing. Do you leave freebore or try to start the projectile...
www.airgunnation.com Upvote 0
Thanks @nervoustrig & @fx guy.
The clarification helps.
Especially when one only knows just enough to get in trouble.
Ed
PS
The knowledge I have about the leade all comes from @nervoustrig's tutorials on dressing leades & crowns.
The clarification helps.
Especially when one only knows just enough to get in trouble.
Ed
PS
The knowledge I have about the leade all comes from @nervoustrig's tutorials on dressing leades & crowns.
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It's a leade on a PB too, just past the Freebore. I didn't know we used that term on airguns though thanks for today's lesson.
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I've found in certain other guns there wasn't a leade but if I thread it for transfer port fx style that acts as the leader
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It would have to have some sort of leade or ramp for the pellet or lead would be shaved off of each pellet as it engaged the rifling.
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Is this barrel technically a .308 barrel
Twist rate likely pretty fast requiring longer & thus heavier projectiles ?
Just asking .. not a statement
Twist rate likely pretty fast requiring longer & thus heavier projectiles ?
Just asking .. not a statement
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Technically yes and yes a faster twist it wasn't super expensive so if doesn't work out that's ok
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Turning down a barrels full length OD is definitely not rudimentary. Especially if you’re going to try for a perfect slip fit where it passes through the blocks. Go undersize and just use a front clamp. Depending on what you plan to shoot, you will probably spend a bunch of time juggling the leade depth and a projectile you hope will work. Make your barrel a little longer than you want because once metal is gone, you can’t put it back. Time to start over.
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Cutting lead in airgun pretty easy. PTG throating reamer I'd go with the pilot. You can rent if you don't want to buy. I wouldn't worry about that 12 twist at under 1000 fps I doubt the slug will be stressed. I would hand lap that green mountain barrel or fire lap it at least. It really helps.on soft lead slugs and pellets. Green Mountain barrels are about the same as ER Shaw ,Douglas, barrels. I really prefer hand lapped barrels
.Spoiled good luck I'm sure you'll have a shooter
.Spoiled good luck I'm sure you'll have a shooterUpvote 0