T style
- Thread starter REMY
- Start date
Mike Bryant
Active member
Remy, I didn't realize what a T style barrel was until I looked it up on Bartlein's web site. I was told that Tony Boyer was shooting a 15 to 14 1/4 at the NBRSA Nationals. Needless to say since his name was at the top of the list, they shot very well. Can't help you on the hunter class barrels, but it would be interesting to see what a 18 transitioning to a 17 twist barrel would do.
F
Frank Green
Guest
Guys, Yes Tony's barrels where all 15 to 14.25 twist on all of his guns. There are some .30 cal. barrels on order for customers in different twist ranges from say 18.5 to 17.75, 19 to 18, and I know of a few others.
As more people get to shoot these style of barrel we will accumulate more data.
Lou Murdica has got three of them. He got his two LV before Tony got his. All of Lou's barrels went from a 14 to 13.25. Even though he didn't do super at Phoenix, the first match he shot them in he won and then a week later he got his rail gun barrel going.
In his tunnel he shot over a 100 rounds and bullets from 5 different bullet makers and both flat base and boattails. I asked him what his groups where averaging. He said the worst group was a .120. He took that barrel to an unlimited match the next weekend and agg. a .159 at 200 yards with it.
Are these style of barrels better. To early to tell but it isn't hurting anyone.
Later, Frank
Bartlein Barrels
As more people get to shoot these style of barrel we will accumulate more data.
Lou Murdica has got three of them. He got his two LV before Tony got his. All of Lou's barrels went from a 14 to 13.25. Even though he didn't do super at Phoenix, the first match he shot them in he won and then a week later he got his rail gun barrel going.
In his tunnel he shot over a 100 rounds and bullets from 5 different bullet makers and both flat base and boattails. I asked him what his groups where averaging. He said the worst group was a .120. He took that barrel to an unlimited match the next weekend and agg. a .159 at 200 yards with it.
Are these style of barrels better. To early to tell but it isn't hurting anyone.
Later, Frank
Bartlein Barrels
brian roberts
New member
Uhhhh.....
Nothing???
Nothing???
F
Frank Green
Guest
Gain twist barrels of years back etc....might not have had a uniform gain in the twist from breech to muzzle.
We can do it a couple different ways.
1.) We can have the twist increase uniformly breech to muzzle over the whole length of the barrel.
or
2.) As an extreme example we could start the twist at 1-20 at the breech and physically type in what the twist is suppose to be at any given dimension over the length of the barrel and have it end at what every you want. Say at a 1-13. In this case the twist does not gain uniformly over the length of the barrel.
Some 20mm cannon barrels as an example on a 55" long barrel. The first 20" the twist will increase very slowly, then for the next 20" the twist will increase very dramatically and then the last 15" the twist is still increases but goes back to doing it slowly. The number are approx. but this is a standard for some of the U.S. 20mm barrels and have to be made to a certain spec.
So not all gain twist barrels are necessarily made the same way. That's why we are calling it "T" style rifling for transitional. We can do what ever the customer wants for the most part. Tooling and time still play a part and can effect the cost of the barrel order.
We can even cut twist that start at zero to say a what ever you want it to end up at. We can have the twist do a uniform amount for x number of inches than increase a certain amount for another given length than have it go uniform for the remainder of the barrel length.
Again is one better than the other or is it even better than a straight twist barrel? We don't have that magic book. We have the capability to do more than most.
Shooters using barrels like this for us it is all new. As we get information that we can share we will do that.
T.B. told us back in 1992 he had a barrel that went from a 15 to 14.25 and it got done by accident it sounds like. He said that was one of the best shooting barrels he ever had and asked us if we could do it. We said yes and the first two he got where the HV and shot one at Kelbly's right before Labor day and won the HV class with it.
Later, Frank
Bartlein Barrels
We can do it a couple different ways.
1.) We can have the twist increase uniformly breech to muzzle over the whole length of the barrel.
or
2.) As an extreme example we could start the twist at 1-20 at the breech and physically type in what the twist is suppose to be at any given dimension over the length of the barrel and have it end at what every you want. Say at a 1-13. In this case the twist does not gain uniformly over the length of the barrel.
Some 20mm cannon barrels as an example on a 55" long barrel. The first 20" the twist will increase very slowly, then for the next 20" the twist will increase very dramatically and then the last 15" the twist is still increases but goes back to doing it slowly. The number are approx. but this is a standard for some of the U.S. 20mm barrels and have to be made to a certain spec.
So not all gain twist barrels are necessarily made the same way. That's why we are calling it "T" style rifling for transitional. We can do what ever the customer wants for the most part. Tooling and time still play a part and can effect the cost of the barrel order.
We can even cut twist that start at zero to say a what ever you want it to end up at. We can have the twist do a uniform amount for x number of inches than increase a certain amount for another given length than have it go uniform for the remainder of the barrel length.
Again is one better than the other or is it even better than a straight twist barrel? We don't have that magic book. We have the capability to do more than most.
Shooters using barrels like this for us it is all new. As we get information that we can share we will do that.
T.B. told us back in 1992 he had a barrel that went from a 15 to 14.25 and it got done by accident it sounds like. He said that was one of the best shooting barrels he ever had and asked us if we could do it. We said yes and the first two he got where the HV and shot one at Kelbly's right before Labor day and won the HV class with it.
Later, Frank
Bartlein Barrels