What bartlein Barrel Length for 6Dasher
- Thread starter shootnjunky
- Start date
Terry at 600yds I cant tell any difference. At 1000 Both of the 7.5 I have done better then the 8taltom said:
The conditions at our range changes from summer to winter Summer like now because of the gulf stream our winds are from behind or southern direction Winter they change to the north direction.. the 7.5 twist had less vertical in both . I will not build another 8 for that reason. The 7.5 shoots at 300 also. Last month my son won the Dirty Bird 300 yd winning both group and score A week later his son won small group single and total.
Two different distance two different shooter and the same results .The gun has a 7.5 twist.. So my answer is yes a 7.5 is better. The 7.5 is 12' slower also. Larry
Just ordered a Bartelin 30" 7.5" twist from Bullets.com
Now on to the stock portion of my new build.
Now on to the stock portion of my new build.
savagedasher said:
taltom said:
Well I ordered the same but in an 8tw, lets keep in touch and see how they both do.
No Brian. As a barrel gets longer velocity will increase up to a point, however there are other things to be considered such as barrel stiffness witch is directly related to barrel diameter and length relative to accuracy potential.
Go to the Lilja custom barrels web site and read about the subject (Barrels). It is very interesting and will explain your original question and give you better insight into what is going on with barrels.
Go to the Lilja custom barrels web site and read about the subject (Barrels). It is very interesting and will explain your original question and give you better insight into what is going on with barrels.
Back in '07 small group record in 600 yard IBS was broken 3 or 4 times with the 28 in length by
Sam Hall, Rodney Wagner, Larry Isenhour, ets. The next year everone went to the 30 in.
Was not very long at all before these guys went back to 28 with the general belief that 28 was the
optimal barrel length.
I tried 30, and went back to 28 and I have even had a 26 in. to make weight in light.
I will not do another 30 in. I like he extra stiffness compared to the extra 15 fps.
Sam Hall, Rodney Wagner, Larry Isenhour, ets. The next year everone went to the 30 in.
Was not very long at all before these guys went back to 28 with the general belief that 28 was the
optimal barrel length.
I tried 30, and went back to 28 and I have even had a 26 in. to make weight in light.
I will not do another 30 in. I like he extra stiffness compared to the extra 15 fps.
I only lost 7 FPS. per inch from 30" to 28" ……. i lost more by going to a 7.5 twist from a 7.83 or a 8 twist. I would never do a 30" again myself. The loss was made up by adding a little more powder to get back in the node. It isn't a race, you can't give up accuracy for speed alone, you gain nothing. If you can get a barrel that puts them asleep it trumps them all in the wind. jim
[quote 
author=shootnjunky link=topic=3882657.msg36630281#msg36630281 date=1441997652]
Well I ordered the same but in an 8tw, lets keep in touch and see how they both do.
[/quote]
Sure no problem. Might be a little while til I get the barrel on my Borden action, but it should be at my smith Tuesday.
author=shootnjunky link=topic=3882657.msg36630281#msg36630281 date=1441997652]taltom said:
Well I ordered the same but in an 8tw, lets keep in touch and see how they both do.
[/quote]
Sure no problem. Might be a little while til I get the barrel on my Borden action, but it should be at my smith Tuesday.
go for 30 inch don't look back
I just dropped off a 31" Bartelin 5R (1.25"x5" straight taper to 1") with my smith. I told him to take one inch from the breach and two inches from the muzzle, leaving me with 28". I've got a little while until it will make it to the front of the line, so I wanted to see if anyone has tangible results/data with a 29" barrel. Seems like it should gain a little speed without giving up too much in the way of stiffness. I see a lot of 30" barrels, but with a .243 bore I don't really see the need for it.
zfastmalibu said:
1" should be more than plenty to cut off and clean up any bell mouthing. You don't need to cut anything off the breech end. Any run out here and the chamber reamer will clean it up. The only time I recommend cutting anything off the breech end is on a .22rf because the RF chamber is so short.
Our's not shooting as good as a Krieger!? That's a new one.
Also we made an ammunition pressure test barrel for one of the powder makers. It was a 30" finish length 1-8 twist and 5R rifling. They've told me it just pounds them even with lighter weight bullets.
If I was putting together a strictly bench gun on a 6 Dasher I would use conventional rifling like a standard 4 groove. If it's a F-Class gun I would use the 5R style rifling. Either barrel would be a .237" bore. I don't run the .236" bore barrels. I feel they are more temperamental at times and also bullet failure is higher in the tighter bore.
I'm redoing a Rem. 40x that was originally a 6BR. New barrel is going to be a 6 Dasher chamber and 4 groove and 1-7.75 twist.
Later, Frank
Bartlein Barrels
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