What bartlein Barrel Length for 6Dasher

[shootnjunky]

I decided to change and will be having a 6dasher chambered up.

Question on whether the 26" barrel that is spec'd will be good for 3000+ or should I go to 28 or 30?

I will be using for 1k F-Class shooting only.

Thanks

 

[LRPV]

28" is pretty common. Might be worth going 30 to start then you still have 28" after a set back and if it's a good one set it back again for 26"

 

[Killshot]

Standard 31" blank, after cut offs for muzzle and chambering, should leave 29"-30" length to the boltface.

No reason at all not to get the longest.

 

[AckleymanII]

Go 31", trim back to 30"!!!

Keith

 

[bsumoba]

To add to the conversation, is there a point where there might not be any benefit in going longer on the barrel and could there ever be a point where the extra length actually hurts velocity, because in the "X" amount of inches of the barrel, it is technically reached max velocity and the added length could actually "slow" down the bullet?

Just thinking out loud...

 

[shootnjunky]

To add to the conversation, is there a point where there might not be any benefit in going longer on the barrel and could there ever be a point where the extra length actually hurts velocity, because in the "X" amount of inches of the barrel, it is technically reached max velocity and the added length could actually "slow" down the bullet?

Just thinking out loud...

i agree with this line of questioning ;D

 

[Judd]

I've never seen that situation occur.

Now, with F-class you have a weight limit so that should play into your thinking of length of barrel.

I don't deal with weight limits and I've read to much about setting back not being worth the time/money to do so I shoot them at 28" and when it's done, it's done. Barrels are the closest disposible items next to bullets/primers/powder/brass that we have.

When I first got into this sport a guy smarter than me said....don't worry about the barrel, they make'em while we're sleeping. I sort of take that approach and have a few extras laying around ready to chamber when needed.

Good luck.

 

[savagedasher]

My next will finish at 34'' . It should shoot 80' Faster with the same pressures. Larry

 

[CaptainMal]

FYI...

My 30" Bartlein shoots 10 - 12 fps faster with the SAME load than my 28" Krieger. I mean same case, primer, bullet, powder, seating depth etc.

Now the Bartlein is 7 1/2 twist and the Krieger is an 8" twist. Both are Dashers.

 

[shootnjunky]

Now, with F-class you have a weight limit so that should play into your thinking of length of barrel.

My current 6br rig only weighs 14.8# so I have another 6# or so before i have to worry

 

[shootnjunky]

FYI...

My 30" Bartlein shoots 10 - 12 fps faster with the SAME load than my 28" Krieger. I mean same case, primer, bullet, powder, seating depth etc.

Now the Bartlein is 7 1/2 twist and the Krieger is an 8" twist. Both are Dashers.

Fair point. I will be using the 8tw in the bartlein. I found a 31" blank 1.25" straight taper I might go with.

 

[Killshot]

is there a point where there might not be any benefit in going longer on the barrel and could there ever be a point where the extra length actually hurts velocity, because in the "X" amount of inches of the barrel, it is technically reached max velocity and the added length could actually "slow" down the bullet?

Even with the fastest-burning powder I don't think that would occur, even with a much longer barrel. The pressures far exceed any resistance the barrel can impart.

Would be an interesting project though.

 

[Pappy42]

My Dasher has a 28" Bartlien 5R and chronos 3000 fps with Berger 105 VLDs, Varget, Lapua brass, and CCI-450s. Has shot 0s at 100. I've only fired it to 500; so don't have a clue what it does at 1000.

 

[shootnjunky]

My Dasher has a 28" Bartlien 5R and chronos 3000 fps with Berger 105 VLDs, Varget, Lapua brass, and CCI-450s. Has shot 0s at 100. I've only fired it to 500; so don't have a clue what it does at 1000.

How bout you go test it tomorrow ;D ;D ;D ;D ;D

 

[bsumoba]

is there a point where there might not be any benefit in going longer on the barrel and could there ever be a point where the extra length actually hurts velocity, because in the "X" amount of inches of the barrel, it is technically reached max velocity and the added length could actually "slow" down the bullet?

Even with the fastest-burning powder I don't think that would occur, even with a much longer barrel. The pressures far exceed any resistance the barrel can impart.

Would be an interesting project though.

I know a lot of guys go with a 28" barrel in a dasher. I always thought that they go with the length because the velocity increase sort of peaks in a 28" barrel. My dasher barrel has a 30", primarily because I want to be able to set it back later if needed and it is not too long and too short in my opinion....just right

That being said, for guys shooting heavy gun, why wouldn't they just choose a VERY long barrel, having no weight restrictions and assuming that velocity still increases? I still see rather short barrels though.

If some of that powder is still igniting after the bullet leaves the muzzle, then you are losing velocity because that powder that should be used to drive the bullet forward is just making loud noise. On the other extreme, if you go to a very long barrel, say 37" inches for the hell of it, and when the bullet passes the 34" mark in the barrel, all the powder is effectively burned up...doesn't this mean that the last three inches are just added metal and weight and due to friction, may actually be working against you, slowing your bullet down?

So, in conclusion, is the most optimum barrel length (assuming no weight or size or length restrictions) the length that the bullet just leaves the muzzle AND all the powder is fully burned up in the barrel (essentially transferring all of its energy to driving the bullet?

 

[savagedasher]

FYI...

My 30" Bartlein shoots 10 - 12 fps faster with the SAME load than my 28" Krieger. I mean same case, primer, bullet, powder, seating depth etc.

Now the Bartlein is 7 1/2 twist and the Krieger is an 8" twist. Both are Dashers.

I have two Krieger and one Bartlein And one Mc Gowen.
All 4 have 30'' barrels with the exact same load Both the 8 twist are 12 FPS faster then the 7.5 twist
When I had a 28'' it was 30FPS slower them the 30 ''. Larry

 

[johara1]

Started with 30" but found 28" shot better and i have no trouble getting 3030 FPS. with an ES. of 1 and just cut one back to 26" with the same load as the 28" barrel it is a 1/2 min. low at 1000. Do you need 28"or 30"? shorter is stiffer….. less muzzle whip……. jim

 

[jr600yd]

I seem to remember a test done years ago on this subject. If all my brain cells are working I believe the test was done using a 223 caliber rifle. I don't recall the bullet weight or powder charge but loss of velocity to any great degree didn't occur until barrel length exceeded 16 FEET!!!

 

[Terry Altom]

Larry,

Did you notice any difference in accuracy of the 8 twist versus 7.5 twist barrels? Getting ready to order a new barrel for my Dasher.

Thanks,
Terry

FYI...

My 30" Bartlein shoots 10 - 12 fps faster with the SAME load than my 28" Krieger. I mean same case, primer, bullet, powder, seating depth etc.

Now the Bartlein is 7 1/2 twist and the Krieger is an 8" twist. Both are Dashers.

I have two Krieger and one Bartlein And one Mc Gowen.
All 4 have 30'' barrels with the exact same load Both the 8 twist are 12 FPS faster then the 7.5 twist
When I had a 28'' it was 30FPS slower them the 30 ''. Larry

 

[bsumoba]

I seem to remember a test done years ago on this subject. If all my brain cells are working I believe the test was done using a 223 caliber rifle. I don't recall the bullet weight or powder charge but loss of velocity to any great degree didn't occur until barrel length exceeded 16 FEET!!!

So in theory, and maybe in practice, the bullet will keep increasing in velocity as the barrel length increases and the barrel length is most likely VERY long before it works against you?