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Re: 6.5 Barrel 1-8 or 1-8.5?
1/8.5 will be a touch more forgiving when shooting 120/123gr bullets, but not tha much differace. If your going to be shooting only 142/140gr bullets, go with the 1/8.
1/8.5 will be a touch more forgiving when shooting 120/123gr bullets, but not tha much differace. If your going to be shooting only 142/140gr bullets, go with the 1/8.
Re: 6.5 Barrel 1-8 or 1-8.5?
I have not heard of an 8.5 twist for the 140's.
Tubb runs a 1 in 8. The DPMS are built with 1 in 7.5.
The Team Blaster guys are running, I think, 1 in 8.
Perhaps more importantly, the cartridge was designed for a barrel with .257 land and .264 groove diameters.
I am not a believer of having problems overspinning by 1/2 twist: a bit faster rarely does any harm. But not stabilizing a bullet in cold weather would be a concern.
I have not heard of an 8.5 twist for the 140's.
Tubb runs a 1 in 8. The DPMS are built with 1 in 7.5.
The Team Blaster guys are running, I think, 1 in 8.
Perhaps more importantly, the cartridge was designed for a barrel with .257 land and .264 groove diameters.
I am not a believer of having problems overspinning by 1/2 twist: a bit faster rarely does any harm. But not stabilizing a bullet in cold weather would be a concern.
Re: 6.5 Barrel 1-8 or 1-8.5?
Thanks guys,
I found a Krieger, 1-8 twist, medium palma that could finish at 31", but I think I'll lop it off at 27".
Would their be enough at the breech to do a set back later for a hunting length barrel and then have a second barrel on reserve for match play?
Thanks guys,
I found a Krieger, 1-8 twist, medium palma that could finish at 31", but I think I'll lop it off at 27".
Would their be enough at the breech to do a set back later for a hunting length barrel and then have a second barrel on reserve for match play?
Re: 6.5 Barrel 1-8 or 1-8.5?
We are running 28" barrels. 27" will give you good velocity too if you wanted to go that length but we find no problems swinging the 28" barrels around at matches.
As to the twist, when we were talking to Hornady about the build they recommended the 8 twist and that is why we went with them. No use doubting the people who made the round. We are also running Kreigers and they are very accurate. You will like the barrel.
We are running 28" barrels. 27" will give you good velocity too if you wanted to go that length but we find no problems swinging the 28" barrels around at matches.
As to the twist, when we were talking to Hornady about the build they recommended the 8 twist and that is why we went with them. No use doubting the people who made the round. We are also running Kreigers and they are very accurate. You will like the barrel.
Re: 6.5 Barrel 1-8 or 1-8.5?
Been running a 1-8.5 twist Obermeyer chambered in 6.5x55 with the 139-142gr bullets for several years now. Works just fine.
Don
Been running a 1-8.5 twist Obermeyer chambered in 6.5x55 with the 139-142gr bullets for several years now. Works just fine.
Don
Re: 6.5 Barrel 1-8 or 1-8.5?
While we're at it are there any specific needs or criteria for the chamber, as far as throat/leade to chase throats as they advance (which for me will be another 5 years for no more than I get to shoot lately)? Guess Mr. Kiff has that already factored into the equation with the reamer?
Really appreciate all your insight and help. Best experiance is usually someone elses!
While we're at it are there any specific needs or criteria for the chamber, as far as throat/leade to chase throats as they advance (which for me will be another 5 years for no more than I get to shoot lately)? Guess Mr. Kiff has that already factored into the equation with the reamer?
Really appreciate all your insight and help. Best experiance is usually someone elses!
Re: 6.5 Barrel 1-8 or 1-8.5?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Graham</div><div class="ubbcode-body">
I am not a believer of having problems overspinning by 1/2 twist: a bit faster rarely does any harm. </div></div>
I agree from running various .30 slugs in a 1:10. The first 1:10 worked great so stuck with it, another 1:10 4" longer worked better. BC was much accounted for from 1:12 to 1:10.
I have not shot short 'n light in a .260 to compare. Went with 1:8. The end result is MV dependant, if your running a shorter barrel or lighter loads to save the throat, you may want to lean towards the faster twist. I load all with what works best. As stated previously, I'm sure either would work.
I would guess that bearing surface per bullet diameter comes into play. Yet, chamfered and radius lands are popular and work. If your leaving less foul, I think either your imparting less twist or rotational velocity is achieved later down the barrel. Nittle published data on actual imparted twist per bullet across different cal/loads/land cut with that subject. I've read some Palma voodoo on minimum imparted twist but never witnessed anything personally to support it and they are velocity driven with relatively long tube so twist should also be relatively minimum. That's a one trick pony.
In the end: If your loading long and fast for distance, I guess that there are other greater factors. It's much forgiving within a rotation while retaining supersonic velocity. Do what works for everyone else and they are doing either.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Graham</div><div class="ubbcode-body">
I am not a believer of having problems overspinning by 1/2 twist: a bit faster rarely does any harm. </div></div>
I agree from running various .30 slugs in a 1:10. The first 1:10 worked great so stuck with it, another 1:10 4" longer worked better. BC was much accounted for from 1:12 to 1:10.
I have not shot short 'n light in a .260 to compare. Went with 1:8. The end result is MV dependant, if your running a shorter barrel or lighter loads to save the throat, you may want to lean towards the faster twist. I load all with what works best. As stated previously, I'm sure either would work.
I would guess that bearing surface per bullet diameter comes into play. Yet, chamfered and radius lands are popular and work. If your leaving less foul, I think either your imparting less twist or rotational velocity is achieved later down the barrel. Nittle published data on actual imparted twist per bullet across different cal/loads/land cut with that subject. I've read some Palma voodoo on minimum imparted twist but never witnessed anything personally to support it and they are velocity driven with relatively long tube so twist should also be relatively minimum. That's a one trick pony.
In the end: If your loading long and fast for distance, I guess that there are other greater factors. It's much forgiving within a rotation while retaining supersonic velocity. Do what works for everyone else and they are doing either.
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