7mm-08 barrel twist
- Thread starter hawk eye
- Start date
just note that the stability off weight is now incorrect as we have copper , lead and other types of materials available now . its best to look the bullet to be used and look up what the bullet manufacturer recommends in the calibre in question
I’d go faster to future proof - 1:8
K.H - Tikka
Well-Known Member
I had a build spec’d recently for a 7-08; we won’t discuss the outcome but that had a 1:7 twist barrel on.
I don’t seem the harm in going for a faster twist rate
K.H
I don’t seem the harm in going for a faster twist rate
K.H
I had a build spec’d recently for a 7-08; we won’t discuss the outcome but that had a 1:7 twist barrel on.
I don’t seem the harm in going for a faster twist rate
K.H
I'm currently having a 7mm08 built on a 24 inch barrel, I've no intention of firing more than a 140 or 150 grn bullet, I've been assured that a 1/7 twist will be ok but I'm dubious abt this twist, was wondering how you got on with that one you mentioned built with 1/7, in essence would you recommend it, thank uI had a build spec’d recently for a 7-08; we won’t discuss the outcome but that had a 1:7 twist barrel on.
I don’t seem the harm in going for a faster twist rate
K.H
I had a build spec’d recently for a 7-08; we won’t discuss the outcome but that had a 1:7 twist barrel on.
I don’t seem the harm in going for a faster twist rate
K.H
I had a build spec’d recently for a 7-08; we won’t discuss the outcome but that had a 1:7 twist barrel on.
I don’t seem the harm in going for a faster twist rate
K.H
I had a build spec’d recently for a 7-08; we won’t discuss the outcome but that had a 1:7 twist barrel on.
I don’t seem the harm in going for a faster twist rate
K.H
I'm currently having a 7mm08 built on a 24 inch barrel, I've no intention of firing more than a 140 or 150 grn bullet, I've been assured that a 1/7 twist will be ok but I'm dubious abt this twist, was wondering how you got on with that one you menti built with 1/7, in essence would you recommend it, thank uI had a build spec’d recently for a 7-08; we won’t discuss the outcome but that had a 1:7 twist barrel on.
I don’t seem the harm in going for a faster twist rate
K.H
I had a build spec’d recently for a 7-08; we won’t discuss the outcome but that had a 1:7 twist barrel on.
I don’t seem the harm in going for a faster twist rate
K.H
I had a build spec’d recently for a 7-08; we won’t discuss the outcome but that had a 1:7 twist barrel on.
I don’t seem the harm in going for a faster twist rate
K.H
Sorry I must state this rifle will be purely a hunting set up, I've no intention of shooting past 500 meters if even that, maybe this narrows it dwn a smal bit, so 24 inch barrel pushing 140 to 150 grn bullets, with a mod on(stalon x108), what would be my best twist option for accuracy even out to say 600, I want to make sure I make the rite decision before "pulling the trigger" on the build, my guy has a match barrel there, tikka action but the barrell has a 1/7 twist ready to go but obviously will make what I want, I'm in Ireland here also folks so no plan for lead ban on hunting rounds as yet so more than likely gonna be using lead for the nxt few years, thanks guys
K.H - Tikka
Well-Known Member
1:7 is a faster twist and will stabilise anything you put down it with ease. No need to settle/opt for the slower 1:8 in my opinion. Especially if it’s there, ready to go.
I never got my build - finished to the wrong specification and somehow found a home almost immediately; funny that!
K.H
I never got my build - finished to the wrong specification and somehow found a home almost immediately; funny that!
K.H
Lol, it is indeed, yea I reckon I'll ask him to make one in the 1/8 instead of settling, wana get it rite, on the ball folks
A faster twist, but for what purpose? A 1:8 is already considered fast in a 7mm-08 and will as you say, " stabilise anything you put down it with ease".
Scipio
Well-Known Member
Hello 
Interesting discussion. Well I think the old european 7mm cartridges have been using 1/8,5 twist rates to stabilize even the 173 gr lead bullets, and they did so fine i assume, to taken into consideration the lower density of copper of arround 20% and the longer and sleeker Low drag designs of some of todays coppers, well yeah, 1/7 or 8 might be a good number for being able to shoot sleek 140 something grn copper.
But when one is considering twist rate (to accomodate the use of longer bullets) in the 7mm08, and "future proof it", Should one perhaps consider the length of the neck of the case that one is using too? I say this in a context of being able to seat those longer bullets, without giving up too much powder capacity.
In that case, an older, but ballistically very similar cartridge, like the 7x57, might actually be more "future proof", might it not?
This said, i am only starting to reload myself, so more expert members on this board on reloading might be able to correct me here, (which i hope they do, if needed!).
Good luck with the new build!
PS. Regarding potentially going to fast on twist rates, i think Ron Spomer raised this topic once, so it might be a good idea to have a look for it on YT or spotify or similar. Found it:
Interesting discussion. Well I think the old european 7mm cartridges have been using 1/8,5 twist rates to stabilize even the 173 gr lead bullets, and they did so fine i assume, to taken into consideration the lower density of copper of arround 20% and the longer and sleeker Low drag designs of some of todays coppers, well yeah, 1/7 or 8 might be a good number for being able to shoot sleek 140 something grn copper.
But when one is considering twist rate (to accomodate the use of longer bullets) in the 7mm08, and "future proof it", Should one perhaps consider the length of the neck of the case that one is using too? I say this in a context of being able to seat those longer bullets, without giving up too much powder capacity.
In that case, an older, but ballistically very similar cartridge, like the 7x57, might actually be more "future proof", might it not?
This said, i am only starting to reload myself, so more expert members on this board on reloading might be able to correct me here, (which i hope they do, if needed!).
Good luck with the new build!
PS. Regarding potentially going to fast on twist rates, i think Ron Spomer raised this topic once, so it might be a good idea to have a look for it on YT or spotify or similar. Found it:
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Hi Hawkeye, I'm not a 7mm expert, but I just had a quick look on the Barnes bullets website (resources section) at the load data for 7mm-08 at the 120gr TTSX BT bullet. Front page of their load data sheet for this bullet quotes a 1:9.5" twist rate 24" barrel, so my guess is that if Barnes are recommending it, you won't be going wrong with your initial thoughts....
Quick update, going for a 1/8 twist on a 24 inch barrel forn the 7mm08 build to push 139 to 150 gr factory bullets(lead), not to flog a dead horse here but advice welcome if you think this is a good choice, for accuracy folks, seems to be half and half in terms of people recommending 1/8 and 1/9 but I'd rather be a small bit fast then to slow for stability
long_range_rob
Well-Known Member
I’ve had a Sako 75 in 7mm08 from new. It’s 1-9.5” from the factory and stabilises 100-140gn bullets beautifully. I’m yet to step over to copper with it but will be trying the Wappati 139gn when I do as that bullet was designed for a 9.5” twist.
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