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Thread: Why not 1/8 twist?

  1. #131
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    Without reading the last few pages of the techno crap and yes I am a techno crap kinda person and shoot a lot of long range precision, I will note that I have a 1/9 that is one of my MOST accurate barrels across the board all the way up to 77gr. On the other end of the spectrum I have a couple of 1/7 LW SS barrels from one of THE best makers out there and those barrels prefer 55 gr over heavier bullets. I am sure that someone has mentioned it, but individual barrels can have their own personality and preference. We can make a generalization however proof is in the puddin so to speak when it comes to deciding what each barrel actually likes or does not like. Bottom line I have had great success with 1/9 all the way to 1/7, but lets face it, if you are shooting long range precision this caliber is not the best choice anyway.

  2. #132
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    I'm just fascinated by the level of expertise and discussion in this thread.

    I don't know if anyone has suggested it yet, but should this thread be Sticky?

    Really good info.

  3. #133
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    Quote Originally Posted by Wormydog1724 View Post
    My 1:8 BCM SS 16" barrel is the most accurate barrel I've owned.
    Better than my 1:7 WOA SS 16" ever was.
    .
    The BCM 16" Stainless is my most accurate barrel as well. Better than 3 - Noveske N4 16", a BCM BFH LW 14.5", a Rainier Arms Select MedCon 16", and better than the SCAR 16s. Although I'm not an accuracy junkie by any means, I just notice the difference. Makes common ammo a little more accurate across the board.
    Last edited by ScottsBad; 02-22-14 at 14:25.

  4. #134
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    The "I shot one of these and one of those" comments are counterproductive, you don't have enough info to be able to claim the twist is why one shoots better than the other.

    I have never obseved the correlation of barrel twist and the "optimum" bullet weight for that twist in test firing. I have never shot a statistically significant number of different twist barrels in test fixtures to claim there is NO difference but I have shot enough to say any difference is less than the combination of my shooting skills and barrel to barrel accuracy differences.

    Also the bullet not tracking the trajectory theroy has never been observed in rifle trajectories that I know of. It comes from artillery or mortars where the projectile has to make a VERY sharp turn at the top of a VERY steep trajectory.

  5. #135
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    Quote Originally Posted by Todd.K View Post
    The "I shot one of these and one of those" comments are counterproductive, you don't have enough info to be able to claim the twist is why one shoots better than the other.

    I have never obseved the correlation of barrel twist and the "optimum" bullet weight for that twist in test firing. I have never shot a statistically significant number of different twist barrels in test fixtures to claim there is NO difference but I have shot enough to say any difference is less than the combination of my shooting skills and barrel to barrel accuracy differences.

    Also the bullet not tracking the trajectory theroy has never been observed in rifle trajectories that I know of. It comes from artillery or mortars where the projectile has to make a VERY sharp turn at the top of a VERY steep trajectory.
    I simply pointed out that my SS barrel shoots better than any of the others I have, I made no claim that it was due to the barrel twist. In fact, I'm sure it is more accurate for a number of reasons including the chamber and the type of rifling. I was merely implying that the 1/8 twist didn't make the rifle LESS accurate than the 1/7 barrels I have.

    I was also pretty clear that my evidence is only anecdotal.
    Last edited by ScottsBad; 03-01-14 at 23:33.

  6. #136
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    I have a Rainier Ultramatch on my 10.5 SBR and haven't found a weight that it doesn't like yet.

    I DO NOT get paid for my reviews.

  7. #137
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    Bullet quality and accuracy expectations are the two most significant factors when barrel twist is less than optimum. The barrels in my match rifles were called 1:8, but were in fact 1:7.75 twist. A good quality 55g projectile shot well out of my match rifles with 20" barrels out to 300 yards. I did not observe the same accuracy with a 1:7 twist barrel. My observations are based on firing roughly 6,000 rounds per year through match rifles. You have to decide your accuracy expectations and the range of bullet weights you will be shooting before deciding on barrel twist rate. Your ability should also be a factor in your decision concerning equipment and ammunition.

    When shooting mass produced factory ammunition, barrel twist is more of a concern to me for general shooting. A 1:8 barrel firing mass produced match ammunition has performed well for me in match rifles for quite a few years and I believe it has the potential to be a good all round twist rate for a 16" carbine. The quality of many of the barrels is quite good these days, so a current 1:7 barrel should be better than 1:8 barrels made 30 years ago.

    Like I stated earlier, if I owned a carbine with a 1:7 twist barrel, I would not replace the barrel with a 1:8 twist until my barrel was worn out. Unless you are a bench rest shooter, you probably won't notice much of a difference.
    Last edited by T2C; 03-02-14 at 22:05.
    Train 2 Win

  8. #138
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    Ok I didn't want to start a 500 page which is better thread. I was wondering if since the majority of rounds fired from members on here are between 55-62 grains, why shouldn't my next AR ( and I already have 2 1 in7 AR's) and a SME is shooting 1in8, what might be any problems I might run across. While soothing 55-62 grain rounds.
    The journey of a thousand miles begins with one step...and a lot of bitching.

  9. #139
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    Assuming you're running a decent quality barrel you won't run into any problems with a 1/8 twist rate and 55-62 grain projectiles.

  10. #140
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    Quote Originally Posted by Todd.K View Post
    Also the bullet not tracking the trajectory theroy has never been observed in rifle trajectories that I know of. It comes from artillery or mortars where the projectile has to make a VERY sharp turn at the top of a VERY steep trajectory.
    This... and rifle bullets don't apparently arc nose down at the end of the trajectory like Artillery shells. They retain the same pitch from muzzle to target.
    "You people have too much time on your hands." - scottryan

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