LETS TALK TWIST RATES

Talk about the AR15 style rifles chambered in 450 Bushmaster.

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LETS TALK TWIST RATES

Postby Bagel51 » Thu Nov 23, 2017 7:02 pm

So I've been doing a fair amount of research on this as I plan on building an upper shortly. I even done a twist calculator and it actually suggested 1:32 twist. I know the most common are 1:16 or 1:24, I did find a manufacturer that does 14,16, 18, 20,24,36 twist rates...my question is 1:16 (little more common, more manufactures) or 1:24 twist ok or should I really consider getting a different twist? Im only planning on using factory ammo. No custom loads. So any input would be greatly appreciated.
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Re: LETS TALK TWIST RATES

Postby Bmt85 » Thu Nov 23, 2017 7:42 pm

1:24 is probably the most common, does great with a wide range of bullet weights. While a faster twist (i.e 1:16) isn't necessary, it hasn't seemed to cause a problem. Although, 1:16 may be a bit much for pistol bullets over a stout charge. Just know that increasing twist rate will usually increase pressure for the same load. Factory ammo shouldn't be a problem, though.

For just Factory ammo, I say go 1:24. Seems to do great for just about anything.
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Re: LETS TALK TWIST RATES

Postby Hoot » Thu Nov 23, 2017 10:01 pm

Bmt85 wrote:1:24 is probably the most common, does great with a wide range of bullet weights. While a faster twist (i.e 1:16) isn't necessary, it hasn't seemed to cause a problem. Although, 1:16 may be a bit much for pistol bullets over a stout charge. Just know that increasing twist rate will usually increase pressure for the same load. Factory ammo shouldn't be a problem, though.

For just Factory ammo, I say go 1:24. Seems to do great for just about anything.


I agree though I'd bet the 1:16 twist barrels out there were developed using factory ammo as well and found to as you observed, not cause problems. For years, all we had was the 1:24 to experiment with and a lot of different loads were tested beyond factory ammo, both above and below 250gr. My first and last experience with a 1:16 did not go well, so I'm biased. Don't want to talk more about it than I already have. I do know a lot of bolt action enthusiasts are running the 1:16 and doing well by it. There were some 1:32 barrels available for a while from one of the member's company here at one time. Never played with one myself however, so I can't speak from experience. I can only say that the 1:24 has served me well and seems to be very forgiving.

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Re: LETS TALK TWIST RATES

Postby Bagel51 » Thu Nov 23, 2017 11:05 pm

I agree though I'd bet the 1:16 twist barrels out there were developed using factory ammo as well and found to as you observed, not cause problems. For years, all we had was the 1:24 to experiment with and a lot of different loads were tested beyond factory ammo, both above and below 250gr. My first and last experience with a 1:16 did not go well, so I'm biased. Don't want to talk more about it than I already have. I do know a lot of bolt action enthusiasts are running the 1:16 and doing well by it. There were some 1:32 barrels available for a while from one of the member's company here at one time. Never played with one myself however, so I can't speak from experience. I can only say that the 1:24 has served me well and seems to be very forgiving.

Hoot[/quote]


Well I haven’t found the 32 twist yet I did find a 1:36 twist. But I could keep looking. Lol. Thanks for the input. I still welcome any more info or experience with different twist rates. I’d also welcome any barrel company suggestions. I’ve been looking at Deadshot and Mcgowen so far
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Re: LETS TALK TWIST RATES

Postby Al in Mi » Fri Nov 24, 2017 5:57 am

Agree 24t is the norm, my #1 Ruger has a 10t shoots factory and handloads great.

I'll put a plug in for Gryphons barrels, my buds has just been amazing with everything put thru it.
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Re: LETS TALK TWIST RATES

Postby sbrGrendel » Sat Nov 25, 2017 10:38 am

Bagel51 wrote:I agree though I'd bet the 1:16 twist barrels out there were developed using factory ammo as well and found to as you observed, not cause problems. For years, all we had was the 1:24 to experiment with and a lot of different loads were tested beyond factory ammo, both above and below 250gr. My first and last experience with a 1:16 did not go well, so I'm biased. Don't want to talk more about it than I already have. I do know a lot of bolt action enthusiasts are running the 1:16 and doing well by it. There were some 1:32 barrels available for a while from one of the member's company here at one time. Never played with one myself however, so I can't speak from experience. I can only say that the 1:24 has served me well and seems to be very forgiving.

Hoot



Well I haven’t found the 32 twist yet I did find a 1:36 twist. But I could keep looking. Lol. Thanks for the input. I still welcome any more info or experience with different twist rates. I’d also welcome any barrel company suggestions. I’ve been looking at Deadshot and Mcgowen so far[/quote]

I'm new to the 450 Bushmaster and currently looking to get a barrel. I've looked at deadshot but for some reason I keep on thinking they don't do the machine work and they sell Satern Barrels. I looked at them for a Grendel barrel long ago but I could be so off darn memory when I need it. It up and goes blank. I've looked at achillies barrels too I like what I see but need to talk to them and get a price. I just have a problem buying certain barrel blanks, since you can't dress a pig up lol.

I know faster the twist the better the ability to stabilize bullets that are longer and/or heavier. X-Caliber barrels blanks are on par with Shilen and I wouldn't hesitate to buy one of them. Then there is what type of accuracy should we come to expect from a 450B barrel? All of these mfg selling barrels with a faster twist for the 450B have to know that everything is good to go or that's a lawsuit just waiting to happen.

So I'm looking for a barrel best bang for the $$$
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Re: LETS TALK TWIST RATES

Postby Hoot » Sat Nov 25, 2017 2:06 pm

Do yourself a favor and get the 1:32, 36, 3-whatever twist out of your mind. Don't go slower than 1:24. No point in painting yourself into a corner WRT what bullet lengths you can shoot. 90% of all AR15 based 450b barrels have a 1:24 twist for good reason. Not trying to bully you. If you get a twist in the middle of the spectrum, it will overlap at both ends. If you choose a twist at one end of the spectrum, you cut off half your options.

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Re: LETS TALK TWIST RATES

Postby TonyRumore » Sun Nov 26, 2017 9:16 am

We made about 20 barrels with the 1:32 twist. They didn't sell well, so we dropped them.
I went back and copied an old post I made back on 3/23/15 where I accuracy tested the 1:32 twist barrels with various 45ACP/45LC bullets.

TonyRumore » Mon Mar 23, 2015 1:37 pm
Here is a quick accuracy test for 5 shots at 100 yards with the 1:32 twist barrel.
I did not cherry pick the best groups or discount any fliers, shooter screw-ups, wind, or any other excuses. I only fired one five shot group with each load. All loads were with Lil Gun powder and WSR primers.

185gr Nosler HP 1-1/4"
200gr Speer HP 15/16"
230gr Hornady XTP 1.5"
250gr Hornady XTP 1-1/16"
300gr Sierra FP 1-3/4"

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