243-8 twist

[Handi204]

I'm getting a 26" 243 8 twist barrel and need some advice on how heavy a bullet can I use.
Thanks

[celltech]

I have one from XCaliber and shoot 108 ELD-Ms at 3060fps. Consistently puts down 3/8" groups. I have not tried anything heavier.

[isacpotatoes]

I think you can use the same bullets a 6creedmoor will shoot, it just depends on seating depth. I want to get a 243 Ackley because of all my 308 brass. Some people say that the 243 AI competes with 6Creed if you can get a longer throat in barrel?

You’d have to ask a gunsmiths opinion I think. They are both over-bore cartridges. Like I said, I have 308 brass so I’d go that route, I just think you’ll sacrifice some powder with the 115’s


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[Handi204]

This is a Shilen barrel, replacing a factory that I bought used for my first barrel swap. It still shoots good just thought I would get a backup barrel.

[lonestardiver]

I'm getting a 26" 243 8 twist barrel and need some advice on how heavy a bullet can I use.
Thanks

Barrel twist determines how long of a bullet it will stabilize.
A longer bullet requires a faster twist than a shorter bullet.
ELD bullets can be longer then their same weighted conventional bullets and may require a faster twist.

A lot of this is seen in the 5.56/.223 realm with the steel core 62gr bullets. Being they are less dense than a mostly lead bullet so they are longer...and require a faster twist barrel to spin them fast enough to stabilize.


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[Apollo117]

Barrel twist determines how long of a bullet it will stabilize.
A longer bullet requires a faster twist than a shorter bullet.
ELD bullets can be longer then their same weighted conventional bullets and may require a faster twist.

A lot of this is seen in the 5.56/.223 realm with the steel core 62gr bullets. Being they are less dense than a mostly lead bullet so they are longer...and require a faster twist barrel to spin them fast enough to stabilize.


Sent from my iPad using TapatalkIf I may add to this good advice. A bullet with a larger bearing surface requires a faster twist. Bearing surface is the operative term. Bullet length obviously has an affect on bearing surface, but it's not the driving variable.

I believe the Berger VLD Hunter bullets are a good example of this concept. The bullet is long, but the bearing surface is small.

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[Bill2905]

Check the various bullet manufacturer product sites for their .243 (6mm) offerings. Most will list the recommended twist rates for each bullet they sell. Their advice may not be perfect for all barrels but it's certainly a good place to start.

[Robinhood]

6 creedmore

[No.343]

Berger claims that their 115gr bullet will stabilize in a 1:10 barrel.

[Shooter0302]

https://bergerbullets.com/twist-rate-calculator/

http://www.jbmballistics.com/cgi-bin/jbmstab-5.1.cgi (http://www.jbmballistics.com/cgi-bin/jbmstab-5.1.cgi)

[Orezona]

I want to get a 243 Ackley because of all my 308 brass.

Vaughn Precision did a cool 243AI build series on YouTube a few years ago.