7mm 284

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dbro
Posts: 32
Joined: Sat Apr 14, 2007 6:24 am
Location: North of Toowoomba

7mm 284

#1 Postby dbro » Fri Mar 27, 2020 4:53 pm

Hi all I’m ordering a new barrel, just wondering what twist is best with 180 grain projectiles with a BC of 640 in a 7mm 284 30 inch barrel for F class. Cheers

willow
Posts: 567
Joined: Sat Aug 15, 2015 9:51 pm

Re: 7mm 284

#2 Postby willow » Fri Mar 27, 2020 7:31 pm

9 twist will work. 8.5 will comfortably drive 183/184gr pills if you decide to try something slightly heavier.

RDavies
Posts: 2318
Joined: Sun Feb 12, 2006 7:23 pm
Location: Singleton NSW

Re: 7mm 284

#3 Postby RDavies » Fri Mar 27, 2020 8:52 pm

As mentioned, 9" will work fine with the 180gn pills, but if you go to 8.5", a 284 will handle this fine and will allow you to try the longer 183gn pills if you do want to try them. If you definitely only want to limit yourself to these 180gn pills, then 9" twist is simple and readily available.

dbro
Posts: 32
Joined: Sat Apr 14, 2007 6:24 am
Location: North of Toowoomba

Re: 7mm 284

#4 Postby dbro » Sat Mar 28, 2020 4:59 pm

Thanks guys have ordered a 8.5 twist ... cheers


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