280AI barrel twist

Warrior27

Active Member
Joined
Feb 14, 2020
Messages
36
Location
Missouri
There is a lot of good info on here about the 280AI and load/bullet data. I didn’t find a lot about twist rates and bullets. I’m looking at getting a rifle chambered in this round and would like opinions on barrel twist. I would like to use a little heavier bullets like the 162 ELD X or heavier and possibly the 175’s. Would the 1:9 twist be good or should I look at something faster? It will occasionally be used on elk out to 500 yds and mostly on whitetail, 6-700 yds. Thanks in advance for the input.
 

adk hunter

Well-Known Member
Joined
Apr 1, 2018
Messages
415
Location
Chestertown N.Y.
My 1-10 Lilja (22") loves 150's so 1-9 should get you where you have laid out. I also have a 1-8.? 22" proof I haven't had the chance to really fine tune.
 

Mikecr

Well-Known Member
Joined
Aug 10, 2003
Messages
5,133
Location
NC, oceanfront
Hornady's website tells you 9.5:1 for 162 ELD-X, 8.5:1 for the 175.
So you can plug the 175 into ballistic software and see the optimum twist for the atmospheric conditions you will be shooting at.
Example, for the 175 ELD-X:
At 32degF and sea level optimum would be 8.3:1.
At 70degF and 2,600 above sea level, 9.0:1 would be optimum.

I'm sure it helps to consider this stuff.
 

cowboy

Well-Known Member
Joined
Jul 14, 2007
Messages
1,107
Location
Mt., Id. , SD
I've been a 280AI user for a lot of years and been around quite a few more. When my 280AI barrel starts going I'll put either an 8" or an 8-1/2" twist on it.
I see you're listed as being from Missouri so you probably aren't too concerned about having to use lead free bullets but if you ever do want that option you'll wish you had a faster twist.
 

CTK

Well-Known Member
Joined
Dec 16, 2017
Messages
190
Location
Memphis, TN
I have always used 1-9. Having new one built and went with 1-8.7“. I did extensive research and discovered that this was the perfect twist rate for me due to the fact that it was the only Bartlein 2b contour barrel available immediately. 1-9” should be fine for most 160-175gr bullets. The 175 Berger Elite Hunter says that it will work with 1-9”.
 

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