I'm thinking of doing 1-9 barrel for my next 7mm rifle, talk me out of it.

I'm currently shooting the 180 ELDM's at 3130fps and taken them up to 3340fps in a 9 twist.

I also loaded them in my buddy's 1-8 twist 28 Nosler at 3070FPS and they've shot fine so far.

My next barrel is a 1-8, so we'll see. But they absolutely shoot good and stabilize in a 1-9. And I'm at sea level.
 
I didn't ever check the # of rifling's. Never worried or cared about that. I continue to learn more every day. Going back over my logs, the 180's were averaging slightly above 3100fps. I shoot at 5900'. The more I read, the more convinced I am becoming to go 1-8. I do believe Brian Litz, that a 1-9 would probably work just fine. Thanks to all. I appreciate reasoned, non-condescending answers. That's why I asked on this site. I had an STW that I just loved. I wanted to stay in that velocity class. Kids got into my reloading bench and changed the powders around. I didn't notice and blew that gun up. I don't need another gun but the new cartridge seems appealing, with the shorter, beltless body and much longer neck.
 
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I don't have any issues with 185s in a 9 twist at 3400. Couldn't keep them together in the first barrel that was a 4 grove at those speeds. 3200 was all it would do and keep them together. As stated above. Throat condition will also play a part on bullets coming apart. As the throat in my last barrel got worse, so did the blowups.
 
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Odd thing, with my 8" twist 7rum (short throat) the only thing that reliably holds together is a 175 eld-x. The Bergers and Sierra pills pop quite often. 168 and 180 Bergers popped; 180 and 183 Sierra's too... Those crappy little Hornady pills hold 1/2 moa as long as I keep the load a bit mild and use 50BMG to push.
 
I have a 7mm REM. Mag with a 26 inch SS barrel with an 8-1 twist, and 5R rifling. I am getting 3130 out of the 175 ELDX and 3170 out of 162 ELDX. It is a factory rifle. Reloader 26 and 25, (25 with the 162 bullet) and it has been a wonderfully accurate rifle. I am going after a big whitetail deer this weekend, hangs out in the back 40, and we will see.
 
xsn10s said:
I would get a 1-8" to run 180's. Throat condition could cause the bullets to come apart in mid flight too. Which is why I chose a 7mm Rem Mag. I can load it as hot or mild as I want. And with the 180gr ELDM's I let the BC do the work. I'd speak to a good barrel marker like Frank Green of Bartlein barrels on the subject.
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Agreed. Talk to Frank. He's a wealth of info and wants you to have a positive experience.

Also agree with others, throat and rifling type and profile may have a great deal to do with it.
 
The current trend is to over twist everything. My rifle background is long range benchrest. I was taught, pick your bullet and use the slowest twist you can get away with…I don't know how many 6br improved barrels I have toasted but the last few years I was shooting most all my barrels were 8.5 twist running 105 hybrids and the book says they shouldn't work.

I've built two 28 Noslers shooting 195's in 9 twist. It's fine…the monos are the ones that will force you to go faster.

Good luck!
 

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