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7mm WSM 180 ELD Twist #15563575 12/24/20
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nyrifleman Offline OP
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I have a Model 70 classic stainless in 325 WSM sitting in a Bridges McMillan I picked up and am getting ready to call PacNor for a barrel.

Rifle weight is 6lb 11oz stock with Dead Nutz mounts BTW.

Going to set this one up to shoot heavies, specifically the 180ELDM. Have 200 on hand, along with 180 Bergers and 175 Partitions, along with a pile of brass.

I have other 7mms from 7X57 up to and including 7mm Rem Mag in the safe which shoot 140s - 160s well, so not looking to replicate.

This may just be a rifle I shoot paper with, or it may go afield, not sure yet.

Hornady suggests a 7.5 twist.

Any reason not to go with an 8 twist for the bullets listed?


“We do not really own high grade guns, we are only their curator for our lifetime.” - Rich Grozik

Re: 7mm WSM 180 ELD Twist [Re: nyrifleman] #15563720 12/24/20
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Jordan Smith Offline
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An 8 twist is about perfect.

Re: 7mm WSM 180 ELD Twist [Re: nyrifleman] #15564823 12/24/20
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JGray Offline
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I just started a similar project - my Kimber 8400 325 WSM is getting a Lilja 1:8 chambered in 7mm SAUM with the plan to shoot 180 Scenars. My gunsmith concurred on the 1:8 as ideal for that application.

Re: 7mm WSM 180 ELD Twist [Re: nyrifleman] #15565803 12/24/20
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1911a1 Offline
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Tag,
interesting


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Assumption is the mother of mistakes
Re: 7mm WSM 180 ELD Twist [Re: nyrifleman] #15565896 12/24/20
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UncleAlps Offline
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How about 8.5 twist? Seems Ruger has adopted this now. Wonder if it will stabilize the 180 gr ELDX?


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Re: 7mm WSM 180 ELD Twist [Re: UncleAlps] #15567572 12/25/20
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nyrifleman Offline OP
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Originally Posted by UncleAlps
How about 8.5 twist? Seems Ruger has adopted this now. Wonder if it will stabilize the 180 gr ELDX?


Factory twists often rely on tradition and not common sense.

Although 8.5 isn't terrible.


“We do not really own high grade guns, we are only their curator for our lifetime.” - Rich Grozik
Re: 7mm WSM 180 ELD Twist [Re: nyrifleman] #15567640 12/25/20
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efw Offline
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Originally Posted by nyrifleman


Hornady suggests a 7.5 twist.

Any reason not to go with an 8 twist for the bullets listed?


I don’t know what’s available in 7mm ROT from different manufacturers and recognize Jordan’s experience here so not being a smart a$$ at all but didn’t you answer your own question here?

Or maybe a better way to say it would be to ask whether there is a down side to going with a faster than necessary twist?


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And beauty abounds?

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Re: 7mm WSM 180 ELD Twist [Re: nyrifleman] #15567672 12/25/20
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aalf Offline
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For reference, I built a 7x300 WM on an 8.5" twist Bartlein, and ran 195 EOL Bergers to 2K in it just fine.

Re: 7mm WSM 180 ELD Twist [Re: efw] #15568183 12/25/20
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Jordan Smith Offline
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Originally Posted by efw
Originally Posted by nyrifleman


Hornady suggests a 7.5 twist.

Any reason not to go with an 8 twist for the bullets listed?


I don’t know what’s available in 7mm ROT from different manufacturers and recognize Jordan’s experience here so not being a smart a$$ at all but didn’t you answer your own question here?

Or maybe a better way to say it would be to ask whether there is a down side to going with a faster than necessary twist?

A 7.5 twist wouldn’t hurt anything, but an 8” twist achieves super stability (SG of 1.5, which maximizes the BC value) with the 190 ATip and 180 ELD from the 7WSM at sea level and -40 F weather.

Re: 7mm WSM 180 ELD Twist [Re: nyrifleman] #15568386 12/25/20
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nyrifleman Offline OP
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Jordan, what effect, if any, would the 8 twist have on the Scenar and ELDM?


“We do not really own high grade guns, we are only their curator for our lifetime.” - Rich Grozik
IC-B

Re: 7mm WSM 180 ELD Twist [Re: nyrifleman] #15569260 12/25/20
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JGray Offline
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When discussing twist rates for the 7mm SAUM/180 Scenar with my gunsmith, 1:7,8 and 9 were my choices from Lilja. When I mentioned to him I didn't think I wanted to go slower than 8, he responded he wouldn't personally choose 7. So 1:8 it is...

Re: 7mm WSM 180 ELD Twist [Re: nyrifleman] #15571642 12/26/20
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Jordan Smith Offline
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Originally Posted by nyrifleman
Jordan, what effect, if any, would the 8 twist have on the Scenar and ELDM?

It’d shoot just fine, and would achieve super stability. I shoot the 180 ELD-M at 2950 fps from 8” twist barrels with no problem.

Re: 7mm WSM 180 ELD Twist [Re: nyrifleman] #15574447 12/27/20
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nyrifleman Offline OP
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Thanks all.

In the absence of any reasons not to use the 8 twist, that is the plan.


“We do not really own high grade guns, we are only their curator for our lifetime.” - Rich Grozik
Re: 7mm WSM 180 ELD Twist [Re: nyrifleman] #15581807 12/29/20
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beretzs Offline
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Originally Posted by nyrifleman
I have a Model 70 classic stainless in 325 WSM sitting in a Bridges McMillan I picked up and am getting ready to call PacNor for a barrel.

Rifle weight is 6lb 11oz stock with Dead Nutz mounts BTW.

Going to set this one up to shoot heavies, specifically the 180ELDM. Have 200 on hand, along with 180 Bergers and 175 Partitions, along with a pile of brass.

I have other 7mms from 7X57 up to and including 7mm Rem Mag in the safe which shoot 140s - 160s well, so not looking to replicate.

This may just be a rifle I shoot paper with, or it may go afield, not sure yet.

Hornady suggests a 7.5 twist.

Any reason not to go with an 8 twist for the bullets listed?


You'll love the 8 twist. My Mashburns have been 8's and there isn't anything they haven't shot well to be honest. From 120 TTSX's to 195 Bergers. Throating them right is the trick with the 7 WSM, but man, when my 9.5 is worn on my WSM, it'll get an 8 as well.


Semper Fi
Re: 7mm WSM 180 ELD Twist [Re: nyrifleman] #15584667 12/29/20
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Big Stick Offline
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A dirty "secret" is 9" will do it. Hint.

I just "happen" to have (3) 7 Whizzum's on Montucky's and "probably" shoot it in 700 too and have had 70's chambered same. Hint.

On a schitty fhuqking Winchester build,I'd go 8".

Hint.............................


Brad says: "Can't fault Rick for his pity letting you back on the fire... but pity it was and remains. Nothing more, nothing less. A sad little man in a sad little dream."
Re: 7mm WSM 180 ELD Twist [Re: nyrifleman] #15602469 01/02/21
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MallardAddict Offline
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No issue with the eld or Scenar from my old 7 wsm and it’s 1:8 twist bartlein

Re: 7mm WSM 180 ELD Twist [Re: nyrifleman] #15602834 01/03/21
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nyrifleman Offline OP
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PacNor, Krieger, or Lilja?


“We do not really own high grade guns, we are only their curator for our lifetime.” - Rich Grozik
Re: 7mm WSM 180 ELD Twist [Re: nyrifleman] #15603248 01/03/21
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Talus_in_Arizona Offline
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I ran 1:9 and it did fine with 180s.


I do not entertain hypotheticals. The world itself is vexing enough. -- Col. Stonehill
Re: 7mm WSM 180 ELD Twist [Re: nyrifleman] #15603610 01/03/21
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Big Stick Offline
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Originally Posted by nyrifleman
PacNor, Krieger, or Lilja?



I'd grab whatever Greg has on the shelf,which connected the most dots for the project. No point waiting on a spout,when splendid wares are ready to roll and his plate runneth over with 8" RPM blanks. Hint...................


Brad says: "Can't fault Rick for his pity letting you back on the fire... but pity it was and remains. Nothing more, nothing less. A sad little man in a sad little dream."
Re: 7mm WSM 180 ELD Twist [Re: nyrifleman] #15603614 01/03/21
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Jordan Smith Offline
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Originally Posted by nyrifleman
PacNor, Krieger, or Lilja?

Of those, I’d probably go PN.

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