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Cauterucii bullets 7mm

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Unread 05-24-2009, 08:29 AM
Gold Member
Join Date: Mar 2004
Location: Las Vegas, NV
Posts: 610
Re: Cauterucii bullets 7mm

Before my last purchase from Bob (the last name is Cauterucio), he confirmed that he is no longer making any 7mm 176s, only the 189 grain 7mm bullets. He also confirmed that the 189 grain pill is identical to the 176, only heavier as he now completely fills the jacket with amalgum.

I've been warned by two different smiths that the 189s may need an 8.5 or potentailly 8.0 twist to stabalize, and that the 9 twist in my 7WSM may not get the job done (I assume that faster is better, but my stabaization formula is also showing that a 9.0 may not stabalize teh bullet at 2,940 fps.) I have not yet tested them so I can't answer teh question for oyu, only bring it up so that you are aware of the issue.

Look at this page about 1/3 the way down and you'll see a picture that I took of the length differences between the 7mm Berger 180, Cauterucio 189, JLK 180 and Sierra 175.

7mm Cartridge Guide

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Unread 05-24-2009, 02:09 PM
Platinum Member
Join Date: Mar 2005
Location: Utah
Posts: 1,375
Re: Cauterucii bullets 7mm

I managed to end up with a nine twist barrel instead of the eight twist I thought I was getting.

For the record the 189's are stabilizing at 2920 in my nine twist. I am at 5000' with an average station pressure of 25". I would / intended to use an eight twist. But, the nine is working, at least here.

I have also gotten some astonishing accuracy. The nine may actually be ideal....Just enough.
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Unread 05-24-2009, 10:20 PM
Silver Member
Join Date: Oct 2004
Location: South Illinois
Posts: 260
Re: Cauterucii bullets 7mm


What cartridge are you using and how fast are you pushing it?
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