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7mm STW Reloading Thread

 
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  #169  
Old 06-14-2013, 11:02 PM
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Re: 7mm STW Reloading Thread

Thanks very much! That is what I was looking for.
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  #170  
Old 06-15-2013, 07:25 AM
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Join Date: Aug 2008
Posts: 65
Re: 7mm STW Reloading Thread

Well I have finally found some time to get out and try some loads in my custom STW.

I went through the barrel break in process a while ago, but hadn't really spent much time on load development. I had worked up loads testing for pressure signs and recorded velocities, but none of the loads were grouping well at all.

The magazine will allow an OAL of 3.785" so that's where I was working from.
For a new custom rifle. (Krieger Barrel) I was getting a bit disappointed with the groups I was seeing. 2 - 4" groups at 100 yards.
So this week I went out and tried the same load in 3 shot groupings, each decreasing the OAL by 0.020"
I was really surprised with the results.

Load Details,
Nosler Custom Brass twice fired
Federal Match Primers
Hodgdon H1000 powder 81.5 gr
Matrix 168gr VLD bullets
Starting OAL was 3.785", tested down to 3.7585"

The groups started at close to 3" @ 100 yards, but with each decrease of .020" in OAL the groups shrunk, until 3.705" the group was approx. 3/4" then it started to open up again.

So it looks like the 3.705" load it what I will work with from here.
It surprised me how much varying the OAL would change the groups.

Velocity for this load is 3240 fps average, with ES of 11. (only 3 loads fired)

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  #171  
Old 07-06-2013, 10:28 AM
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Join Date: Apr 2013
Location: Fort Payne, Al.
Posts: 76
Re: 7mm STW Reloading Thread

Hey fellas, I'm in the process of finding the sweet load for my Sendero Stw. So far it appears to be impossible. 1 1/2 at a 100 is the best I've gotten with 140 gn ballistic tips. I've tried Rl 25, H1000, and Imr 7828 so far. I've got some loads with Rl 22 and Vv N160 to try as soon as the sun shines again. Im wondering if the first 3 powders mentioned are too slow for the 140 in this rifle.

With that thought in mind I've decided to try Sierra 160 gr Hpbt with the slower powders. Any suggestions?
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I pulled the trigger...the percussion caused the earth to halt rotating. And then the bullet hit and made it spin again.
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  #172  
Old 07-06-2013, 11:11 AM
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Join Date: Oct 2012
Location: colby kansas
Posts: 65
Re: 7mm STW Reloading Thread

Dont understand it but mine shoots better at 200 than it does at 100
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  #173  
Old 07-06-2013, 11:27 AM
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Join Date: Apr 2013
Location: Fort Payne, Al.
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Re: 7mm STW Reloading Thread

I've wondered about that Mulie.
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I pulled the trigger...the percussion caused the earth to halt rotating. And then the bullet hit and made it spin again.
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  #174  
Old 07-06-2013, 01:45 PM
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Join Date: Feb 2012
Location: West Terre Haute Indiana
Posts: 553
Re: 7mm STW Reloading Thread

Quote:
Originally Posted by 80 grains View Post
I've wondered about that Mulie.
Grains of powder ,Primer, Seating Depth?
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ButterBean
Remember.....Dont argue with stupid people,They will drag you down to their level and then win by experience
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  #175  
Old 07-06-2013, 02:11 PM
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Join Date: Apr 2013
Location: Fort Payne, Al.
Posts: 76
Re: 7mm STW Reloading Thread

Quote:
Originally Posted by ButterBean View Post
Grains of powder ,Primer, Seating Depth?
Sorry Butterbean...COL is 3.650 on all loads. The powders mentioned (25, 1000 and 7828) all started out at 73 grains and proceeded up to 81 with 2 gr increments. So 3 shells with , 73, 75, 77, 79 and 81.

All using 140 gr ballistic tips. Fed 215 primers.


I am the second owner of this rifle...
__________________
I pulled the trigger...the percussion caused the earth to halt rotating. And then the bullet hit and made it spin again.
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