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6.5 ss final design

 
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  #78  
Old 04-18-2013, 04:12 PM
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Re: 6.5 ss final design

Some news on the build. Both PTG (go gauge) and Whidden (dies) said they will ship this week. I picked up this nice Manners MCS-t3 from a forum member and also an action, last week. All I need now is a SA bottom metal. Hopefully, my smith can do something next week? Here is a pic of the stock....Rich6.5 ss final design-dscf0521.jpg
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  #79  
Old 04-19-2013, 12:09 PM
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Re: 6.5 ss final design

Whats the OAL of the case? Did you shorten the SAUM brass a bit to get the neck back behind the ogive of a 140 Berger at 2.95" or so? This sounds like a neat project and I bet it works well. It is a lot similar to My .264 Raptor Which sends 130 bergers or Accubonds over 3200 with a 24" Barrel. Yours will make a great cartridge for almost anything from Mountain hunting to F Class! Good Luck!

7 SAUM, 264 Raptor, 7WSM, 270 WSM




Sub 6lb (with scope) Mountain rifle.

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  #80  
Old 04-19-2013, 12:47 PM
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Re: 6.5 ss final design

Quote:
Originally Posted by IChaseCoues View Post
Whats the OAL of the case? Did you shorten the SAUM brass a bit to get the neck back behind the ogive of a 140 Berger at 2.95" or so? This sounds like a neat project and I bet it works well. It is a lot similar to My .264 Raptor Which sends 130 bergers or Accubonds over 3200 with a 24" Barrel. Yours will make a great cartridge for almost anything from Mountain hunting to F Class! Good Luck!

7 SAUM, 264 Raptor, 7WSM, 270 WSM




Sub 6lb (with scope) Mountain rifle.

Very nice! The case is 1.96" in length but the secret is the length to the base of the neck which is .320". This allows the long bullets to be seated properly for max performance and still fit in a 700 mag box. Taper was removed from the body and the shoulder sharpened to gain back some capacity (around 71 grains h2o) and also to lengthen throat life......Rich
p.s. looks like the Raptor has a 35 degree shoulder?
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  #81  
Old 04-19-2013, 01:29 PM
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Re: 6.5 ss final design

Ahh, So shortened a bit but shoulder pushed back also. I avoided pushing the shoulder back to make sizing easier. The boat tail on the 140 berger hangs just below the neck when seated to fit a Wyatt's box, but the 130 fits quite well. The design also allows the use of a 130 accubond in a Model 7 action which I like for some builds.
I'll definately be checking this thread to see the SS when you get it running with those 160 Matrix bullets. The website says they are bonded, and if thats the case I might have to try some out!
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  #82  
Old 04-19-2013, 05:09 PM
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Re: 6.5 ss final design

Rich
Can you give me a breakdown of the differences between your round and the 6.5 RSAUM, and the advantages to your round. Looking for a 6.5 with the case capacity to use H1000(slower powder) for more barrel life at lower pressures.
Thanks
Jim
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  #83  
Old 04-19-2013, 05:57 PM
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Re: 6.5 ss final design

Quote:
Originally Posted by trueblue View Post
Rich
Can you give me a breakdown of the differences between your round and the 6.5 RSAUM, and the advantages to your round. Looking for a 6.5 with the case capacity to use H1000(slower powder) for more barrel life at lower pressures.
Thanks
Jim
Hi Jim......The 6.5 saum is simply a 7 necked down to 6.5 There is nothing wrong with that except you need a long action to seat the long bullets out where they need to be. The difference in this case is, the shoulder is pushed back, the body taper is blown out, and the shoulder is changed to 40 degrees. This allows the bullets to be seated properly in the case to fit in a SA and the new case dimensions make up most of the lost capacity from pushing the shoulder back. Also, the shorter powder column should increase the efficiency a bit. Bottom line is, I believe the velocity will be on par with the 6.5 saum but will be much more short action friendly. Also, barrel life should increase with the long neck and 40 degree shoulder. I hope this answers your questions....Rich
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  #84  
Old 04-19-2013, 08:19 PM
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Re: 6.5 ss final design

Yep, that covers it.
Should get over 3000 rounds or more with this using H1000 and keeping pressure at 58,000 or less from what I am reading about the 6.5 saum which your case is a slightly better design in my mind.
Should get 3200+ with the 130's and 3100+ with the 140's out of a 26" barrel.
Let us know your results.
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