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6.5 Sin

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Unread 03-19-2012, 04:56 PM
Silver Member
Join Date: Oct 2010
Location: Watertown, SD
Posts: 322
6.5 Sin

Been swamped for the past months, I have my chamber reamer and HS gauges for the 6.5 Sin, still waiting on the die reamer. Expect more to come shortly.
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Unread 03-19-2012, 06:15 PM
Platinum Member
Join Date: Jul 2004
Location: SW MO
Posts: 1,322
Re: 6.5 Sin

Sweet! It ought to be a pretty impressive round.
The critters have to win every time, I only have to win once.

NRA Life Member
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Unread 03-19-2012, 06:34 PM
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Join Date: Feb 2006
Location: South Dakota
Posts: 39
Re: 6.5 Sin

I'm looking forward to following the progress on this.
Aim straight, and shoot em in the lips.
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Unread 03-19-2012, 08:31 PM
Silver Member
Join Date: Jul 2009
Posts: 245
Re: 6.5 Sin

What is the 6.5 Sin based on?

AR's for coyotes
25-06 M70 for coyotes
6.5-06 Remington Custom w/Leupold Mark IV 6.5-20 tactical setup
AR10 for mule deer
6.5-06 M700 for mule deer
338 Lapua Mag M700 for elk
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Unread 03-19-2012, 08:36 PM
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Join Date: Nov 2010
Location: Montana
Posts: 64
Re: 6.5 Sin

"Devin based it off a shortened RUM case however I am using 330 Dakota brass made by Norma" Long Time Long Ranger

I pulled this from one of the other threads and the 6.5 is just a necked down version from what I understand after following the other threads.
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Unread 03-19-2012, 10:34 PM
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Join Date: Mar 2002
Location: Wyoming
Posts: 2,612
Re: 6.5 Sin

Congratulations Devin, That is going to be a sweet 6.5. The 330 dakota brass will work guys in the 338 SIN if you don't mind a short neck. It was just very easy for me to neck the dakota and fireform since I didn't have a die to form the shortenned 338 RUM case. I think the 7mm Dakota is the same as the 338 Dakota and would work for the 6.5 if it is the same case. I would expect near 264 STW velocities with it and right now I am shooting 3800 fps with 123 Amaxes and 3750 fps with 129 sst's in the STW.
Predictions are difficult, especially when they involve the future
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Unread 03-20-2012, 02:27 PM
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Join Date: Jan 2005
Posts: 338
Re: 6.5 Sin

The 7mm Dakota is a lot shorter case in the body and overall length, than the 300 and 330 Dakota case. I've designed and built Wildcats on both of the Dakota cases ( 270 AMP 284 STAK ) and a Shortened RUM case( 7mmRHB ). The RUM brass is .545 at the web and the Dakota brass is .542 so they aren't interchangeable unless you don't mind a belly in you're fired rounds?

It's a lot less work to use the Dakota brass if the neck length is acceptable and the reamer is designed for it. Using short necked brass in a longer necked chamber is not a good thing for best accuracy as it allows the bullet to form into the excess space at the end of the neck under pressure before the bullet starts down the bbl.

Shortening brass for a wildcat is labor intensive and takes more skill to get good brass after the process !! I'm doing my own 6.5 Wildcat right now that is based on a shortened 6.5 X .284 case and it is always an adventure getting the steps just right. This round is designed to fit a standard short action and still be able to seat a 140 vld in the proper location while getting a boost in performance over the 6.5 x47, 6.5 Creedmore and the 260 Rem. It holds 4 more grains than the 260 even though it is about the same length as the 6.5 Creedmore.

The riffle is built and broken in so it's time to see what it's capable of. --- RHB
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