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Velocity question, 26-in barrel

 
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  #8  
Old 05-05-2014, 05:48 PM
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Re: Velocity question, 26-in barrel

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Originally Posted by MudRunner2005 View Post
Was that the 171 Match Burners?

If your STW was topping out around 3100 with 140's, something is wrong... My STW pushes 180's right at 3K, and I'm still climbing the velocity ladder to see if I can get higher while staying in that node.
yep, the 171's.

Actually, the 140 grain load I use has proven mild in my 7stw and I'll have to push it a bit to get 3300-3400 fps from it, but I don't really care as she shoots sweet loafing. I'm using a 24" 10" twist bbl. with a rather long chamber too, so you 9" twist guys won't hear what I land on for a full throttle load as it'll be slightly too much for your rifles. I actually am just going to push it to see where the top really is, and probably won't ever load there; it's good to know your cushion with a load.
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  #9  
Old 05-05-2014, 06:03 PM
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Re: Velocity question, 26-in barrel

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Originally Posted by Lefty7mmstw View Post
yep, the 171's.

Actually, the 140 grain load I use has proven mild in my 7stw and I'll have to push it a bit to get 3300-3400 fps from it, but I don't really care as she shoots sweet loafing. I'm using a 24" 10" twist bbl. with a rather long chamber too, so you 9" twist guys won't hear what I land on for a full throttle load as it'll be slightly too much for your rifles. I actually am just going to push it to see where the top really is, and probably won't ever load there; it's good to know your cushion with a load.
My mistake...I thought you meant you were topped-out on velocity. I didn't know 140's would be that slow to keep accuracy. I would have figured 3200-3300 would have been easily do-able in finding another accuracy node.

Yeah, at 71gr of 7828 SSC I'm not seeing any pressure signs with the 180's, and 3K fps is very nice. I might to bump it up to 71.5 to see if I can get an even 3,000 fps. Right now it's at like 2,965 or somewhere around there, figured another grain oughtta bump it up that extra 35 fps, while still being inside of that accuracy node. Who knows, might even be slightly more accurate. I'll just have to try it and find out.
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The 284 is to the STW what a tricycle is to a Ninja.
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  #10  
Old 05-05-2014, 11:28 PM
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Re: Velocity question, 26-in barrel

My best load for the 160 class STW is 80 gr of imr 7828 and a fed match magnum

primer. They run slightly over 3200. I just recently moved to the Nosler 150 LRAB. I think they are running closer to 3400. Great bullet, some ground squirrels were displeased with their arrival at silly distances.

I havent had a clear chrono day with the 150s the speed was backed into by drop data.
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  #11  
Old 05-06-2014, 07:05 AM
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Re: Velocity question, 26-in barrel

[QUOTE=MudRunner2005;950004]My mistake...I thought you meant you were topped-out on velocity. I didn't know 140's would be that slow to keep accuracy. I would have figured 3200-3300 would have been easily do-able in finding another accuracy node.

QUOTE]

Yep, I've got a bitchy 7mmstw rifle and I'm actually hesitant to make changes as she shoots well at the current load. I've also got a ton of them (400) loaded, so it would be a fun load change. The load was actually from my old rifle, and the new one just happened to shoot well with it. Never bothered to chrono as it was a "known load" and shot well. Found out after hunting season this year when I got the 7rum out and started flogging it that the stw was slow with 140's. Lucky my critter this year wasn't much further out (give or take a couple of yards from 480) as I wouldn't have had a chance once she started really dropping being off on velocity as I was.
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  #12  
Old 05-07-2014, 11:42 PM
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Re: Velocity question, 26-in barrel

QUOTE]

year wasn't much further out (give or take a couple of yards from 480) as I wouldn't have had a chance once she started really dropping being off on velocity as I was.[/QUOTE]

What speed were you actually shooting the 140s?
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  #13  
Old 05-08-2014, 06:41 AM
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Re: Velocity question, 26-in barrel

Quote:
Originally Posted by Big Jake Duke View Post
QUOTE]

year wasn't much further out (give or take a couple of yards from 480) as I wouldn't have had a chance once she started really dropping being off on velocity as I was.
What speed were you actually shooting the 140s?[/QUOTE]
3200 fps..
The load seemed rather mild, but shoots well and I had a couple of hundred loaded from the old rifle, so I loaded a couple of hundred more. This rifle is a slower twist with a generous chamber, so she wants more go juice. It is also a 24" bbl., so the short barrel throws another variable in.
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