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Help with bullet choice for 7 mm STW

 
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  #22  
Old 10-12-2007, 09:38 PM
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JE from all of us new owners of the 7MM STW I thank you. I know this cartridge has been around for a while and it helps a lot to learn from yours and others past experiences. lets hope all of us can keep this cartridge around for many more years.
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  #23  
Old 10-13-2007, 10:28 AM
TMR TMR is offline
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Quote:
Originally Posted by Varmint Hunter View Post
"a 160 accubond at 3340 fps" I'd be careful about attempting this velocity with the 160gr. It would be way over in my rifle. I have talked to other STW shooters who can get 3,500+ with a 140gr bullet but I wonder what pressure those loads generate. I'm sure they are "wondering" too. These loads may work for some shooters but I'd suggest looking for a more modest velocity

I must be one of those guys then.....Only I don't wonder if the pressure is to high. I get 3360 fps out of a 28" broughton with the 168 bergers. So far the cases have been reloaded 7 times. There is no pressure, the bolt opens like there isn't even a case in it. Accuracy is very good, typical groups at 100 are in the .4's if I do my part. It might be the barrel though, this rifle doesn't seem to be very finicky. I didn't start to see pressure or a sticky bolt until around 3425, which is about 2 grains more powder. I did have a reamer made with a tight chamber and be able to touch the lands, while using the Wyatts box magazine. My Dad's rifle does 3320fps with a 27.5" Lilja barrel with the same load. ES and SD are both very low in these rifles.

So far, I have around 500 rounds through this rife ( we built it the end of Feb 07), and it is still shooting great. I have taken prairie dogs at just over 1100 yds with it. Hopefully the end of the month, she will get her turn at a deer or elk in Montana.

I originally started with H1000 and velocity were averaging 3297 with single digit es for 10 shots. It was a good load. Then Dad tried some RE-22 and found that he got more velocity. So, this week I have been testing RE-22 and finding that I still get the accuracy, low es and sd, and get another 70 fps. Well, the fact that I ran out of H1000 didn't help either.

The 7mm STW if a great round. I also have a 7mm Allen Mag. It seems to be a little more finicky, but once you find what she likes, its awesome.
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Last edited by TMR; 10-13-2007 at 10:36 AM. Reason: wasn't finished
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  #24  
Old 10-13-2007, 09:37 PM
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TMR, thats really odd, I couldn't come close to the same velocities with re22 that I had with H-1000. Mark Bansner reccomended re-22 but it just didn't give me the velocities that I felt I should get.
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  #25  
Old 10-14-2007, 11:21 AM
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RidgeRunner,

H1000 was my standard load. The weird thing was, my load in my Dad's Lilja barrel was close to 100 fps slower than my rifle. That drove him nuts, so he started looking for different powders. When he told me that RE-22 was running over 3320 in his rifle, I had to try it in mine.

We did some more shooting yesterday over the chrono just to make sure of things. Again, my rifle averaged 3362 with an es of 9 out of 10 shots. My 3 shot group was pretty much one ragged hole at 100 yds. Dads rifle was 3319 with an es of 6!!! His rifle shot the same way.

I did test some RE-25 yesterday with the 168. The velocity was just over 3400. There was a slight ejector mark, but no bolt lift resistance. Might be the ticket for the 180's. I will try to find a load for them after hunting season.
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  #26  
Old 10-14-2007, 02:45 PM
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What is the age of the RE-22 lot you are using? I've read that current lots of 22 and 25 give very irregular velocities.
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  #27  
Old 10-14-2007, 08:52 PM
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LewisH,

My RE-22 is March of 2007, and my 25 is Feb 2007. My Dad just bought a 5lb jug on Wed., not sure what lot number it is, but it shoots good.
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