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338 300 grain SMK test results

 
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  #15  
Old 09-11-2007, 12:15 PM
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Quote:
Originally Posted by davewilson View Post
i'd like to hear the formula to safely shoot these bullets at 2000 instead of 3000. where i shoot 500 and over i can't drive or ride anything. i have to carry everything i need about 600 yards and then carry everything out to the target area, whatever distance it might be.i don't mind some exercise but it is extremely time consuming and that's what i'm short on. you mentioned a powder you were using to shoot at much slower speeds but is there a filler or something else involved to do this?

I did not use any filler. It was just 60 grains of N170 which was the slowest burning powder I had on hand. There was lots of air space in the case but it didn't matter.
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  #16  
Old 09-11-2007, 12:16 PM
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Originally Posted by Shawn Carlock View Post
GG,

On your findings, if I am not mistaken the 250's are made from the same jacket cups as the 300's thus a thicker jacket. Also if I remember right when I cut a 250 apart when they first came out several years ago the lead core goes clear to the tip. The 300 of course has an air gap from the tip to the core allowing the tiny SMK hollow point to actually work. I haven't had any apart for quite sometime but that is what I remember.
Thanks for reporting your findings. That would make perfect sense.
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  #17  
Old 09-11-2007, 04:58 PM
Chawlston
 
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GG,

What muzzle velocity are you getting with the 225s to get 2179fps at 1000 yards? I am getting 3220fps out of my rig w/225s and the JBM program lists the 1000 yard velocity as 1683.5fps. If you are getting 2179 at 1000 yards, that would probably set my chronograph on fire at 21 feet.

James
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  #18  
Old 09-11-2007, 05:29 PM
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Your speed of 1683 fps at 1K is based on an elevation of about sea level get up to the 8 to 10,000 feet of elevation where gg hunts and your velocity will around 2106 at 10,000 feet of elevation
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  #19  
Old 09-11-2007, 09:13 PM
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i called the sierra tech line today to see if they could clarify some of the things we've been kicking around in close but no cigar type of detail. they use the same exact cup to make each bullet as Shawn said. of course the 250 has to be trimmed a little because it's shorter.this does make for an ever so slightly thicker jacket on the 250. the base of the bullet is .050 thick and tappers to .012 at the tip. everything is the same on the 300 except the jacket is .011 thick at the tip. they both have the same exact hollow point behind the tip except the 250 would be ever so slightly smaller because of the .001 thicker jacket.anyways, this is what the tech said his spec sheet had on the 2 bullets.
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  #20  
Old 09-11-2007, 09:55 PM
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Quote:
Originally Posted by Chawlston View Post
GG,

What muzzle velocity are you getting with the 225s to get 2179fps at 1000 yards? I am getting 3220fps out of my rig w/225s and the JBM program lists the 1000 yard velocity as 1683.5fps. If you are getting 2179 at 1000 yards, that would probably set my chronograph on fire at 21 feet.

James
I am getting 3325 fps and I checked my bc at .568 and I run my charts anywhere from 4500 to 10,0000 feet elevations.



Dave,
thanks for reporting your Sierra inquiry. Good to know.
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  #21  
Old 09-11-2007, 10:20 PM
Chawlston
 
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GG.

My data is at sea level and I guess that is the difference. I was hoping you had some majic potion for me to use on my loads to squeeze a little more perfomance out of my 338RUM. With 101gr of H1000 and a 5.5 foot drop tube, I basically ran out of case capacity. No pressure signs at all. Thanks again.

Chawlston
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