Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Reloading

Reloading Techniques For Reloading


Reply

308 SMK Load

 
LinkBack Thread Tools Display Modes
  #1  
Old 10-25-2011, 12:28 PM
Bronze Member
 
Join Date: Nov 2010
Posts: 46
308 SMK Load

Performed a ladder test yesterday using and I think I found a good load.

Remington 700 sps varmint 26" 1:12

Sierra MatchKing 168gr
H4895

41.5, 42 and 42.5 @ 100 yards were grouped at .426"

I will probably load 42gr

I was curious to see what others results were and if my load was in range with others.
Reply With Quote
  #2  
Old 10-25-2011, 10:09 PM
Platinum Member
 
Join Date: Jan 2011
Posts: 2,149
Re: 308 SMK Load

I use 47grns of Varget and a cci br2 primer under a 168SMK at 2.830" but only in Winchester brass that is neck sized. I have also used the same combo with hrndy 178 bthp match at 2.904" and pulled off a .271" 7 shot group. I only use H4895 under 155 and smaller pills.
Reply With Quote
  #3  
Old 10-26-2011, 08:19 AM
Official LRH Sponsor
 
Join Date: May 2010
Location: Bozeman, MT
Posts: 386
Re: 308 SMK Load

What was your es/sd? The more consistent load should be used.
__________________
The Tikka Performance Center Team
www.tikkashooters.com
www.tikkaperformance.com
Reply With Quote
  #4  
Old 10-26-2011, 09:22 PM
Bronze Member
 
Join Date: Nov 2010
Posts: 46
Re: 308 SMK Load

what is es/sd?
Reply With Quote
  #5  
Old 10-26-2011, 09:27 PM
Official LRH Sponsor
 
Join Date: May 2010
Location: Bozeman, MT
Posts: 386
Re: 308 SMK Load

That is your extreme spread and standard deviation.

A load that performs well at 100 that has high es/sd numbers will perform poorly as you reach further out.

This is why it is not only important for a load to be accurate at short range, but consistent enough in velocity to be accurate at long range.
__________________
The Tikka Performance Center Team
www.tikkashooters.com
www.tikkaperformance.com
Reply With Quote
  #6  
Old 10-28-2011, 02:07 PM
Platinum Member
 
Join Date: Dec 2005
Posts: 2,114
Re: 308 SMK Load

Quote:
Originally Posted by j-man View Post
A load that performs well at 100 that has high es/sd numbers will perform poorly as you reach further out.

This is why it is not only important for a load to be accurate at short range, but consistent enough in velocity to be accurate at long range.
'Tain't necessarily so.

Years ago, when several of us developed the load for Sierra's 155-gr. Palma bullet in the .308 Win. case, the load that the lab tested and produced the lowest spread in muzzle velocity and peak pressure was the least accurate of a couple dozen loads tested. The one we ended up using had a little less than average numbers for velocity and pressure, but it was the most accurate. Shot well under 4 inches at 600 yards in spite of 3/10ths grain powder charge weight spread.

Lake City Arsenal's M852 match ammo with Sierra 168's had about 42 grains of IMR4895. They used a charge weight that produced best accuracy within pressure and velocity specs. And best accuracy didn't always have the lowest spreads in averages for these two things.
Reply With Quote
  #7  
Old 10-28-2011, 02:29 PM
Official LRH Sponsor
 
Join Date: May 2010
Location: Bozeman, MT
Posts: 386
Re: 308 SMK Load

I was not referring to maximum velocity for pressure vs. a lower velocity for pressure reasons or how it effects accuracy. Every gun is different and prefers a certain velocity/burn rate/bullet combination.

If you es/sd are high, you will see vertical stringing the further out you go.

If a bullet is traveling 50fps slower at the muzzle than the bullet before it, it will hit lower. At shorter distances this is less prominent. Once you extend past a certain point for any given powder/bullet combination, the group will open up and vertical stringing will occur.
__________________
The Tikka Performance Center Team
www.tikkashooters.com
www.tikkaperformance.com
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: 308 SMK Load
Thread Thread Starter Forum Replies Last Post
Kirby Allen’s “no load development” load development method. WildcatB Reloading 70 09-24-2012 06:01 PM
260 Load Help.. Quick Load??? novaman64 Reloading 6 09-02-2012 11:48 AM
Load data .243 Ackley varmit load please ballie Reloading 5 02-22-2011 01:49 PM
338 RUM Load Capt Academy Reloading 0 10-04-2008 08:06 AM
Load for 7 WSM remingtonman_25_06 Reloading 3 01-15-2006 08:18 PM


All times are GMT -5. The time now is 03:41 PM.


Powered by vBulletin ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC