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First batch


Toolndie7

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I finally got around to loading up some 308 for the first time. Been saving lake City, Hirtenberger, and federal brass for awhile and have had dies. Ive been reloading other calibers for awhile but first time with 308,  Got around to finally ordering powder and projectiles the other day and started off with some Sierra 168gr hpbt's over some Hodgdon Varget powder. Loaded some LC brass with a rough spread from 40.5-45gr of powder to see what my 308ar was keen on. Thought I would share the results. Distance was 120yds and Barrel is a Criterion 18.5" medium weight match SS 1:10  Groups are definitely not my best and I hadn't shot this rifle in quite sometime.

26156287_166797487268050_728866258482207

26066764_2000899833512172_81590521040868

26065502_140742509947203_915391373554955

26072998_1532551243466563_40313167771651

26068035_1728631490537006_28614094585866

26070369_247312675806097_809110347949119

26066277_167889137270315_695535291483134

26065793_1692419617463179_83353517240845

26225945_323537421486847_389598744720441

26066933_394997894246446_858046555920688

 

 

 

 

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2 hours ago, survivalshop said:

  What were the , SD & ES  on those shot groups ?   Any kind of pressure signs with the Cases ? 

Primer just started to flow into the firing pin hole at 45 grains nothing crazy I could just feel a slight "burr" with my fingernail. Im going to do more playing around 43 and 44 grains so im not worried.

as for Deviation and spread?  :laffs:You can calculate that if you like.  The fps shown was what I got for each shot in each group. Although it was shot through a $100 chronograph so make of it what you will.

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  You are making me do math , my Chrono does all that ES & SD for me , well, both of mine do ! :lmao:

  The reason I asked was , that the best ( lowest ) SD is alway what I go for , but it does boil down to best group . The best SD seems to be the most consistent in grouping for all those I test , but not always.

   Don't completely rely on the Primers for high Pressure signs , the fired Case can show  HP signs earlier then the Primer .

  Looks like your loads are shooting pretty good , which do you like ?  I like # 4 or # 8

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16 hours ago, survivalshop said:

 # 4 SD -  9.71 fps

 # 8  SD -  13.05 fps 

  I used this calculator - https://www.easycalculation.com/statistics/standard-deviation.php

Thanks for the link and doing some math SS :thumbup: I'm liking 44 grains but currently experimenting with 42.6 - 43.5 in .1 increments.  We shall see....

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16 hours ago, Sisco said:

42gr is a sweet spot for me with Varget, and with RL15 as well, although with RL15 41.8 is slightly better across all my 308’s.

Definitely like the way varget meters. I've never tried RL15 but have heard of it. Once I get the 308ar dialed in I want to do the same with the lrb M25 :banana: and she what she likes. With a 22" 1:12 barrel I'm sure it will be different. 

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6 hours ago, Toolndie7 said:

Definitely like the way varget meters. I've never tried RL15 but have heard of it. Once I get the 308ar dialed in I want to do the same with the lrb M25 :banana: and she what she likes. With a 22" 1:12 barrel I'm sure it will be different. 

 I cant wait to load test for my Socom , one more month :banana:

Edited by survivalshop
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