308 load development for 200 & 215 great Berger s

Discussion in 'Reloading Forum (All Calibers)' started by Papa Charlie, Aug 12, 2018 at 10:56 AM.

  1. Papa Charlie

    Papa Charlie Silver $$ Contributor

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    I have been shooting 308 185 gr Berger Juggernauts at 500 yard F-Class matches. But want to develop a load for 1000 yard matches with Berger 200.20X and 215 gr hybrids. I will be using Varget powder.
    Rifle is .308, 30 inch, 5 Grove, 1:10 twist.
    What range of powder loads would you recommend for each and what velocities are you seeing?
     
  2. Stingray

    Stingray

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    43.8 grains of Varget 20 off works for me with the 20x - 2660 FPS/30" barrel.
    43.8 grains of Varget 13 off works for me with 215 Berger Hybrids.
    Strange that the same load works for both bullets.
     
    Last edited: Aug 12, 2018 at 8:18 PM
  3. creedfan

    creedfan

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    my load for the 200 20x = 43.6 varget .020 off 2601 fps 30 inch 5r barrel
     
  4. BP1

    BP1 Gold $$ Contributor

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    I Shoot the 200 20x 12 thousandth off with 43gr varget out of a 4 groove Kreiger 30” at 2600-2615fps.I have also shot the 20x 12 thousandth off with 45.2gr of n150 at 2675fps that’s also very accurate.Good luck and always work up slowly to any recommended loads.
     
  5. T-shooter

    T-shooter

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    Tread lightly. I had a primer blow out at 43.7g Varget using new prepped Hornady cases and Federal primers. The others fired with this load had slightly expanded case heads as compared to ones with less powder. All my loads are within .02g and the bullets are set to within .001" to the ogive (using a Hornady comparator). These were jumped .005". I don't have any chronograph data from that session but the same at 43.5 produced 2,560 fps from a 22 inch barrel. These seemed to group a bit better at .005" to .000" jump. 43.1g and 43.3g produced the tightest groups. I had to start over as I pitch my old worn out brass and went with new (same part number), later finding out they had about 7% more case volume.
    200-20.jpg
     
  6. swadiver

    swadiver Silver $$ Contributor

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    I would suggest using Palma brass. 30" Bartlein 1 in 10 twist barrel, Varget, getting 2700 fps here at sea level with Berger 200 Hybrids. you did not mention your freebore, which will have a big effect on how high a charge you will be able to safely load to. i have a .180" freebore in this barrel. velocity is your friend at 1000 yds
     
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  7. Papa Charlie

    Papa Charlie Silver $$ Contributor

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    My barrel is a Benchmark 30" chambered with a SAAMI National Match reamer. Freebore is ~0.110". I have loaded 200.20X at 0.010" OTL and still had 0.140" space between the charge and the bullet with 42.9gr of Varget. Neck tension is right at about 0.0015" using a .337" bushing. For my brass, I only use Lapua Winchester brass. Primers are CCI BR-2.

    Right now I am pulling 2731 fps with 42.9 gr of Varget using the Juggernauts and they seem to do very well at 0.010" OTLs and 500 yards. I have pushed them up to 44 grs but the rounds started to get squirrelly.

    I am thinking of starting the loads at 42gr and working up to 44gr. If I start to see any signs of pressure issues I will stop. I inspect every case when doing load development very carefully.
     
    Last edited: Aug 13, 2018 at 7:17 AM
  8. swadiver

    swadiver Silver $$ Contributor

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    you could also try Winchester brass to gain some extra capacity for a higher charge. the brass is pretty cheap, but won't last for more than a couple of firings at the high charge weights
     
  9. JBT

    JBT Gold $$ Contributor

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    I’m with swadiver...I would invest in Lapua Palma brass.
     
  10. Ned Ludd

    Ned Ludd Silver $$ Contributor

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    Papa Charlie, with 0.110" freebore, your throat/lead is going to be shorter than most people providing load info here. For that reason, the bullets will be sunk down deeper in the neck and you will have slightly less effective case volume. As a result, your pressure will be higher to reach any given velocity, so you're definitely going to want to start at the low end. Even more so with the longer 215 bullet. With the reduction in effective case volume and pressure concerns, you should be using Lapua Palma brass (sm rifle primer). Take my word and the word of everyone else here that's been shooting 200+ gr bullets in .308 Palma cases, standard .308 large rifle primer brass is not where you want to be. Make the switch - I promise you you'll never look back.
     
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  11. Papa Charlie

    Papa Charlie Silver $$ Contributor

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    What are you expecting to be different between a small and large primer case? I don't see how that will make any difference. But very interested in the science behind your comments.
     
  12. milanuk

    milanuk Team Savage Gold $$ Contributor

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    More metal around the primer pocket generally yields longer life before the cases are trashed from running competitive heavy bullet F/TR loads.
     
  13. damoncali

    damoncali Gold $$ Contributor

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    As someone who has smoked Lapua large rifle brass in 2 firings trying to get 215s to shoot, all I have to say is that while there are few no-brainers in shooting, Lapua .308 Palma brass is one of them. It's as simple as having more metal in the case head to resist the pressure. I was able to get 215s to shoot well, but not great. Juggernauts are very forgiving, accuracy wise, but you give up a lot of BC for that. I haven't tried the 200.20xs yet.

    For the 215s 42.5 grains of Varget showed promise, but I have a very long freebore - about .200. That's a pretty hot load in anything shorter.
     

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