190 Bergers and 300 WM Sendero

Discussion in 'Reloading' started by MOOSE39465, Jul 25, 2011.

  1. MOOSE39465

    MOOSE39465 Well-Known Member

    Messages:
    130
    Joined:
    Nov 11, 2010
    Couple of Questions for the guys using 190 grain bergers in a Sendero 300WM.

    1. What type powder and how far off of lands for best accuracy?
    2. Is there any problems with the bullet being so long when bolting a round from magizine?
    3. What type accuracy are you getting at 100 yards?

    Thanks,

    Tony
     
  2. trebark

    trebark Well-Known Member

    Messages:
    3,475
    Joined:
    Jan 16, 2008

    1. Based on some quick internet searching, your go-to powder looks like RL25. In terms of how far off the lands for best accuracy, read this: http://www.longrangehunting.com/for...accuracy-berger-vld-bullets-your-rifle-40204/

    2. You should not have any problem feeding a round from the magazine as long as it will fit in the magazine.

    3. 100 yard accuracy does not tell you much. You will be better off shooting 200 or 300 yards to make an assessment of accuracy. Not to be too abrupt, but it doesn't really matter what accuracy others are getting. The 300win mag is capable to great accuracy. As a benchmark, good accuracy is .5moa or better.
     

  3. MOOSE39465

    MOOSE39465 Well-Known Member

    Messages:
    130
    Joined:
    Nov 11, 2010
    Thanks Trebark for the info. Only thing now is getting my hands on some reloading data.
     
  4. Broz

    Broz Well-Known Member

    Messages:
    8,637
    Joined:
    Feb 3, 2007
    H-1000

    I choose 210 bergers. But you will need to fine tune seaing depth for your rifle. I start at .040"

    Mag box no problem.

    I don't shoot at 100 much, but .75 moa is doable pretty easy with a little bedding, trigger work and a brake.

    Jeff
     
  5. trebark

    trebark Well-Known Member

    Messages:
    3,475
    Joined:
    Jan 16, 2008
    Broz advice on H1000 is a good one. H1000 is far more temp stable than RL25.

    For reloading data, contact Berger directly and they will email their data to you. Their data is heavily vetted by a lawyer, so you will find that it is a bit lighter than what you will find in other places. It's a good starting point though.

    Here are two good internet sources...

    308_7

    Sniper's Hide Reloading Depot - Sniper's Hide Forums
     
  6. ICANHITHIMMAN

    ICANHITHIMMAN Well-Known Member

    Messages:
    4,380
    Joined:
    Jan 31, 2008
  7. MOOSE39465

    MOOSE39465 Well-Known Member

    Messages:
    130
    Joined:
    Nov 11, 2010
    185 was my first choice. I noticed there was a recommended twist rate listed on there website. My Sendero has a 1 in 10 twist and I was worried that a 185 would not stabilize in my rifle. The whitetail in my area are small and a smaller grain bullet would be a better choice. Just didn't know if my rifle will shot them properly?
     
  8. eaglesnester

    eaglesnester Well-Known Member

    Messages:
    110
    Joined:
    Nov 11, 2007
    The info above is right on, however I would like to add my twobits here. You must keep in mind the above recipe is only a starting point for you. All rifles are different and all barrels are different and they all have different appetites. You may not be able to use RE25 you may find that RE22 or even IMR4831 works best for you. No matter what powder and bullet combo you start with I would recommend using the OCW method to findyour personnel best load. You can wear out a barrel trying to find the right combo and never find the accuracy you are looking for. By using the OCW method you may find your accurate load in as few as 18 rounds. Just Google OCW method.
    Cheers&Tighter Groups: Eaglesnester
     
  9. MOOSE39465

    MOOSE39465 Well-Known Member

    Messages:
    130
    Joined:
    Nov 11, 2010
    Thanks for the info guys. I will put this info to use.
     
  10. trebark

    trebark Well-Known Member

    Messages:
    3,475
    Joined:
    Jan 16, 2008
    1:10 will be fine with the 185grain bullets. Heck, it will stabilize the 210grain bullets too.
     
  11. MOOSE39465

    MOOSE39465 Well-Known Member

    Messages:
    130
    Joined:
    Nov 11, 2010
    Here is the load data sent by Mr Walt this morning. I belive im gonna give the 185's a try. Re-25 is fairly easy to come by around my house so I will start with that. Thanks

    300 Winchester MagnumBulletPowderStart LoadApproximate Start VelocityMax Load Approximate Max Velocity Fill Ratio185 GrainWW WXR71.0283174.8300296.3%185 GrainIMR 7828 ssc71.0286574.8302396.3%185 GrainVIHT N56071.5288075.2303295.3%185 GrainRE-2573.5287777.43027102.9%185 GrainH100075.5282879.53000102.3%185 GrainNORMA MRP71.5287775.4303496.6%185 GrainRAMSHOT MAGNUM77.0285881.23040102.3%185 GrainAA MAGPRO74.5285478.6302498.1%185 GrainH4831 SC72.0282676.0299097.4%185 GrainAA XMR 310070.0276473.8291097.6%185 GrainIMR 483165.5278869.3292892.0%185 GrainRE-2271.0286574.6300997.6%185 GrainIMR 435064.0284367.4297490.1%185 GrainH435064,5283967.7296290.0%185 GrainHybrid 100 V64.0276967.5289295.0%
     
  12. Long Time Long Ranger

    Long Time Long Ranger Well-Known Member

    Messages:
    2,612
    Joined:
    Mar 12, 2002
    I shoot the 190 bergers quite a bit in several rifles. You will be much better off with the 190 than the 185. Look at the velocity/bc ratio. The 190 is far better. My 300 win mags like 84-85.5 grains of Magpro. I think you will do well there and play with the seating depth.