300 RUM - Hodgdon US869

Discussion in 'Reloading' started by Varmint Hunter, Aug 23, 2009.

  1. Varmint Hunter

    Varmint Hunter Well-Known Member

    Messages:
    2,522
    Joined:
    Dec 26, 2001
    I've been using Hodgdon's US869 in the 300 RUM with Berger 210 VLD bullets. 101.1 gr of 869 gives me 3,150 ft/sec in a 27" Broughton bbl with single digit SD. Accuracy @ 200yds has been .5 moa and better. Pressure appears to be less than any other loads that I've tried.

    Has anyone else been using 869 and heavy bullets in their RUM?
     
  2. royinidaho

    royinidaho Writers Guild

    Messages:
    8,853
    Joined:
    Jan 20, 2004
    Answer is Yes.

    However my RUM is a 338. Bullet is 300 SMK. Single digit ES. Typically identical velocitys 5 out of six shots and the wild one is always 1 FPS high. Accuracy is 1/5 minute or better.


    Thanks for posting. I think a trend is in the process of being discovered.
     

  3. rhouser

    rhouser Well-Known Member

    Messages:
    129
    Joined:
    Jul 8, 2009
    I am interested in your finding. I have been shooting the Retumbo with the 200 smks, but, I have a box of the berger 210 hunters. I may get a pound of the US869 and see how it does. I am shooting a 26" barrel so it may turn out a little slow for me. Is anyone using the IMR 7828 ssc for anything. Availability is running my life these days. thanks for the word on US869. rc
     
  4. bigbuck

    bigbuck Well-Known Member

    Messages:
    1,650
    Joined:
    Jun 20, 2009
    Thanks for the post , I shoot 210 grain bergers I also have a broughton heavy contour barrel man they are sweeeet I currently use retumbo but I have 1 pound of us 869 just setting on the bench looks like I'm going to try your load this week I'll post back and let you know how it turns out for me:)
    Thanks again for the info.
     
  5. royinidaho

    royinidaho Writers Guild

    Messages:
    8,853
    Joined:
    Jan 20, 2004
    Yep, in my 270 AM 7828ssc is the goto powder for 140/150 class bullets. Its the only stick powder that I've tried that doesn't bridge. Load is around 83 grains for either bullet.

    Velocities are 3600+ and 3500+ respectively. Accuracy is outstanding.

    It will be back to US 869 when WC 169s appear.
     
  6. bigbuck

    bigbuck Well-Known Member

    Messages:
    1,650
    Joined:
    Jun 20, 2009
    Varmint hunter, What is your OAL on your us 869 load? I have loaded up a few rounds last night my OAL is 3.675 . US 869 101.1 GRAINS

    bigbuck
     
  7. Varmint Hunter

    Varmint Hunter Well-Known Member

    Messages:
    2,522
    Joined:
    Dec 26, 2001
    I don't measure for a traditional OAL. I use a Stoney Point gauge and measure off the ogive. I am currently shooting with the bullet .020" off the rifling. There is still room in the case with the 101.1 gr of US869 and I haven't seen any indication of excessive pressure yet. However, 3,150 ft/sec with a 210gr bullet is as fast as I'm interested in pushing them big boys.

    Thankfully I had Kirby put one of his PK brakes on the Broughton. The big 300 RUM recoils less than my .308 win.
     
  8. rhouser

    rhouser Well-Known Member

    Messages:
    129
    Joined:
    Jul 8, 2009
    Big Buck, post what you find with the US869. I am following this closely. On the subject of Muzzle Brakes, I have been thinking about a brake if I can find one that won't blind and/or deafen my spotter (maybe won't need a spotter if the brake calms things down enough.) Is there such a thing? rc
     
    Last edited: Aug 28, 2009
  9. royinidaho

    royinidaho Writers Guild

    Messages:
    8,853
    Joined:
    Jan 20, 2004
    A brake and a properly set up rifle will allow spotting your own hits. BUT, there is always a need for a spotter (second person).

    Get the hearing protection (muffs) for both of you with the voice/hearing capability., use plugs also, if you would like to).

    Keep lots of batteries on hand, JIC.

    Makes for great communication during the shot prep.
     
  10. bigbuck

    bigbuck Well-Known Member

    Messages:
    1,650
    Joined:
    Jun 20, 2009
     
  11. Chopaka81

    Chopaka81 Well-Known Member

    Messages:
    330
    Joined:
    Oct 9, 2007
    I wish I had read this post yesterday. Just loaded up 20 rds incrementing upwards from 98.0 grs to 99.0, then 100.0, 100.5, & stopping at 101.0 grs. I am loading the 208gr AMAX, using FED 215 primers and RP brass (4 rds each). Mainly looking for pressure right now.

    FWIW, One LRH member regularly feeds his 300 RUM 104.0 grs of US 869 driving a 240gr SMK.

    I am going to proceed upwards from 101.0 grs in 0.5 grs steps mic'ing the case heads as I go.

    I have a 30" Benchmark barrel on my rifle.
     
  12. Varmint Hunter

    Varmint Hunter Well-Known Member

    Messages:
    2,522
    Joined:
    Dec 26, 2001
    I'd be very interested in your observations.
     
  13. Chopaka81

    Chopaka81 Well-Known Member

    Messages:
    330
    Joined:
    Oct 9, 2007
    Today I got in a brief range session with the Rummy, 208gr AMAX's, Fed 215GM primers, RP Brass, and US869 powder. The results were very promising. nice groups, 0.4 to 0.8 @ 100 meters. No signs of pressure even at 101.0 grs of US869.

    I did not cronograph the loads, I was mainly looking for pressure sings and then accuracy. I mic'd the case heads and I have not detected expansion. Today I shot 4 rds of each charge, stopping to clean the bore after each 4 shot group. After cleaning I fired a fowling shot from the next level and then 3 for accuracy.

    I seat my bullets out just off the lands, they are to long for the magazine. I did not measure the COL, I will post it later.

    I am going to continue in 0.4 grs steps upwards from 102.0 grs to 104.4 grs using the same components listed above. I will cronograph from here up.

    Wonder how everyone is doing?
     
  14. Chopaka81

    Chopaka81 Well-Known Member

    Messages:
    330
    Joined:
    Oct 9, 2007
    I completed my range testing of the 208gr AMAX loads of 102.0 grs thru to 104.0 grs. The group sizes are coming in nicely, had one sweet load at 102.5gr (1/4 moa, 3164 fps avg) and then it opened back up (1 moa).
    As I continued upwards towards 104.0 they began to decrease to 1/2 moa & 3224 fps avg.
    I am going to continue upwards in 0.3 grs steps towards 106.0grs as I continue to look for another dip in group sizes.
    I have been carefully mic'ing my cases and so far no pressure signs.
    I am using FED 215 GM primers.