close
Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Rifles, Bullets, Barrels & Ballistics

Rifles, Bullets, Barrels & Ballistics Applied Ballistics

Reply

338 Remington Ultra Mag load data desired

LinkBack Thread Tools Display Modes
  #8  
Unread 08-13-2001, 12:32 PM
Platinum Member
 
Join Date: May 2001
Posts: 2,369
Re: 338 Remington Ultra Mag load data desired

TXHunter

Like you said, the 300 RUM and 375 RUM cases are longer than the 338 RUM, by .1 inch I believe. (I believe this was to accomodate the 338 bullets in production with cannelures.)

I'll check the water capacity of a case this evening.
Reply With Quote
  •   #9  
    Unread 08-13-2001, 01:34 PM
    Silver Member
     
    Join Date: Jul 2001
    Location: San Antonio, Texas
    Posts: 244
    Re: 338 Remington Ultra Mag load data desired

    Presonaly I think it was a mistake not to have all the RUM cartridges the same dimentions. To hell with the damn cannelures!
    Reply With Quote

      #10  
    Unread 08-14-2001, 07:47 PM
    Platinum Member
     
    Join Date: May 2001
    Posts: 2,369
    Re: 338 Remington Ultra Mag load data desired

    Another load test tonight in the 338 RUM.

    Temp 80
    Humidity 80%


    I tried 90 grains of RL25 over the Fed 215M primers and the big 300 grain Sierra MatchKing. (Load Density 100%)
    OAL 3.650 (magazine limited)

    Four rounds over the Crony:
    2712 fps
    2709 fps
    2729 fps
    2735 fps

    Avg: 2721
    ES: 26
    SD: 12

    No pressure signs on any case, first round was cold bore.

    I tried the 300 Sierra MatchKing on a crop damage deer at 200 yards, pretty devastating.... it was a bang-flop proposition.

    BTW, water capacity for once fired cases, 111.3 grains (water to top of case, primer in backward)
    Reply With Quote
      #11  
    Unread 08-15-2001, 09:33 AM
    Silver Member
     
    Join Date: May 2001
    Location: NC
    Posts: 352
    Re: 338 Remington Ultra Mag load data desired

    David,
    seeinng how you've got the first venison of the season we can all come to your place for steaks right?

    Thanks for the info on the water volume. that 111.3gr H20 is just about the same as a standard 338 Lapua Mag volume. I've measured both Norma and Lapua, 338 Lapua brass, right out of the box and it measures roughly 112gr gr H2O before fireforming to my imporved case. I guess R25 is working good for you with those numbers. keep it up.

    Steve
    Reply With Quote
      #12  
    Unread 08-15-2001, 02:41 PM
    Platinum Member
     
    Join Date: May 2001
    Posts: 2,369
    Re: 338 Remington Ultra Mag load data desired

    Steve

    Yeah... it's the first venison... but we'll be having hamburger and not steaks!

    Thanks for the info on the Lapua 338, I didn't check any I have here.

    You might find it interesting to mote that I use my 338 Lapua dies to neck size and seat the bullets in the 338 RUM. I reset the sizing die to neck only and the seater I didn't need to change for the 250's, but I needed to run the seater in 1 5/8ths turns to seat the 300s to 3.650.
    Reply With Quote
      #13  
    Unread 08-27-2001, 02:58 PM
     
    Posts: n/a
    Re: 338 Remington Ultra Mag load data desired

    Dave,

    I received a 338 Rem Ultra as a gift from my wife a few weeks ago. It was very nice of her to hear me say that I was interested in getting one, then to go out and get it for me. Anyway, I mounted a scope on it, worked the trigger down to 2 1/2 pounds and then reloaded a few rounds for it. I had some H870 sitting around to start with and one hundred 300 grain Matchkings.

    Here is the data;
    Remington 700 Stainless Sendero 26" bbl
    Tasco 20x42 Sniper Scope (need a better scope!)
    ProChrono@15 feet

    300 Sierra MKHP
    COL - 3.775" (.010 off the lands)
    New re-sized/trimmed Remington Cases
    Fed 215GM
    Hodgdon H870
    100 yds.
    Altitude 8800 feet/Temp; 70F - 85F/slight breeze from any direction (mountains)

    88.0 gns 2233 fps (cleaned barrel)
    89.0 gns 2365 fps " "
    90.0 gns 2420 fps " "
    91.0 gns 2465 fps " "
    92.0 gns 2495 fps (cleaned barrel)
    93.0 gns 2485 fps
    94.0 gns 2565 fps
    95.0 gns 2610 fps

    88 to 92 gns went into 2.8"@100 yds. (I would expect from being cleaned after every round fired)

    93 to 95 gns went in to .550"@100 yds (without being cleaned after every shot)

    No pressure signs were visible on the cases. I cleaned the barrel after each of the first five rounds then after each three shot group.

    98.0 gns - 2575 fps
    - 2611 fps
    - 2594 fps
    Av - 2593 fps S/D - 54
    group size .880"@100yds.

    99.0 gns - 2649 fps (slight ejector mark)
    - 2597 fps (slight ejector mark)
    - 2674 fps (slight ejector mark)

    Av- 2640 fps S/D - 42
    group size 1.250"@100 yds

    100.0 gns - 2674 fps (ejector mark)
    - 2611 fps " "
    - 2549 fps " "
    Av- 2611 fps S/D - 38
    group size 1.760"@100 yds.

    99 and 100 gns is over max as the velocity fell off but the pressure increased. Accuracy went away pretty fast also. Looking at the data I would expect 93 to 95 gns to be the sweet spot. This rifle has no brake on it and it recoils very heavy. In fact it was very hard not to flinch as the charge and velocity increased. I may have to put a brake on it to survive the recoil. It kicks much harder than my 340 Weatherby in a Win Mod 70 Sporter.

    I'm not sure I trust the Standard Deviation that the chrono was giving me.

    I will be trying Reloader 25 and 22 this weekend with both the 250 Gameking and the 300 MKHP. I'll post the data if you are interested.

    Sorry for the long post.

    Guy
    Reply With Quote
      #14  
    Unread 11-10-2001, 05:50 PM
    Platinum Member
     
    Join Date: May 2001
    Posts: 2,369
    Re: 338 Remington Ultra Mag load data desired

    Move this to the top for a new members' use
    Reply With Quote
    Reply

    Bookmarks

    Thread Tools
    Display Modes


    Similar Threads for: 338 Remington Ultra Mag load data desired
    Thread Thread Starter Forum Replies Last Post
    300 ultra mag load data billywj Reloading 15 12-13-2012 10:18 AM
    Load data .243 Ackley varmit load please ballie Reloading 5 02-22-2011 01:49 PM
    Any good 180gr load data for 300 ultra mag?????? s.ferg Reloading 7 11-22-2006 06:46 PM
    Load data for 7mm Ultra Mag using H870 or WMR? The Butcher Rifles, Bullets, Barrels & Ballistics 1 03-27-2006 05:37 PM
    looking for load data for the 300 rem ultra mag and 130gr barnes Dr. John Reloading 11 03-14-2005 10:11 PM


    All times are GMT -5. The time now is 09:53 AM.


    Powered by vBulletin ©2000 - 2016, Jelsoft Enterprises Ltd.
    Content Management Powered by vBadvanced CMPS
    All content ©2010-2015 Long Range Hunting, LLC