300rum ver 7stw

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by seriousscout, Oct 28, 2010.

  1. seriousscout

    seriousscout Member

    Messages:
    17
    Joined:
    Jul 15, 2010
    looking for any info on the conetic energy on 300rum ver 7stw at long range 700yd and better for big game huntinggun)
     
  2. texan79

    texan79 Well-Known Member

    Messages:
    353
    Joined:
    Mar 28, 2010
    What bullet weights and what velocities are you wanting to compare?
     

  3. ICANHITHIMMAN

    ICANHITHIMMAN Well-Known Member

    Messages:
    4,380
    Joined:
    Jan 31, 2008
    300 rum hands down. Bigger hole always wins simple math. Big holes are harder to plug. Think TITANIC
     
  4. BMcKell

    BMcKell Well-Known Member

    Messages:
    144
    Joined:
    Nov 15, 2005
    I load my STW with 180 Bergers at 3050 fps, and my 300 ultra was 210 Berger at 3025. I forget the exact numbers but I think I remember the Stw had more energy at 1000. After that comparison I decided my 300 was useless and turned it into an Edge.
     
  5. seriousscout

    seriousscout Member

    Messages:
    17
    Joined:
    Jul 15, 2010
    i have a 300rum and 300wm shotting burger vld168gr pushing 3250 fps, i want to build a 7 mm stw, bullets berger vld 140 or 160 looking fps about the same dont know yet havent got that for yet
     
  6. Long Time Long Ranger

    Long Time Long Ranger Well-Known Member

    Messages:
    2,612
    Joined:
    Mar 12, 2002
    I have five 7mm stw's and two 300 ultramags. I can give you any velocities you want out of my guns. I don't know about kinetic energy but if you want to know which kills the best it is the larger caliber shooting the heavy bullets. Kinetic energy and killability are two different things. Bullets hitting animals are not done in a perfect world physics lab with an equation of mass times velocity. Way more complicated than that. Trust me, I'm not a doctor.
     
  7. str8shoot

    str8shoot Well-Known Member

    Messages:
    161
    Joined:
    Jul 27, 2010
    For downrange energy you gotta go with the heavy for cal bullets.
    Your 168 30 cal load at 3250 has only 1067lbs at 1000 yards
    A 7stw with a 168 at 3100fps has 1334lbs at 1000
    If you can get 3250fps out of a stw with 168s it would have 1500lbs at 1000 yards
    However if you shot a 210 vld out of a 300rum at 3100fps you'd get 1664lbs at 1000 yards.
    If you are concerned about energy at long range, forget the 140s in 7mm or the 168s in 30 cal. You gotta be thinking about 168-180gr in 7mm and 190-210gr in 30 cal.
     
  8. nddodd

    nddodd Well-Known Member

    Messages:
    1,409
    Joined:
    Aug 30, 2005
    My 300 rum shoots 210 gr smk's at 3225fps that's over 2500 ft lbs of energy at 1000 yds with the g5 drag model, g1 is 1650 I don't see the stw doing that, just my personal opinion.


    Nathan
     
    Last edited: Oct 29, 2010
  9. str8shoot

    str8shoot Well-Known Member

    Messages:
    161
    Joined:
    Jul 27, 2010
    Nathan, while I agree with you that your 300rum load can't be matched by the 7stw, in order to get over 2500lbs at 1000 yards with a 210 smk at 3225 you'd have to be well over 15000 feet altitude. At 5000 feet, where I ran the other numbers it is about 1875lbs. Still about 400lbs more than the 7stw at the same velocity with 168s. So not arguing your point, just keeping the numbers equal. Not many people hunt close to 15000 feet above sea level, at least not in North America.
     
  10. Long Time Long Ranger

    Long Time Long Ranger Well-Known Member

    Messages:
    2,612
    Joined:
    Mar 12, 2002
    str8shoot is right on. If you are shooting beyond say 800 yards or so go heavy. Right now I am hunting antelope at long range with my 300 ultramag shooting the 208 amax at 3210 fps. I have taken big game animals beyond 1000 yards with a 7mm-300 wby which is the same as a 7mm stw. It was done with the 175 grain SGK which was the only thing we had at that time for long range 7mm's.

    These are accuracy loads for one of my 7mm stw's with a 26" hart barrel. 140 grain bullet at 3547 fps. 162 Amax at 3330 fps. 175 SGK at 3218 fps. Run these through JBM or the calculator on the site and see what you get. I have no idea. Either will do the job as I have taken long range animals with both. Anytime you go bigger caliber and heavier bullet you gain killability. Obviously a 105 mm howitzer will kill better than a 22-250. There are small incremental gains as you go up from the smaller to the larger. So I guess the howitzer would kill something deader than the 22-250. Last year my son shot his antelope with a 257 wby and I shot mine with a 338-378 wby. When they were lying there in camp mine looked deader but that may be a biased opinion.
     
  11. nddodd

    nddodd Well-Known Member

    Messages:
    1,409
    Joined:
    Aug 30, 2005
    It was showing 2500 ft lbs of energy with the g5 drag model at 400ft elevation and 1650 with the g1 drag model the g5 model matches my drops closer than the g1 model that's why I showed both. I'm using my ballistic app on my I phone it may not be a good way to measure energy but it does a good job using it to figure my drops.


    Nathan