300 RUM 220, 240 gr SMK velocities.

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by *WyoWhisper*, Jan 12, 2002.

  1. *WyoWhisper*

    *WyoWhisper* Guest

    As some of you know I am in the process of building a new toy ( woo hoo )thru the grace of the computer GODs I have lost some info.

    I need the best SWAG ( scientific wild ass guess )from someone in the relms of what type of velocities I can expect from..

    300 RUM with 28" barrel with 220 and 240 gr SMK's safely. Just close not holding anyone to their word. I am researching possibilities on the ballistics programs and this was my starting point.

    as always thanks in advance.....
     
  2. Darryl Cassel

    Darryl Cassel Well-Known Member

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    Hello Ric

    You know the 34" outfit I'm working with so my velocities would be quite a bit more then the 28" will give you.

    Try 3100 to 3150 fps with the 220 and 3000 FPS for the 240gr.

    I was able to get 3168 Fps out of the 240 gr in the 34" barrel so far.

    Hope that's close for you.

    DC
     

  3. *WyoWhisper*

    *WyoWhisper* Guest

    Thanks DC,

    I hit the road today to start the sport and travel shows and I thought my laptop had the info, or at least I thought I had the stuff on the laptop..... [​IMG]
     
  4. Boyd Heaton

    Boyd Heaton Well-Known Member

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    I would say about 3100 with the 220's too.I could get 3050 safely in a 26" tube.No clue on the 240's.
     
  5. Len Backus

    Len Backus Administrator Staff Member

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    However, Darryl, wasn't your result in the larger capacity, improved case?
     
  6. Darryl Cassel

    Darryl Cassel Well-Known Member

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    Len

    I'm using the results I had when fireforming loads in the standard Ultra case to come up with a ball park answer for Ric.
    It should be real close for his 28" rifle.

    Darryl Cassel
     
  7. Ultraman

    Ultraman Member

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    Wyo,
    I am in the process right now of building a 300 Ultra from the ground-up with a 30" Bbl but when I was doing load work with my old Ultra with a 26" tube I was getting 3025fps with the 220 MK's (RL-25 pwdr) and was getting distinct pressure signs when trying to exceed that. You having two more inches of barrel so the math in the above posts make sense. I have not played with the 240's yet