RL22, RL25, IMR7828, H1000

Discussion in 'The Ammo & Reloading Forum' started by richbug, Jan 13, 2005.

  1. richbug

    richbug New Member

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    Does anyone have any experience with these powders? I am new to large overbored magnum powder hogs and new some insight. I could right a book on Medium and fast powders, but know nothing of these super slow powders. I am loading for a 300 WBY mag. Planning on using a 190-200 BTSP.
    I heard that RL22 is the same powder as Norma MRP which I would assume is what Norma uses in making factory Weatherby ammo. Is RL25 a Norma powder also?
    I shot a few(60) rounds of 300 WBY that was loaded with H1000, but that is my experience with it.
    IMR7828, I know nothing about.

    Concerns with these powders would be the effect of temperature on velocity and group size.
  2. AlleninAlaska

    AlleninAlaska New Member

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    Location:
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    7828 very dirty but a good choice.


    H1000 was the powder I used for 250 grain bullets in my 338/378 WBY. Very good for that purpose. Very good for heavy for caliber bullets.


    RL22 and RL25 are made by Alliant. Good powders for overbore capacity cases. I have used RL22 in 338 Win Mag with 250 grain bullets.


    The 300 WBY is not really that much of an overbore capacity case. Unlike the 300 RUM or 30/378 WBY. H1000 and 7828 would both probably give you higher velocities than RL22 or RL25 but the RL22 just might give better accuracy.
  3. richbug

    richbug New Member

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    Thanks allen. I was leaning towards the RL22 anyway, but needed a nudge. I want to work up a load that would be suitable for everthing from groundhogs to moose, so I can practice with one load, and know exactly what it does at any range from 5-500 yards. Assuming I can find a powder/bullet combination that will work. The 300 wby is way over bored for me. My next closest overbore is a .308 win....
  4. INSANEDESIGNS

    INSANEDESIGNS New Member

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    Grass Lake Michigan
    Well, you're speaking my language...I have just finished a MARATHON session with my .300 Wby Mag. I have it dialed down as good as it's going to get. I have settled on the RL22 powder, 180g Nosler Ballistic tip spitzer, and Winchester Magnum primer.
    This gun will now do whatever I ask it to. It was shooting all over the place until I started fiddling with the loads, I narrowed it down to 78.5 grains of RL22 gives me the "perfect" load for this gun, Might not work for others but, I tried some shells at 78.6 and 78.4 and could not believe the difference. I did not know this was such a game of precision.
    It has really opened my eyes to the importance of finding the right load for your gun. When I look at factory ammo boxes, I have to chuckle to myself. I always thought that ammo was ammo, the more I shoot these same cases, The better they get, I know someday I will have to replace them but until then, I'm lovin' it!
    Good luck with your .300 Wby Mag
    Joe