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| The best performing powder in the .300 Win. Mag. for me is without any doubt the Norma MRP. After all my testing with powders of different make there was nothing equal to MRP. Best speed, best consistency from lot to lot, smallest extreme spread of all powders tested. Not cheap, but worth every penny.... |
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| IMR 4350 was my best pwder as well |
| | | Posts: 200 | Location: alberta canada | Registered: 16 February 2005 | 
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| 76gr RL 22, 180gr TSX 1/2in groups @ 3000 fps
There are two types of people in the world: those that get things done and those who make excuses. There are no others.
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| | | Posts: 1446 | Location: El Campo Texas | Registered: 26 July 2004 |
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| The powders I've used are IMR 4350, 4831, 7828, R-22. The best accuracy on paper was 4350. The best velocities a with excellent accuracy 7828. Bullets were 180 & 200 grain.  Member NRA, SCI- Life #358 28+ years now! DRSS, double owner-shooter since 1983, O/U .30-06 Browning Continental set. |
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| With 165 grain bullets mine likes IMR 4350 but when I switched to 180's I had to switch to H4831.
Don Nelson
Sw. PA.
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| | | Posts: 622 | Location: PA. U.S.A. | Registered: 12 May 2002 |
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| Both my 300 H&H and my (former)300 Winny get fed 200 grain A-Frames and H-4350. For the 180 grain bullets I use the same powder but from a 30-06 barrel.
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Winston Churchill
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| | | Posts: 28849 | Location: western Nebraska | Registered: 27 May 2003 |
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| Jro-45, I use several powders for several loads and 3 separate .300 Win mags, along with a .300 Ultra Mag. My favorite powder is IMR-4831 and H-4831 powder.
I also use RL-22 powder, it gives higher velocities with 180 grn bullets. IMR-4350 seems more accurate using Barnes X & TSX bullets. The use of IMR-7828 is used on the 200 grn Barnes bullets for highest velocities out of my rifles. |
| | | Posts: 60 | Location: Columbia, MO. | Registered: 02 November 2006 |
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| Go with Re25 or Retumbo, or try the new VvN570 when it's available. I like 83 grs. or Re25 with 180 NBTs or NPTs or Accubonds. ~3250 fps with 1 MOA accuracy in a 26" barrel. |
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| I'll put a vote in for Rel22. IMR4350, 4831 work nicely as well. |
| | | Posts: 109 | Location: BC, Canada | Registered: 20 July 2004 |
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| I've had the best luck with reloder 22, I tried H1000, H4831 and h4350, none deivered the velocity and accuracy that reloder 22 did. |
| | | Posts: 475 | Location: Moncton, New Brunswick | Registered: 30 August 2003 |
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| 78.0 grains of IMR 7828 and Nosler's 180 grain P.pt. is the way to go. RL 22 is right up there too. |
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| In mine for paper accuracy H 1000 for speed RL 22 I compromised on 180 gr bullets with IMR 4831, faster than H 1000 and more accurate trhan RL 22.
Windage and elevation, Mrs. Langdon, windage and elevation...
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| | | Posts: 944 | Location: michigan | Registered: 16 December 2004 |
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| The barrel I had on it before liked RL22. This barrel doesn't like RL22 but likes IMR4350 may like H4350 also. Will have to try some. But with Imr4350 I get 3060 FPS could go to 3100 with 180gr bullets. |
| | | Posts: 2209 | Location: Delaware | Registered: 20 December 2002 |
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