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Thread: IMR 4320 discontinued?

  1. #1
    Boolit Master

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    IMR 4320 discontinued?

    Has IMR discontinued 4320? It's not even listed at Graf or Powder Valley.

  2. #2
    Boolit Buddy
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    IMR 4320 is a great powder with a good nich in many mid sized cases as well as it works great in 223,etc
    However, from my experience Varget has almost duplicated it in this range, to include the 308, 223.
    beltfed/arnie

  3. #3
    Boolit Mold
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    It would appear that IMR-4320 is no more. It is not even listed on the IMR website as one of their powders. A shame.

  4. #4
    Boolit Master uscra112's Avatar
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    Yes, it would seem that Varget has taken the place of 4320. Same speed but easier metering and less temperature sensitive.
    Eleutheromaniac

  5. #5
    Boolit Grand Master


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    It was the best metering IMR stick powder ever made, right there with 7828 super short cut, I used it in 22-250 and 308.
    Charter Member #148

  6. #6
    Boolit Master
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    IMR 4320 is the very first powder I handloaded with as a 19 year old “kid”. As I moved from loading primarily for a 250/3000 in a Savage 99 to a 243 Win in a bolt gun, I went to IMR 4350 and my use of 4320 just about went to zero.

    You have to “know” that with the field of powders available being so crowded, there will be more losses of choices. It’s pure economics.

    Three44s
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    “There is more to this than dumping lead in a hole.”

  7. #7
    Boolit Grand Master


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    I just dug around in the powder cabinet and found a bottle of IMR 4320 and one of Varget. The Varget kernels measure .033 " diameter and average .062" long while IMR 4320 measures .033" diameter(same) and .042" long(.020 shorter). The original short cut powder!
    Charter Member #148

  8. #8
    Boolit Master 444ttd's Avatar
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    i never got good groups in my rifles with varget. i still have a half a pound or so.

    270 win in ruger #1
    130gr nosler bt
    47.0gr of imr4320
    left target at 100 yards/benched
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    Ayn Rand

  9. #9
    Boolit Grand Master


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    ........and IMR has the Enduron 4166 with copper fouling eliminator and real close in burn rate, its green too!
    Charter Member #148

  10. #10
    Boolit Master
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    I've used IMR4320 for several cartridges over the years. It was either discontinued or very hard to find for a while thirty or so years ago. I began using IMR4064 in place of 4320. I recall that with at least one cartridge, accuracy and velocity were unchanged and charge weights of the two powders were very close. I haven't bought either powder in years; H4895 has replaced them both for my purposes.

  11. #11
    Moderator Emeritus


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    Too bad if it is so. Like 4895 if you look at manuals it works in almost anything. I ended up with 7 lbs in an estate buy 10 years ago or more. He shot a lot of 6.5 tcu which was the powder for that. It does good in the 35 Whelen and several other cartridges including 17 Remington.
    [The Montana Gianni] Front sight and squeeze

  12. #12
    Boolit Master
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    it would have been nice if they had let us know it was being phased out as they did with 4759 give folks opportunity to stock up. Its amazing how many new powders have been introduced in past 15 years or so kind of like molds there are more options than ever before. I guess they just want everyone to work up new loads with new powders that will increase their sales.

  13. #13
    Boolit Master
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    That's too bad. The best 308 load I ever shot was with 4320 and the Sierra Matchking. Three shots under a dime at 100 yds.
    The strongest reason for the people to keep and bear arms is, as a last resort, to protect themselves against the tyranny of government.
    -- Thomas Jefferson

  14. #14
    Boolit Master



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    Thats unfortunate... I have a little on hand thankfully. Its my GOTO 308 powder.

    CW
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  15. #15
    Boolit Buddy
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    As ive said before, it figures since I chose it to standardize my rifle loads. Varget may be a great substitute, but not when everybody is buying it all.

  16. #16
    Boolit Grand Master 303Guy's Avatar
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    Quote Originally Posted by 444ttd View Post
    i never got good groups in my rifles with varget. i still have a half a pound or so.

    270 win in ruger #1
    130gr nosler bt
    47.0gr of imr4320
    left target at 100 yards/benched
    I'm surprised. I think of Varget as the benchmark powder.

    In my early days 4320 was not available to me but it was for me the benchmark from a loading perspective. It seemed to be the powder for the 303 Brit. What I had available was very close ( Musgrave MR200 made by Somchem) and I used 4320 data as a comparison to work up loads. That Musgrave powder was was very good. It performed well and produced very good accuracy in both my Brit and my mini 14. Velocity spreads were within instrument error almost, like plus minus 3fps. I didn't measure enough shots to get the true deviation. I wondered whether it was modeled on 4320.
    Last edited by 303Guy; 10-04-2020 at 03:00 PM.
    Rest In Peace My Son (01/06/1986 - 14/01/2014)

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  17. #17
    Boolit Grand Master Texas by God's Avatar
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    IMR 4320 was the first powder I used to reload my 22-250 shells in 1972. Great accuracy and it metered well from my tablespoon into the RCBS scale. The accuracy beat the expensive factory ammo($5/20) by a significant margin and the fragrance of the burnt powder was nice. I last used it for cast loads in 30-30 a couple of years back and it worked great there, too. I have six pounds of Varget in reserve, but 4320 will hold a place in my memories as long as I have memories.

  18. #18
    Boolit Master Eddie Southgate's Avatar
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    One of my favorites . Fortunately I have a little over 16 pounds so I won't be out any time soon .
    Grumpy Old Man With A Gun....... Do Not Touch !!

  19. #19
    Boolit Master



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    I have one can bought in the very early 70's. Price was $3.50 bought from a shop in MA. I have never used it in any cartridge I have loaded.so I do not miss it at all is that a bad thing?

  20. #20
    Boolit Master Eddie Southgate's Avatar
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    Quote Originally Posted by Geezer in NH View Post
    I have one can bought in the very early 70's. Price was $3.50 bought from a shop in MA. I have never used it in any cartridge I have loaded.so I do not miss it at all is that a bad thing?
    You will only miss it if you open the can . Very quickly give it to someone who likes it before you get hooked and end up selling yourself on the street to buy more .
    Grumpy Old Man With A Gun....... Do Not Touch !!

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check