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Thread: Imr-7383/imr-4064

  1. #41
    Boolit Master Maven's Avatar
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    What velocities did you see, and what alloy did you use? Powder coated or naked? Gas checked? Leading?...VP

    Alloy is basically WW + 2% Sn; velocity is ~1,600 - 1,650 fps, which is fast enough to punch paper. The CB's are GC'd and sized to fit the bore of my SKS (.316"), but lubed or tumble lubed when I'm lazy. There is no leading at all with this load, VP.

    Btw, a slow propellant like WC 860 with a small initiating charge of something like Lil Gun is also feasible and gives me 100% ejection and no leading.

  2. #42
    Boolit Master
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    Ok, thanks. Pretty low velocity, but that's to be expected.

    Vettepilot
    "Those who sacrifice freedom for security, have neither."
    Benjamin Franklin. (A very wise man!)

  3. #43
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    The practice cartridge for what the powder was developed for ran about 37000 psi. It does it's best in that pressure range, IME. Pick a velocity with a cartridge you want to use and 4350, 4320, 4064, 4831 powder that has a pressure near 36 K. Try to match your velocity with 7383 to that speed with a starting load near the starting grains shown by that listing. I have had my best success with it in cartridges of minimal case diameter to bullet diameter reductions. IOW, it likes 358 better than it likes 7mm 08. It works in 243, It works when sized down more but I got my best results in the 35's.
    [The Montana Gianni] Front sight and squeeze

  4. #44
    Boolit Master
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    Might be good then in 350 Legend?? Seems like I've heard that it's not all that great in 4570?

    Vettepilot
    "Those who sacrifice freedom for security, have neither."
    Benjamin Franklin. (A very wise man!)

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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