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Thread: Optimal Weight for supersonic 300 Blackout?

  1. #21
    Boolit Master

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    I like Lancer mags, had issues with PMAG's with the big 245/247gr boolits, I understand the newer gen3 mags work better with them.

  2. #22
    OK some more updates. So I seated some bullets to a "normal" length and shot them last night with good results function wise.
    I did not test for accuracy or even shoot on paper.
    I did get leading from about 1/2 way down the bore to the muzzle.
    My guess is that the alloy is too soft and is skidding, once it goes a ways down the barrel it's lost most of its hi-tek coating and leads like crazy.
    So back to the drawing board.

    I'll be casting some harder bullets this time around. I think I'll be done with the 311365 and try my hand at the Lee 309-150f now.

    I do have some 180 grain spire points cast hard, with some blue lube and gas checks on them. I might load some of them next for giggles

  3. #23
    Boolit Master Texas by God's Avatar
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    A member here provided some NOE 170 RN that I'm going to try with 296 powder and see how things shake out. They are full nose profile so I expect deep seating will be a must.
    Best, Thomas.

  4. #24
    Boolit Master popper's Avatar
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    i didn't have any luck with HiTek in the BO as yet. I'm running the 31-142C PCd in the rifle. I got decent results with 31-172C PB and 31-184C GC in the BO pistol. Actually got these for the 30/30. Did decent @ 50 with a scope and @10 with R.D. & SeeAll. Unfortunately the handguard keeps coming off from the bolt slam. Sort of mucks up accuracy tests - fire a couple then push it back on. Top end loads for the weight, BLL as lube. SA marked are SeeAll but couldn't get check weld so just 'guessed'. Riser should come in Monday, just figure the pistol is a 50yd gun anyway. Alloy is pretty soft 'mystery' metal I've been playing with, probably <1% Sb.
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    Whatever!

  5. #25
    That's pretty soft.

    I think i need a harder alloy.

    What are the rest of you running for alloy?

    I'm going to empty the pot and fill it with 2/3/95 ish alloy that I have. Should make for a hard bullet after water dropping from the last hi-tek coating

  6. #26
    Boolit Master


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    Quote Originally Posted by 1johnlb View Post
    The lee 155 has been a good performer in everything I've put it in. If your having trouble keeping it on the target, check your size to make sure it's big enough ans your alloy is hard enough.
    I agree. I push these to 1900 fps and have excellent accuracy. That's 3 shots at 50 yards. 17 grs IMR 4227, clipon wheel weights. Sized to .309
    Click image for larger version. 

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    "A Veteran - whether active duty, retired, national guard or reserve - is someone who, at one point in their life, signed a blank check made payable to "The United States of America", for an amount of "up to and including my life." That is Honor, and there are way too many people in this country who no longer understand it. -- Author Unknown"

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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