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Thread: Smooth sided boolits and tumble lube?

  1. #1

    Smooth sided boolits and tumble lube?

    Do these boolits w/o lube groves work, if so how well, with tumble lube?

    I know they are used to powder coat. Are there any other advantages?
    Thanks!

  2. #2
    Boolit Master
    Yodogsandman's Avatar
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    Lead displaced from the rifling will ruin your bases.
    A deplorable that votes!

  3. #3
    What if they're gas checked?

  4. #4
    Boolit Master davidheart's Avatar
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    Quote Originally Posted by Jayhawkhuntclub View Post
    What if they're gas checked?
    Lead will be displaced by your rifling. The question you need to ask yourself is, "Where will that lead go?" Likely down toward the base of the boolit. If a GC is at the base of the boolit that GC may be forced off in some sort of incomplete manner which may cause accuracy issues...
    He who dwells in the shelter of the Most High Will abide in the shadow of the Almighty. -Psalm 91:1

  5. #5
    Boolit Master


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    I've been working with a no-groove Arsenal design for one of my .308s. Loading it 'as-cast', even with tumble lube, isn't likely to work 'cause the both the (bore-rider) nose and the base drop a couple thousandths undersize to allow for application of PC before final sizing. Fresh out of the mold, the nose and base of my 188-grainer mike .2985 and .3075, respectively; which I size to .300 and .310 after PC. Haven't really investigated thoroughly but I suspect, if you check the mold-makers specs, you'll find almost all PC-dedicated designs are going to cast on the small side.

    Bill
    "I'm not often right but I've never been wrong."

    Jimmy Buffett
    "Scarlet Begonias"

  6. #6
    The problem with a plain body bullet is lube.
    .
    .
    The lube groove, exists to hold lube, and to dispense that lube; as the bullet makes it's trip down the gun barrel.

    A lube coated cast bullet, (without lube grooves), may well not carry sufficient lubricant for that entire trip.
    The result will be leading at the point in the barrel where the lube runs out, ...and from that point, on to the muzzle.
    .
    .
    As for powder coating, I dunno, I've never done it;
    but, it seems to me that if a problem were to occur, it would happen, when/if, too much pressure and heat are applied to the bullet's base by too hot a load,

    which would melt the bullet's base,

    causing gas blow-by,

    and disrupting accuracy.

  7. #7
    Boolit Master
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    I believe on most, you are correct on the sizing. BUT the Arsenal sure seem to be accurate. The 6 mm sure does fit my lothar 6x45!

  8. #8
    Boolit Master popper's Avatar
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    Obviously, for a semi pistol it does work. I have NOT had any luck with PB in rifle (3 30 cal) using BLL and any soft (SOWW) alloy pushed very hard. GC helped a little. COWW worked OK & accuracy is better with the GC.
    Groove or groove-less doesn't matter, pressure and alloy do.
    Whatever!

  9. #9
    Boolit Master
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    If the gas checks are not attached firmly enough to keep from falling off the thousands of psi pressure behind them should keep them pushed in place.

    If lead displaced by the rifling will trail behind the base and deform it why doesn't it happen with ordinary cast bullet bases? Why doesn't the lead following the last lube groove get pushed aft likewise?

  10. #10
    Boolit Master
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    Should we be lubing the forward driving band so it doesn't cause leading before the first lube groove gets to the bore?

    Why is it that most bullet designs for auto-loading pistols have a single lube groove well back?

    Some think the lube distributed by the bullet currently being shot is primarily for the benefit of the following shot. That is why a lot of shooters traditionally fired a 'fouling shot' before getting down to serious work.

    BTW, I tumble lube all my pistol and revolver bullets with JPW and don't get lead fouling after 500 rounds or more.

  11. #11
    Boolit Master
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    Quote Originally Posted by BAGTIC View Post
    If lead displaced by the rifling will trail behind the base and deform it why doesn't it happen with ordinary cast bullet bases? Why doesn't the lead following the last lube groove get pushed aft likewise?
    Take a .38 special bullet with a bearing surface of .44" as an example. You will have a front driving band with a length of .07, crimp groove length of .05, middle band length of .085, lube groove length of .10 and the last full diameter band will have a length of .135. There will be a small amount of lead displaced from the final driving band trailing the bullet, however the bullet that has no lube groove will be carrying all the lead from the whole length of the .44 bearing surface with it. At least that's my theory...

    Accuracy is heavily dependent upon the bullet leaving the barrel with minimal disruption. Deformities/anomalies on the base cause much larger accuracy problems than deformations anywhere else.

  12. #12
    Boolit Master
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    NLG (no lube groove) boolits are designed EXPRESSLY for use with Powder Coating....NOT grease.

    I have NLG molds for 223, 9mm, 38, 40, and 45 cal and can see absolutely NO difference in performance. Just use your standard groove boolit molds you now have for PC.

    Don't waste money buying NLG molds that will only be of interest to un-enlightened PC'ers in the future if you ever wish to liquidate them. Some may disagree, but on the whole, PC only replaces grease as a lube and the PC sticks to the Pb where grease will come off if not in a grease groove for the journey down the barrel.

    All my MANY (!) grooved cast slugs shoot just fine with PC.

    And I always use GC's wherever the load data dictates high velocities/pressures that can gas cut the slug....PC or not. PC is NOT a replacement for a Cu GC. Would you use grease as a replacement for a GC??????? I think not. Think of PC is a modern day easy greaseless smokeless lead-free way of lubing a boolit.

    Good luck and happy loading!

    banger

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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