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Type: Posts; User: DrB

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  1. Replies
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    Thanks navy, leadman. While I've read a lot on...

    Thanks navy, leadman.

    While I've read a lot on duplexing I've not had a reason to try it.

    Smokeless powder unlike black is extremely burn rate dependent on pressure. If you fail to achieve...
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    Interesting data point... a 300 blk with 247 gr...

    Interesting data point... a 300 blk with 247 gr bullet would be about twice the sectional density though.

    In 45 caliber it would be the equivalent sd of a little under 600 gr bullet weight, right?...
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    Thank you, navy. I appreciate the reply. 16"...

    Thank you, navy. I appreciate the reply.

    16" cmmg, carbine length.
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    I'm familiar with duplexing, looking for specific...

    I'm familiar with duplexing, looking for specific experience on the cartridge.

    I have a bunch of wc860 (like a lot of folks) and was curious about the possibility in a heavy for caliber...
  5. Replies
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    358,217

    Forum: Cast Boolits

    If anyone has data that shows a kind of period...

    If anyone has data that shows a kind of period for group size with velocity (rpm) that would be neat.

    There is a phenomenon called "roll resonance" that occurs with spin stabilized bodies in...
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    wc860 in 300 blk with 230+ gr bullet

    Anyone ever try something like this with or without a "kicker" of fast burning powder?

    I'm looking for actual experience/trial.

    Thanks. DrB
  7. Replies
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    Forum: Cast Boolits

    Yes, pmc, I did see what might be minima for...

    Yes, pmc, I did see what might be minima for group size at different spots in load development, but they were different for different powders and I think corresponded to increasing initial pressure...
  8. Replies
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    3,680

    Forum: Cast Boolits

    Pmc, for hunting, I do like a large meplat bullet...

    Pmc, for hunting, I do like a large meplat bullet of relatively soft lead. My experience has been that I get good expansion at around 950 fps with a soft lead tin alloy and the large meplat ensures...
  9. Replies
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    3,680

    Forum: Cast Boolits

    Pmc, I haven't done 308 win load development...

    Pmc, I haven't done 308 win load development yet... Mostly I've been shooting 7tcu with my 308 can.

    I would go with a fairly soft and untacky lube that will separate well from your bulllet at...
  10. Forum: Cast Boolits

    Conservation of momentum says lube flinging from...

    Conservation of momentum says lube flinging from the bullet one direction means the bullet has the opposite resultant vector of the sum of the momentum vectors of the lube bits (it goes the other...
  11. Replies
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    Poll: Eagle view, my regrets for not following up...

    Eagle view, my regrets for not following up promptly when you sent out the new stubs. I have been wrapped up in a property purchase and related shennanigans.

    All, the short of it is the weld...
  12. Thread: What are these?

    by DrB
    Replies
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    3,772

    +1 on the isotope containers (inference based on...

    +1 on the isotope containers (inference based on geometry).

    The radiused slots down to the bottom were to get grippers onto the contents, the holes at top were for a crossbar which probably both...
  13. Replies
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    19,624

    Oh, it's a bad sign when you find yourself...

    Oh, it's a bad sign when you find yourself tempted to build a rifle just so you have a reason to buy a new caliber mold. "Sounds like it could be a nifty caliber for big game..." "I don't have a...
  14. Replies
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    BK: :) I've been shooting mine for months!...

    BK: :)

    I've been shooting mine for months! It's great! :-P

    :kidding:
  15. Replies
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    Forum: Boolit Lube !

    Sticky: Love to gear. Give me a day or two and i'll pull...

    Love to gear. Give me a day or two and i'll pull it together and paste it in.

    Best regards,
    DrB
  16. Replies
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    1,253,752

    Forum: Boolit Lube !

    Sticky: Gear, its the linear acceleration together with...

    Gear, its the linear acceleration together with twist rate that results in torque/rifling pressure, not velocity. You could have huge torques at 50fps, and no torque at 3000fps.

    Rifling pressure...
  17. Replies
    3,054
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    1,253,752

    Forum: Boolit Lube !

    Sticky: Popper, I've been meaning to get around to this...

    Popper, I've been meaning to get around to this calc to get psi loading on the lands for a while. The outline I worked out goes:

    Get max linear acceleration of bullet (should be maximum just...
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    Anyone ever figure out what the alloy was? :)

    Anyone ever figure out what the alloy was? :)
  19. Replies
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    26,262

    Poll: Lowell, welcome to the forum. I have been at...

    Lowell, welcome to the forum.

    I have been at times quite frustrated during this process, but I think you have identified a market niche that needs to be filled. There have been some issues, but...
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    Poll: Bearcove, all the welds are fit up tight, and as...

    Bearcove, all the welds are fit up tight, and as I said, the contender appears fully penetrated. I couldn't say if the encore stub welds are more or less than .125", looking at them.



    I have...
  21. Replies
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    Poll: Yes, I recognize you are right. I've seen good...

    Yes, I recognize you are right. I've seen good structural welds... These dont bear a resemblance to the ones I've seen.

    That said, the contender upon inspection appears fully penetrated...
  22. Replies
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    6,209

    Forum: Cast Boolits

    I think shrinkage would be in the ballpark of...

    I think shrinkage would be in the ballpark of .982... So if your wax investment was around .360", your bullet diameter should be around .353". Might have to really crimp that in there, and dont...
  23. Replies
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    Poll: :) I think the welds in the picture...

    :)

    I think the welds in the picture probably look worse than they are on the front side, but it certainly isn't what I'm used to seeing on high pressure pipe welds (nice even uniform bead, good...
  24. Replies
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    6,209

    Forum: Cast Boolits

    I'm confused. Why wouldn't you just make a wax...

    I'm confused. Why wouldn't you just make a wax investment with your mold a la gloobit? If you took them a copper bullet they're not going to be able to melt that out of the mold.

    I would suspect...
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    Thats some nice work, much more so for a...

    Thats some nice work, much more so for a prototype!
Results 1 to 25 of 569
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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