Be Sure to visit the store to see whats new

Author Topic: 300 Blk Bullet for dummies (easy to cast, powder coat, and load bullet for subs)  (Read 3010 times)

Geargnasher

  • New Member
  • *
  • Posts: 29
  • Luber Goober
    • View Profile
Take the Lee 309-230-5R, straighten out the boat tail to a cylinder, make the body bands .309", and change the nose to a straight taper from the front band at a 3° included angle down to .298" diameter, then a secant ogive on to the point, which probably ought to be hemispherical.  No bore rider.  It has no choice but to fit no matter the coating thickness on the nose, just seat a few thousandths deeper if your coating is extra thick.

Also think about the .30 xcb bullet nose, something very much like that in fitment concept is what I'm suggesting, but with a more stretched out unsupported nose section and more length on the base end to get the weight up.  220 grains is going to be tough to get to fit as I'm describing, but if I have time this weekend I'll try to sketch something out.

Did my comments on microbands (displacement grooves, really) make sense?  Ths is a subsonic bullet operating at .45acp pressures or less, it needs very little bearing surface and if you want something versatile size-wise, it will need to be easy to size without excessive extrusion of the whole body portion. Breaking up the surface with tumble-lube grooves lets just the surface displace when sizing or firing it, rather than crunching all the dendrites in the body portion and drawing the bullet out lengthwise as is the case with a solid cylinder.
« Last Edit: July 14, 2018, 05:10:31 AM by Geargnasher »

cornmastah

  • Administrator
  • Hero Member
  • *****
  • Posts: 1378
  • Collector
    • View Profile
sorry, haven't had the time to draw up any changes.

Geargnasher

  • New Member
  • *
  • Posts: 29
  • Luber Goober
    • View Profile
My drawings are mostly done in crayon, the more technical ones done on the shop slab with soapstone (or in the driveway dust with a stick) so I'm  not much help.

cornmastah

  • Administrator
  • Hero Member
  • *****
  • Posts: 1378
  • Collector
    • View Profile
I added a small taper between the nose and the main driving band, decreased the bluntness of the round nose.  A gas check shank can be an option, but I'm not sure about putting in tumble lube grooves.  The bullet will lose weight or have to grow longer if we add the mini lube grooves.  I don't really want the bullet to be any lighter, and many people prefer the slick sides for easy casting.  Here is a quick updated drawing:



Thoughts?
« Last Edit: August 08, 2018, 02:56:57 AM by cornmastah »

SwedeNelson

  • Administrator
  • Hero Member
  • *****
  • Posts: 1744
  • Bullet maker, maker
    • View Profile
Something more to think about




Would want to start another buy for this one.


Bullet maker, maker
Al Nelson

cornmastah

  • Administrator
  • Hero Member
  • *****
  • Posts: 1378
  • Collector
    • View Profile
That looks good, I think we should do both options.

GregP42

  • Full Member
  • ***
  • Posts: 101
  • Lead thrower and .41 and .32-20 fan
    • View Profile
Something more to think about




Would want to start another buy for this one.


Bullet maker, maker
Al Nelson

Oooooo.... That's it!

Greg


AKFshrmn

  • New Member
  • *
  • Posts: 11
  • Noe Guest
    • View Profile
Both look like decent options, but I'm more interested in the HTC PB version. I'll most likely be shooting this suppressed, and I'm pretty leery of running GCs through the can.

Sheepdog86

  • New Member
  • *
  • Posts: 5
  • Noe Guest
    • View Profile
Never saw any movement on these in the group buy discussion. Is there still any interest. I have been waiting to purchase a 300 blk mold to start casting for my new sub gun.

cornmastah

  • Administrator
  • Hero Member
  • *****
  • Posts: 1378
  • Collector
    • View Profile
Yes, this bullet is probably going to skip the group buy phase and go into production.  Waiting for Al to catch up on current group buys, then should be able to get this mold cut.

Never saw any movement on these in the group buy discussion. Is there still any interest. I have been waiting to purchase a 300 blk mold to start casting for my new sub gun.

 



Castpics and Reloader's Reference