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Thread: 1:10 twist .308 cast @ 2605fps at 500 yards sub 2 MOA five shot group.

  1. #41
    Boolit Master waco's Avatar
    Join Date
    Jan 2009
    Springfield, Oregon
    Quote Originally Posted by Nrut View Post
    Will be ordering one of these molds next month, Merry Christmas to me, lol..
    And thanks for your reply..
    You are welcome.
    The fear of the Lord is the beginning of knowledge: but fools despise wisdom and instruction.
    Proverbs 1:7

  2. #42
    Boolit Buddy
    Join Date
    Feb 2018
    Quote Originally Posted by megasupermagnum View Post
    It's all theory, but if the limiting factor with the velocity of cast bullets is the alloys ability to hold rifling, I would think a bullet that is all bearing surface would hold the best. Maybe not. I now want to try some higher velocity bullets in my 308 Winchester 1:10" twist. I'll see how far the Lee 309-170-F will hold up. I was thinking a 200 grain bullet with just enough lube, all bearing surface, and a very short nose should be the best you will get. I've got one drawn up. I don't understand why the Loverin designs have the tiny drive bands, especially since so many recommend only filling half with lube. I would think 3 small lube grooves, with hefty driving bands would be a better way.
    I canít say from experience, because I havenít tried it, but I have heard a lot about the difference between of boolits being hard and tough. I have had hard boolits come apart on me, so have tried to find out as much as it can on the subject. Itís been said that adding a little copper to the alloy makes it tougher and more able to stand up to the rifling with high speed boolits.

  3. #43
    Boolit Grand Master

    Larry Gibson's Avatar
    Join Date
    Jul 2005
    Lake Havasu City, Arizona
    Quote Originally Posted by 44Blam View Post
    Interesting. I was looking at NOE's site and they show "how to seat" this boolit and it has the GC in past the neck and a COL of 2.629". I have a different mold that is the 311-174-FN-AQ5 and I size to .311. I've only made dummy boolits so far to test the fit/function in my rifle and I found that if I seat it at a COL of 2.7" then about 0.07" of the boolit is past the neck and the boolit is about 0.005-0.01" from touching the lands - too close to measure with my calipers. But this is how NOE shows how to seat the 30 CXB...

    These things are interesting... A little bit here and there makes things work or NOT work. I cannot wait to load and shoot my boolits.

    Thanks again for the inspiration!

    Attachment 230401
    Note that the top of the GC is still in/at the base of the case neck. That is the proper max seating depth. Injury to the bullet from gas cutting can occur causing leading and inaccuracy. Non-crimp on GCs could also be scraped off by the case neck base causing further problems. These problems don't always occur as a lot depends on the alloy used, powder used and the intensity of the load. In the NRA Cast Bullet Supplement there is an example of what can happen to the bullet if seated too deep into the case;

    Click image for larger version. 

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    The bullet on the left had the GC seated still in the neck. The bullet on the right was seated with the GC below the neck.
    Larry Gibson

    ďDeficient observation is merely a form of ignorance and responsible for the many morbid notions and foolish ideas prevailing.Ē
    ― Nikola Tesla

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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