RotoMetals2RepackboxInline FabricationMidSouth Shooters Supply
Graf & SonsLee PrecisionTitan ReloadingWideners

Page 3 of 3 FirstFirst 123
Results 41 to 51 of 51

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
    Location
    Springfield, Oregon
    Posts
    2,876
    Quote Originally Posted by Nrut View Post
    Perfect..
    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 Master


    Join Date
    Feb 2018
    Posts
    766
    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 can’t say from experience, because I haven’t 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. It’s 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
    Location
    Lake Havasu City, Arizona
    Posts
    16,917
    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
    http://noebulletmolds.com/NV/product...roducts_id=915
    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. 

Name:	001 (3).jpg 
Views:	13 
Size:	45.2 KB 
ID:	230411

    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

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

  4. #44
    Boolit Buddy
    Join Date
    Sep 2017
    Posts
    448
    Quote Originally Posted by Larry Gibson View Post
    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. 

Name:	001 (3).jpg 
Views:	13 
Size:	45.2 KB 
ID:	230411

    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.
    Looks like time to do some measuring and calculations as to were things actually are before I start shooting. I have some time to think about it anyway.

  5. #45
    Boolit Master
    Join Date
    Apr 2017
    Location
    Minnesota
    Posts
    1,308
    Something about that just seems fishy. If the bullet is a proper size, how would it be gas cut just because the gas check is blow the neck? Pressure would be very low at that point. i'm not aware of anyone using non-crimp gas checks anymore. I've been doing some research, and mtngun of Mountain Molds regularly shoots with gas check below the neck. He is shooting every bit as good as I'm seeing here, maybe better. Not to call anyone out, it just seems that people are finding success in completely different ways, which is so often the case in cast bullets.

  6. #46
    Boolit Master


    Join Date
    Feb 2018
    Posts
    766
    It seems to me, that if the GC is below the neck, the hot gases are going to be past the CC, that is supposed to seal them off, before the boolit begins to move. The GC may not even stay on.

  7. #47
    Boolit Master
    Join Date
    Apr 2017
    Location
    Minnesota
    Posts
    1,308
    Quote Originally Posted by GregLaROCHE View Post
    It seems to me, that if the GC is below the neck, the hot gases are going to be past the CC, that is supposed to seal them off, before the boolit begins to move. The GC may not even stay on.
    And yet, there is the rest of the bullet in the neck, no different than a plain base. I'm willing to bet pressure and velocity is extremely low while the bullet is still in the neck. Why wouldn't a crimped on gas check stay on?

  8. #48
    Boolit Master waco's Avatar
    Join Date
    Jan 2009
    Location
    Springfield, Oregon
    Posts
    2,876
    Almost any 300 blk Load is seated way below the neck.
    Same on a 300 Savage.
    The fear of the Lord is the beginning of knowledge: but fools despise wisdom and instruction.
    Proverbs 1:7

  9. #49
    Boolit Grand Master


    Larry Gibson's Avatar
    Join Date
    Jul 2005
    Location
    Lake Havasu City, Arizona
    Posts
    16,917
    Quote Originally Posted by GregLaROCHE View Post
    It seems to me, that if the GC is below the neck, the hot gases are going to be past the CC, that is supposed to seal them off, before the boolit begins to move. The GC may not even stay on.
    That is correct. The hot gases can erode the bullet in some instances such as the NRA CB Supplement photo demonstrate. As stated earlier how much occurs and whether it has any discernible effect on accuracy depends on many variables. Fact of the matter is I know of no CB bench rest shooters who seat GCs below the neck. If your rifle/load is 2-4 moa capable or you're shooting at close range then the adverse affect probably isn't discernible either, unless leading is a problem.

    Crimp on GCs, if seated and crimped correctly, probably won't come off. It's the older non-crimp on slip fit GCs or the now home made thin non-crimp on GCs that pose the problem of coming off inside the case, particularly those that are a loose fit to begin with.
    Larry Gibson

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

  10. #50
    Boolit Buddy
    Join Date
    Oct 2017
    Location
    Va. mnts
    Posts
    230
    Nice job Waco! I regularly shoot high velocity out of tight twist barrels. My '06 CDL is a tackdriver @2800. Would love to shoot some steel at 500 but,don't have a convenient range.

  11. #51
    Boolit Master


    Join Date
    Feb 2018
    Posts
    766
    When a crimped on GC is referred to, it’s the type we normally buy or make and it is seated and crimped in place while the boolit is being sized. Right? I haven’t missed something where a GC is crimped on like factory crimp die crimps the case to the boolit?

Page 3 of 3 FirstFirst 123

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
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