I am looking to have a new barrel for my Savage made up. I have standardized on reloading the 308win. What I am looking for is the reason for the use of what angle on the leade and the freebore. What makes one better or worse than an other.
Also, a parallel or a tapered freebore?
I am looking to run my cast no faster than 2300fps MAX. I am going to use either a 1-12” or a 1-13” twist barrel. With a 0.300"x0.308” blank.
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For factory 30 caliber rifles with shorter and larger diameter leades, you could paper patch just the bottom section of this .301-.303 diameter PP bullet. This would make the PP bullet a long bore rider. Lap the throat rifling .0005-.001 larger for easier chambering.
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Here is one with more grease grooves. .400 long free bore.
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I keep thinking that a bullet with no taper would work best. All that is required is a throater and simple full length RCBS or Lyman sizer (sizing nose first). The snug fit and taper in throat would center the bullet.
This PP design is so much more simpler and grease grooves are plenty. The shorter pointed nose would not slump or slump less under pressure. All NOE would have to do is make larger diameter.
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I put it on the discussion section of the NOE Forum.
Frank
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Very interesting. Could this mold be available for sale.
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This is my idea of a good HV bullet that would only take about 1/8” forward movement to BS it in a .309 x .200 freebore. it would also work well fixed. Frank
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What is your purpose of having .023 wide by .0055 deep lube groves?
Frank
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What about this one? Can Veral of LBT cut somthing like this. Would the long nose slump when fired? Maybe nose needs to be a tad shorter
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I believe that the above mold is a PP design that you've changed the band diameters on?
The lube grooves are to small and I believe leading would/could be a issue. The low weight and short ogive doesn't give it a very good BC for 200 yd shooting.
I don't like trucated noses but, they hold a lot of records in CBA. I have a SAECO mold of that design (170 gr)but, can't bring myself to shoot them because of the low BC.
With lighter rifles like Production and Hunter, rcoil can become a issue with bullets over 170 gr and 2000 fps, also.
Frank
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Better than this one? Just trying something different than tapered LBT designs.
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Although it has the BC of a barn door, that is a lot better design than the others you've posted.
Frank
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Here is the bullet for my Ardito project. Free bore will be cut longer than .090. Linotype bullets fall from this mold @ .3105 diameter. Very close to what I requested.
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I have the various 30 caliber diameter reamer pilot bushings. I also have a PTG throater on order for a different Ardito bullet project, but it is a .310 diameter with .75 degree per side taper. I wonder if .310 free bore would be too large for the longer throat project bullet. I was surprised to see that my short chambered Shilen barrel and my Thompson Contendor barrel accepted the larger .3008 diameter reamer pilot at muzzle end of barrel. My factory Remington 308 barrel accepted the smaller .3002 pilot bushing at muzzle end.
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Kind of like this old design. Should work good with 3 groove Obermeyer rifling or any other style including 6 groove.
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And what would you use these for?
To shoot in my rifle...just kidding. Higher Velocity with cast, less bullet slump, longer bearing surface. The longer leade cut in chamber would give better support. When chambered the bullet will be jammed into rifling. The gentle 1 degree taper per side would do the sizing when bullet is launched.
I went back and checked measurements (close enough). What do you guys think? I know the tip is not pointed enough, but it is the best Accurate molds can do. I have no ballistics software.
I may have two different diameters cut (.309, .310) in aluminum double cavity mold
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fit like a morse taper ... hmmm .
always brings to mind a bullet in throat, totally locked in a perfect tapered position, ready for a perfect launch ... but i then ( years pass ) wondered just how much different throat angles support how much of the bullet. so i inculcated ::
for a groove depth of 0.004 ( one side ) here are the lengths engraved:
1/8 degree per side: 1.83 inches 1/4>>>>o.92 1/2>>>>o.46 3/4>>>>o.31 1>>>>>>o.23 2>>>>>>o.11 3>>>>>>o.08
ok, let's see ... i got a 1 inch long bullet ... 0.1 in the case ...0.1 freebore groove diameter ... 0.2 nose cone unsupported ... leaves me with 0.6 bullet to support in tapered chamber ... i need no more than 0.5 degree one side taper.
aaarrgh ... anybody wanna buy my perfectly good 3 degree throater ...0.313 to 0.297 ptg reamer ? i think i need to reorder ..wonder if a 1/8 degree would help breech seat ? no wonder we need long bore rider designs ... our 3 degree factory tapers combined with a 0.004 oversize freebore ...equals perpetual 3 moa groups. just what i shoot !!
oh wait ... Ardito told us that 20 years ago ...
ken
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