311-137-RF-CA3 with HP option

CBCM1jones

Your request is an interesting one that may or may not require NOE to need new tooling … depending on what NOE wants to do… once this latest drought on product begins to look a bit brighter…

You should know that if it does require new tooling to manufacture the HP version… then you will apparently need at least 9 more individuals who also will need to request this mould mod… for an HP version of said mould 311-137-RF-CA3

If the Original 311-137-RF-CA3 tooling can be utilized then you may only need at least 4 more individuals to also request this mould…  as all that will probably be required is the new HP pin design to be manufactured… However most probably the setup design program to produce the needed HP pins will need to be setup & manufactured…

To try to help you in this potential design endeavor I have attached to this posting several design sketches in an effort to try to describe to you want you are apparently requesting… Unfortunately the forum will not allow me to attach those marked up sketches to this reply

The first attachment is the NOE design sketch, followed by the modification sketch of an HP version for your and the other forum members consideration…

I have designed and had made a goodly number of HP moulds, and in doing so with various machine shops in doing the designs … one needs to basically take a couple of parameter details into account…

#1.  The meplat rim around the HP Meplat pin hole needs to be at least .025 in diameter thickness wall to get the mould design to fill out properly when casting …  that means if the meplat is .150 that the maximum large diameter on the HP cone needs to be ~. 100 or less max, if one wishes to not have issues with the HP rims completely filling out…

NOTE: The afore mentioned rim thickness is the minimum design wall thickness of the machine shops that regularly tend to consistently produce good product when casting… Looking at the NOE drawings dimensional sketches this appears to be ~ the same number that NOE is also using as a minimum wall thickness…

A greater amount of wall thickness is better … Your call on what you want to use as a minimum wall thickness in your design… request…

If the meplat is left at .150 as … currently shown with only the HP hold added one will only have ~ .100 left for the larger diameter cone at the nose of the bullet… Thus one is limited in the options of depth and minor diameter to maintain the needed HP cone design slope, which brings us to requirement #2 to make a mould that will tend to cast good product.

#2.  In order to get the cast bullets that do not tend to continually get stuck on the HP pins the slope on the pin from max to minimum cone diameter needs to have at least a 7 Degree slope …  anything less and one will tend to have the HP cast bullets regularly hanging up on the HP pins… as hanged product…

Leaving the .150 Meplat in tact …  combined with at least a 7 degree slope on the HP pin will only at best yield a very small HP pin producing an estimated ~ a 2 grain decrease in the finished cast bullet weight… before one starts to run into trouble with less than a 7 degree slope … basically allowing the HP pin to cool too fast to easily release the cast bullet from the HP pin… once the main portion of the cast lead has solidified… enough to allow one to cut the sprue and open the mould prior to the next filling…

Here is what I might suggest that you and your fellow members consider as a potential design path to consider…

A.  The 311-137-RF-CA3 bullet currently has an OAL of .730.  Some rough scaled sketch dimensional calculations indicate that leaving all the other dimensions as is… & intact … that reducing the cast bullets OAL to ~ .700 will potentially give one ~ a .200 meplat…

This will potentially allow NOE to utilize the standard NOE .200 diameter pins, & also potentially give the major diameter of the HP pin involved to be increased to ~ a .150 in diameter… which is much closer to what NOE is normally utilizing in this cast bullet diameter region… & still leave a .025 diameter thick wall thickness rim on the HP to help insure a complete fill when casting product.

This would potentially also allow the HP pin to be constructed as noted in the second attached drawing to reduce the cast bullet weight to ~ 129 Grains while still keeping a draft angle on the HP pin to have greater than a 7 degree slope.

Here is the link to the NOE store web page.  https://noebulletmolds.com/site/shop/308-311/311-137-rf-ca3/311-137-rf-ca3-4-cavity-pb/

This would have been represented by the second cast bullet marked up sketch that incorporates the aforementioned changes to potentially produce the desired change requested while taking into account what design parameter are needed to help produce good product…

NOTE it is interesting that the jpg attachments are apparently not being allowed by the forum software to be uploaded with the visual data as described above.

I will try again later to just attach the attachments to a subsequent posting to help illustrate visually what may possibly be the direction that you and the others may want to take to reach your requested goal of an HP version of this mould design, should your request it by posting on the NOE forum.

Your call on how you want to proceed…
Take Care, & Stay Safe…

I would definitely like to see this one run again.
I would try both the plane and GC versions.
Mike