Bullet weight question

[Ohio Rusty]

A Lyman 429-215 mould should drop a bullet at 215 grains including the gas check. If that same mould was hollowpointed, how much of a reduction of weight in grains would there be to the bullet ?? 10 grains?? 15 grains ??
Ohio Rusty ><>

[waco]

That's a question full of variables. Alloy, heat, ect....
But I would guess you are on the right track.
Waco

[Ohio Rusty]

There are only 2 alloy's I shoot for the .44. Straight WW's with a little tin, or 50/50 alloy pure lead/WW's.
Ohio Rusty ><>

[JonB_in_Glencoe]

I had a NOE 432-421 Keith RG2 with flat nose pins as well as HP pins.
The HP boolits were 14gr lighter than the boolits cast with the flat nose pins.
with that said,
I had a 1980s vintage Lyman 429-215 mold, according to my notes, it would drop a 222gr boolit as dropped using COWW alloy, that is not including a GC or lube.

[reddog81]

10 to 15 sounds about right. It depends on the size of the hollow point.

[Tom Myers]

A Lyman 429-215 mould should drop a bullet at 215 grains including the gas check. If that same mould was hollowpointed, how much of a reduction of weight in grains would there be to the bullet ?? 10 grains?? 15 grains ??
Ohio Rusty ><>

I used a photo of a Lyman 429125 HP mold to scale out the dimensions of the hollow point pin and then, using the newly released
Cast Bullet Design 5 ~ Advanced software (http://www.tmtpages.com/#advanced),
a new bullet design record for the 429125 with the hollow point added.

The Lyman 429125 is advertised to cast a 210 grain bullet from Lyman # 2 Alloy

Here are some images of the calculations using the Bullet Design software.

This is the image that I used to scale the pin dimension.

http://www.tmtpages.com/LinkSkyImages/forum_images/Lyman%20429215%20HP/Lyman%20429215%20HP%20Mold.PNG

A sketch of the bullet using wheel weight alloy without the hollow point pin.
The bullet without lube or gas check weighs 216 grains.

http://www.tmtpages.com/LinkSkyImages/forum_images/Lyman%20429215%20HP/Lyman%20429215-Sketch.PNG

A sketch of the bullet using wheel weight alloy with the hollow point pin.
The bullet without lube or gas check, weighs 199 grains. 17 grains difference.

http://www.tmtpages.com/LinkSkyImages/forum_images/Lyman%20429215%20HP/Lyman%20429215-HP-Sketch.PNG


This the data entry page with the hollow point pin dimensions, lube and gas check weights highlighted.

http://www.tmtpages.com/LinkSkyImages/forum_images/Lyman%20429215%20HP/Lyman%20429215-HP-Data.PNG

A page of the Bullet Design software that calculates the dimensions and weight of various bullet alloys for this HP design using wheelweight alloy

http://www.tmtpages.com/LinkSkyImages/forum_images/Lyman%20429215%20HP/Lyman%20429215-HP-Alloy-Weights.PNG

Another page showing the weights and dimensions of the design cast with Lyman #2 alloy and without the hollow point.

http://www.tmtpages.com/LinkSkyImages/forum_images/Lyman%20429215%20HP/Lyman%20429215-Lyman%232-Alloy-Weights.PNG

[Ohio Rusty]

Tom ... .That is absolutely the nicest computer programs I have seen !!! Totally awesome .....
And yes .. you found the HP mould I was talking about ...
Ohio Rusty ><>

[Tom Myers]

Ohio Rusty,

Thank you for the compliment.

For those who are interested, the long awaited, new, version 5 Precision Ballistics, Load Records and Firearm Records (http://www.tmtpages.com/) have also been released.

The Precision Ballistics thread in the Vendor Sponsor (http://castboolits.gunloads.com/forumdisplay.php?197-Precision-Shooting-Software) section contains more links.

Any questions or comments can be addressed from the Vendor Sponsor section.