Suggestions needed for a HP CB for 44 mag

[KVO]

The same drill bit was used for this boolit as for the drilled #503, but the cavity was cut deeper, all the way to the full diameter of the meplat. The drill point was modified to a 90 degree included angle.

[KVO]

In regards to the note above about swaging the HP cavity with a Torx bit (really more like skiving), here are some examples that better illustrate the idea.
While not a .44, these are the best pictures I have at the moment. This is the NOE clone of the Lyman 358-156 with the deep HP. Rounds on the right are as-cast. Same media, both shot from a snub S&W model 19 & 5.0gr of Unique. The as-cast HP for that mold will mostly stay together with warm magnum loads from a shorter barrel, and as seen doesn't expand much at typical .38 special velocities. The point being, small alterations in the cavity geometry can have a large change in the terminal effect. I have a small tupperware full of boolits that either hardly opened or blew the noses off due to poorly matched HP geometry vs velocity.

[KVO]

W.R. Buchanan,

I tried some of the #503s as solids, cast from 20:1 with a max load of H110. I placed several wadded up towels behind the gel blocks; I figured the boolits would decelerate enough to at least be caught a 'la catcher's mitt and pull the towels sailing down range. Quite evidently I was wrong. Two shots zipped straight through 32" of gel and poked a drill bit hole through all the towels on the back end. Barely even moved them. If they smooshed open any I guess I'll never know. Next time I'll put a sheet of card stock or poster board behind the setup so there's a measurable hole that is larger than caliber size.

[nagantguy]

KVO those are great looking boolits and this is very interesting testing and reporting you are doing thank you for sharing it with us! I will be doing some similar testing with various hollow points in 38, 357 and 347 max soon as I get the final group buy mold and have a day or so off work!! Again your testing and record keeping and photos are very informative and worth while!

[bwelch]

Results from the latest test batch. Test platform is a .44 Magnum 7.5" Ruger Super Blackhawk Hunter, unless otherwise noted. Test media is Clear Ballistics gel with x2 layers of cloth folded over the front of the blocks for each shot. All shots were chronographed, and the listed velocity is either the average for the load for that string, or the velocity of that exact projectile when fired. Unless specified, alloy is RotoMetals 20:1. Two primary loads were used, either 18.0gr of Alliant 2400 for a middle range .44 magnum load, or 23.0gr of H110. All projectiles were powder coated.

My goal is to compare and contrast relative expansion vs. penetration at different velocity levels. Given that velocity variations with ES, barrel length, and even between barrels of the same length exist, I am not listing load data for each test, only velocity.

The candidates:
Attachment 221828
Attachment 221829

Where can I get the Large HP like in the pic?

[KVO]

GT Bullets appears to catalog a large HP version of the #503, possibly the NOE version because the cavity looks a little larger than the Mihec large pins in mine:

http://www.gtbullets.com/index.php?m...products_id=49

Different alloy than my testing, but would be a good sample source before you buy a mold. Looks like he has many NOE and Mihec molds offerings.