Modified 240 MK
 

I took .075 off the tip of a 240 MK and cut an x pattern in the hollow point of the tip. The cut was just to the lead. The jacket went 4 inches in and stopped. The core(177 gr) penetrated 18 inches of wet news print where it exited and went 5 inches into the back stop. The core turned into a U shape almost immediately. 1070 fps.

waste of time
 

why waste your time making a dumb dumb bullet your acc. is gone you cant insure you do the same thing twice. just buy a soft point

I say cool :smile:

This was a proof of concept bullet. If it would have had a bonded core I think it would have worked great. The hollow point itself was small and by its self only produces stress fractures along the tip. With the jacket pre cut it peeled back like a high velocity bullet. I am contemplating spending the money to build a bullet that will expand reliable every time unless I can get a manufacturer to do it. I think it is wise to experiment, don't you? If you are using a 230-250 gr soft point that expands 1.5 times it's original size let us know. Now I know if I build a bonded core bullet with a .020 jacket that has been serrated it will do what I want it to do. By the way the jacket went 1.45 times it's original size. I think it's cool too

How did you make the cuts? I'd like to duplicate your experiment and test for penetration v/s deformation.

I used a dremel with the finest blade I could find to do the initial cut and then the X cut. I then cleaned the tip and loaded the bullet. I have a hollow pointing tool that I made from a RCBS flash hole deburring tool. I just turned it down to fit my Forster trimmer. I used it to finish off the tip and give the jacket a funnel effect. I did not get into the lead. If you would like, I will post some pics.

please do, especially of the modified tool.

Let me know how it goes. I did this as a quick test and thought the results where interesting. If you used a meplat trimmer and the hollow point tool, the bullets would still be just as accurate, but you need a better way to do the cuts. As far as the core jacket separation I think a cannelure making tool could help, but separation might not be a bad thing.

Alleycat - If you get it to working,are they up for sale? Sounds like you are on the right track...Contacted The Bullet Depot, 541-826-2999, They use to make a heavy bullet exactly what you ( we ) are wanting, but the fellow quit. So he sent another one to train at Corbin. He got back and said he didn't have enough time to do it. Supposed to let me know if he gets them back in production......

I'm ordering a press and dies from Corbin on Monday. I was just seeing what had to be done to get some expansion with MK jackets. What I am planning on trying first is something like a Hawk 250 shape with a 1/4 length 4 quadrant core and a fully serrated jacket. I think it will be easier to get this simple shape to work. The question is if it has a boat tail or flat base. I'm having trouble making up my mind. Once I get a design that works I would be more than happy to sell some. Its just too bad we don't have more hogs to test them on. It will take some time for Corbin to make and ship the supplies and I will have to test everything. If anyone has a suggestion before Monday let me know. Hopefully I can make enough for those of you who would like to hunt with this type of bullet.