I'm going to play Captain Obvious here.
You have shown us a picture of the problem. That's the end point.
The solution is not in the picture.(probably)
The solution,the root cause,is upstream of the problem.
We TFL members can guess at every possibility and send you on many trips through the bushes.
Much better that you use an organized troubleshooting process to find the problem. Assume nothing is good. Verify .
Do you have calipers?
I have no idea what dies you have. Its possible to buy used dies that are worn out or have been altered.Its possible to buy body dies that do nothing to the neck. I'm not going to chase all the possibilities.
Is the neck getting sized down ?
You can pass/fail that. If not..
Do what you need to do to ensure you can re-assemble your sizing die correctly. Remove the spindle from the die. Use the die body only.
Take a piece of unsized brass. Measure it. Neck diameter.
Lube your case. Size it. Measure it again. Did the neck get smaller? How much? Will a bullet enter the sized neck with your fingers? What does the neck ID measure(as well as you can measure with calipers)
Remember sizing the neck is a two part process. The neck is sized down undersize,by the sizing die body. Then back up by the expander ball on the spindle. We eliminated the variable of the spindle for now. We just want to find out if the die body is doing its job.
Its a pass/fail. Is the die body sizing the ID of the neck down to around .221 or less? Yes/No?
Now you know .
Measure the bullet OD. Assume nothing. Is it .224? Pass/Fail.
Now. If the neck has been verified sized down enough,evaluate if the expander ball is too big. Note: When you re-assemble,careful to center the spindle again,so you don't bend decap pins. Tighten the spindle lock collar with a piece of lubed brass up in the die,top of stroke,punch in the flash hole.
Etc.
But then you may have a collet type die...You might need to get more squeeze.
I don't have any collet dies yet.
Apply a one variable at a time check list of the reloading process.
If you do not know or understand the process,with all due respect,you are step one in the root cause trouble shooting chart.
Once you know the process,its simple to check it one step at a time.
That will be the straight line to solving the problem.
FWIW,a glance at the appearance of the neck does not show me the "tracks" of being sized down. That's good for suspicion. Verify with measurement.
It also may be possible that your frangible bullets need to be seated to depth "X" and that's fine,but depth "X" may be wrong for your 62 gr penetrators. Might you just be seating the 62 gr bullets too deep?
No disrespect intended,but I'm walking my talk. Assume nothing,check the process one step at a time.
