224 bullets

[Liseo]

Hi

I have a set of Blackmom steel dies who make very good 52 grains FB bullets, on par with Sierra and Berger.

Today adjusted the core weight to make 73 grains bullets on .930" J4 jackets.

But I noticed that the core dont slip down to the botton of jacket, staying at least .250" above .

My concern is that I will have air trapped under the core.

So,I am worrying for nothing or it would be better to use a smaller diameter core, allowing it to touch the jacket botton?


I need a BR quality bullets.

What you think?

**Excuse my bad english

[MIBULLETS]

Ideally, the core should go to the bottom, but you can try them and see. If the core pushes down into the jacket easily the air is coming out. If it feels spongy, then you have some air trapped. It may still come out when you seat the cores. It doesn't hurt to make a few and check the accuracy, so I would make some and shoot them. If it isn't satisfactory to you then you will need a smaller core.

[Liseo]

Thank you Sir.


I will change the core diameter, for peace of mind.

I asked this question on another fórum, but no much responses.

Who in states are making 30 caliber carbide dies, beside George Ulrich?

I tried contact him and Niemi by email, no luck.


Thanks and Merry Christmas

[Liseo]

The results for 73 grains bullets were horrible.

While with 52 grains FB I can do 1/4 groups frequently, the 73 grains averaged 1 inch. (1/9 twist krieger barrel)

But I have one question. This is the first time I made BT bullets, as I received the BT core seatig die recently.

The BT can be done straight with the BT core seating die or I need first seat the core in the FB die and then run it through the BT die?


I read somewhere that to make BT bullets add one operation to the process

[MIBULLETS]

You don't need to use the FB core seat die first. It will probably stress the jacket more doing so. I'm not sure but I would guess the BT die will increase the chance of trapping air with your tighter cores. I think you are right by switching cores size. Good luck!

Not sure on the carbide dies, I'm using steel dies.