The wire they sell to us is pretty much pure lead. What they use to make their own slugs is harder due to the automated process.
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How to Use a Corbin S Press - A Thread Geared Toward Beginners
- Thread starter Ezana4CE
- Start date
Actually, correction. I don't use a separate die for a core. I only have the one die that is the standard HP, 2S-ogive.
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I am using Corbin equipment and Corbin .210 wire to make .218 boatail hollow ogive HP slugs. So that is a two step process core first then point form. Mine are coming out great. One pass for the core then one pass for point form and they shoot great in my DRS. I am limited by the action opening and mag so they are only 35.5 gr. I would like to go a bit heavier. I have the same dies in .250 as well and they are also coming out great.
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@Ta-Ta Toothie The two-step process is what he is describing and is literally what I have demonstrated step-by-step in this thread. The only difference is that I used a different base and caliber.
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I understand this is a requirement for the hollow ogive, but I don't remember anything on Corbins site explaining this for the rbt. Either way, there is no shortcuts. With either method, it requires multiple steps and I will probably be ahead using the same die. I will though try out some .185.
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@Ta-Ta Toothie No one stated that this is a requirement for RBT slugs anywhere that I read. The man made a very specific statement.
That is the style slugs he elected to make. Where is he (or anyone else) saying you have to make boattails that way?
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@Ta-Ta Toothie Thanks for clearing up with reference to that post. To my understating you can have a core swaging die to adjust core weight that is not a hollow-ogive core forming die. Do you have a core swaging die in any caliber?
S-Press Core Swage Die and Punch
- Perfect for fine-tuning bullet cores - Achieve professional-level precision - Versatile tool for multiple bullet-making tasks - Backed by Corbin's industry reputation - Excellent long-term investment for bullet makers
www.corbins.com Last edited:
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I had Dave Corbin make me a shorter internal Core forming Punch..
So the cavity isn't as deep.....Haven't got a chance to play with it though....
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@Ta-Ta Toothie That clears up my confusion. The one-step process is simpler, but explains why you may need to rotate your slugs and press them multiple times. When forming cores with a base punch the base already gets a couple of presses. Then when the nose is formed it gets more so there is more pressure applied to the RBT base. so your four presses versus 2 on the core die and two on the point-forming die may be somewhat equal although I'm unsure how much pressure is actually being exerted upon base while the slug is in the point-forming die with a thin nose punch. Even better in @ndwind 's case because he's getting good results forming his base and slugs in two passes.
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I don't think there's any lack of presure, but air gets trapped on the 1st press. I don't fully compress the 1st round so there's some meat on the bone for the follow ups.
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@Ta-Ta Toothie I'm speaking of the pressure exerted upon the point-forming die used for hollow-ogive hollow-point slugs. Without looking at the hollow-ogive HP, point-forming punch next to the HP punch and have the difference explained by someone working at Corbin, it would have been tough for me to conceive. What I was told was that this die and punch close the opening at the tip of the hollow-ogive core around the pin forming the hollow-point opening of the hollow-ogive HP slug. The desired weight should've been achieved in the core-forming step. With that said, it seems logical that not much pressure is applied to the base with the bottom punch being finely adjusted allowing just enough space and pressure to form the nose of the projectile. If that's the case, I can't see a lot of force being exerted upon the base punch and RBT base of the slug. I could be wrong, but this is my thinking right now.
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Here is the Core forming Die with internal Punch..
Here is the relationship of the bleed hole to the tip of the punch...
What all this means.. as the core is formed, the lead is exiting the end f the core away from the Base.
So this means with the punch so deep into the core exerting mass amounts of force on the base ...
This what helps in the complete forming of the RBT Base....
Here is the relationship of the bleed hole to the tip of the punch...
What all this means.. as the core is formed, the lead is exiting the end f the core away from the Base.
So this means with the punch so deep into the core exerting mass amounts of force on the base ...
This what helps in the complete forming of the RBT Base....
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I love the Corbin stuff you can go realitvly simple or way over the edge involved! I have quite a varity of dies and punches for .218. So you can come up with lots of combinations to try. A base punch and simple hollow point are one step easy peazy. then you get into hollow ogive two step procsess core form then point form. Hollow ogive X punch now you have a tree step hollow ogive core form then Xpunch to segment the hollow ogive then point form to close and form the HP. I know sounds crazy but Holy Crap does that Xpunch hollow ogive HP make a Wicked round!
And here in eastern ND we have a lot of winter so messing around in my shop wich is on the main floor of the house keeps me from looking out the window and wiishing it was summer!!!
There is an indoor shooting range 6 miles from my house with 50 foot range and underground rifle tubes six lanes out to 100 meters. So I can make some up then go test how they shoot.
And here in eastern ND we have a lot of winter so messing around in my shop wich is on the main floor of the house keeps me from looking out the window and wiishing it was summer!!!
There is an indoor shooting range 6 miles from my house with 50 foot range and underground rifle tubes six lanes out to 100 meters. So I can make some up then go test how they shoot.Upvote 0
