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#5616578 - 02/23/15 08:20 PM Hornady Press - cam over???
Korean Redneck Offline


Registered: 06/24/09
Posts: 2277
Loc: Houston
I have a basic Hornady lock n load press kit. It says in the manual not to "cam over."
What exactly does that term mean?

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#5616616 - 02/23/15 08:32 PM Re: Hornady Press - cam over??? [Re: Korean Redneck]
FiremanJG Offline
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Registered: 12/16/08
Posts: 17893
Loc: Wolfe City, TX
Run the ram up until the shell holder touches the die, and you pull the handle farther applying more force. Taking any slack out of all the metal in the press and die. If that makes sense.
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#5616667 - 02/23/15 08:51 PM Re: Hornady Press - cam over??? [Re: Korean Redneck]
RiverRider Online   content
THF Trophy Hunter

Registered: 11/11/07
Posts: 6227
Loc: Wise Co.
When you lower the handle and the ram rises, there is a point at the end of the stroke where the ram actually begins to lower again, kind of like a piston in an engine reaching top dead center and that moment it goes past it. You can adjust your die so that the shellholder *just kisses* it, or you can lower the die a bit more so that you'll actually strain the press's frame a bit in order to lower the handle completely all the way down. When you do that, it's "cam over."
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Originally Posted By: Cleric
God I am hating caliber threads more and more

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#5617117 - 02/24/15 08:05 AM Re: Hornady Press - cam over??? [Re: Korean Redneck]
Korean Redneck Offline


Registered: 06/24/09
Posts: 2277
Loc: Houston
So basically, I need to find out what the highest point of the ram is and set everything according to that.
is that correct?

Also while on the topic, some people say with the resizing die to touch the shell holder, lower the ram a bit and then do an extra 1/8 to 1/4 turn. is that necessary?

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#5617143 - 02/24/15 08:17 AM Re: Hornady Press - cam over??? [Re: Korean Redneck]
redchevy Offline
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Registered: 10/25/04
Posts: 23463
Loc: Texas
Many people who don't lower the ram and add the extra 1/8-1/4 turn will eventually have problems with the bolt not wanting to close because they are not completely sizing the rounds.

I had that problem. With mine you could still close the bolt, it was just very stiff.
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#5617169 - 02/24/15 08:31 AM Re: Hornady Press - cam over??? [Re: Korean Redneck]
FiremanJG Offline
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Registered: 12/16/08
Posts: 17893
Loc: Wolfe City, TX
That's for amateurs. Get the Hornady Headspace gauge kit that attaches to your calipers, and set your FL die to bump the shoulder .003" from the fired length. It yields more velocity out of your brass, makes the brass last longer since it is not over worked, and the bolt will close and open before and after firing, respectively.
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#5617285 - 02/24/15 09:02 AM Re: Hornady Press - cam over??? [Re: FiremanJG]
NTRP Offline


Registered: 02/06/09
Posts: 1421
Loc: McKinney, TX By God!
Originally Posted By: FiremanJG
That's for amateurs. Get the Hornady Headspace gauge kit that attaches to your calipers, and set your FL die to bump the shoulder .003" from the fired length. It yields more velocity out of your brass, makes the brass last longer since it is not over worked, and the bolt will close and open before and after firing, respectively.


Bumping more than .002 will cause case head separations.
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#5617301 - 02/24/15 09:11 AM Re: Hornady Press - cam over??? [Re: NTRP]
dee Online   content
Extreme Tracker

Registered: 04/10/10
Posts: 4665
Loc: Red River way
Originally Posted By: NTRP
Originally Posted By: FiremanJG
That's for amateurs. Get the Hornady Headspace gauge kit that attaches to your calipers, and set your FL die to bump the shoulder .003" from the fired length. It yields more velocity out of your brass, makes the brass last longer since it is not over worked, and the bolt will close and open before and after firing, respectively.


Bumping more than .002 will cause case head separations.


.002 is what I do and usually requires a cam over of the press.
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#5617347 - 02/24/15 09:41 AM Re: Hornady Press - cam over??? [Re: NTRP]
FiremanJG Offline
THF Celebrity

Registered: 12/16/08
Posts: 17893
Loc: Wolfe City, TX
I believe you, of course. Hasnt happened to me yet. I've been using turret press for several years, and have had a tough time getting exactly .002", so if was .002"-.003" I was fine with it.

But yesterday I mounted a Co-Ax to the bench and expect some issues to go away.
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#5617498 - 02/24/15 11:02 AM Re: Hornady Press - cam over??? [Re: Korean Redneck]
RiverRider Online   content
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Registered: 11/11/07
Posts: 6227
Loc: Wise Co.
There are varying degrees of cam-over. If you have to apply 50 pounds of force to the press handle, you're going to break or at least prematurely wear something out. Mild cam-over may be all that's required for best resizing.

Measuring to set up shoulder bump has its weaknesses. If the shoulder angle cut in your chamber differs from the shoulder angle cut in your sizing die at all, you're going to have some issues---not that they can't be resolved, but you need to understand what's going on. IIRC, you're an engineer (mechanical, wasn't it?) so you should have no trouble comprehending that. You CAN set up your sizing die to bump the shoulder by feel, but to be effective you have to realize that turning your die into or out of the press just 5 degrees will affect the "bump" by 0.001 inch. I can see where measuring could be very helpful in keeping track of where you are while getting the adjustment just right, though.

If you go strictly by measuring a fired case and setting your die accordingly, you could be leaving some precision and case life on the table.

JG, have you ever let your sizing die out one or two thousandths and then sized a case and checked it for the feel of closing the bolt on it?
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Originally Posted By: Cleric
God I am hating caliber threads more and more

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#5617532 - 02/24/15 11:25 AM Re: Hornady Press - cam over??? [Re: Korean Redneck]
Korean Redneck Offline


Registered: 06/24/09
Posts: 2277
Loc: Houston
That does bring about another question. How "hard" does the lever need to be pulled?
If my wife were hypothetically answering this question I would have to say to her how hard for who; you (a small 5'2" woman) or me (a 6' man).

Don't need to know ft-lbs but the best analogy I've heard is scope ring installation. If you don't have a torque wrench, then try and consistenly hand tighten the rings using just the short part of the L shaped wrench to prevent over-torquing.
I'm looking for that sort of description.

I've already bent and ruined the center, threaded shaft of a re-sizing die by pulling too hard. I though it need that much to removed the primer. I ended up just bending the shaft and cracking the insert that helps size the ID of you case opening.

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#5617575 - 02/24/15 11:42 AM Re: Hornady Press - cam over??? [Re: Korean Redneck]
RiverRider Online   content
THF Trophy Hunter

Registered: 11/11/07
Posts: 6227
Loc: Wise Co.
Originally Posted By: Korean Redneck


I've already bent and ruined the center, threaded shaft of a re-sizing die by pulling too hard. I though it need that much to removed the primer. I ended up just bending the shaft and cracking the insert that helps size the ID of you case opening.


When you initially set up your sizing die, back the depriming rod out of the die a good ways. You bent the deprime rod because if bottomed out in your case before the upstroke of the ram was completed.

I understand your statement to say that you bent the rod AND damaged the expander button. You should go ahead and just replace them both. If you're using RCBS or Hornady, customer service may be a little more sympathetic to your newby-ness and send you the parts for nothing. Other makers...maybe and maybe not.
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Originally Posted By: Cleric
God I am hating caliber threads more and more

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#5617599 - 02/24/15 11:56 AM Re: Hornady Press - cam over??? [Re: Korean Redneck]
Korean Redneck Offline


Registered: 06/24/09
Posts: 2277
Loc: Houston
I came to the same conclusion as your suggestion. I found a kit that had all the replacement parts.
Not that it really matters, but I have some experience commercial fab and machining. I know what messed up looks like and believe you me, i totally messed up the whole rod and everything attached to it.

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#5617606 - 02/24/15 12:00 PM Re: Hornady Press - cam over??? [Re: Korean Redneck]
RiverRider Online   content
THF Trophy Hunter

Registered: 11/11/07
Posts: 6227
Loc: Wise Co.
Good judgement arises out of experience and experience [often and unfortunately] arises out of bad judgement. Wish I had a nickel for everything I've ever buggered up!
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Originally Posted By: Cleric
God I am hating caliber threads more and more

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#5618009 - 02/24/15 03:37 PM Re: Hornady Press - cam over??? [Re: Korean Redneck]
Buzzsaw Offline
THF Trophy Hunter

Registered: 06/29/11
Posts: 5023
Loc: Frisco, Texas
KR, I'm getting tired head...I wish you were up here so you could sit with one of us and we could "show" you all these things you are asking about. They will make COMPLETE sense when you "see" it in person.

Don't over think it...........it's not that hard.......


Hey...let you sweet wife (woman) help.....she will figure it out... banana
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