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Which charging die for 7RUM (load master w/auto-disk)?

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Unread 05-20-2012, 11:14 AM
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Join Date: Feb 2012
Location: Remington County, PA
Posts: 385
Re: Which charging die for 7RUM (load master w/auto-disk)?

My auto-disk (pro) setup already allows for stacking of the disks without any sort of "conversion" required. But even if there WAS a problem with powder measurement, there is always the "adjustable powder charge bar" option for the auto-disk setup (it's only 10 bills), if I were to need it. I'm sure it's been designed to be compatible with the disks, in terms of stackability. This would allow for a pretty much infinite # of different (and very precise) charges to be measured out. The issue I currently seem to be having involves the dropping of the charge into the cases, after it has been measured. And since the powder I will be using is of the stick variety, I would REALLY like to have the proper die, along with the integral (but separate piece) drop-tube that goes with/inside of the die, to minimize the possibility of any powder getting hung up, and ending up being added to what is already going into the NEXT case. Obviously, the top of the die needs to be threaded on the inside to match the bottom (outside) threads of the thumbwheel on the auto-disk powder measure. I suppose that a die that does NOT use a separate drop-tube inside of it would still work, if that's the only kind that IS available for the 7RUM cartridge. But it does need to be able to funnel the powder down into the neck of the case, without the possibility of any getting hung up. The load master is not only THE only press that I have, but it is also the only one that I ever WANT to have! When I bought it (only a few years ago), it was with the intent that I would be using it for ANY rounds that I might want to load (short of .50BMG, anyways), so that I would never have to consider buying any more presses. I do have to agree, that due to it having to perform so many different operations with a single stroke of the ram, it does take some fiddling & tweaking to get it set it up for smooth, seamless operation. But so far for me, that has not been a problem. For safety reasons, I actually WOULD be looking for problems, with the most critical being those of the overcharged case variety. There is a commercially available die known as the "powder cop" (a hornady product) that is intended for the sole purpose of allowing for visual verification of the amount of charge in every case, by means of having a floating rod drop down into the charged case when the ram is brought all of the way up to the top of the stroke. Obviously, it needs to be placed between the powder charging die and the bullet seating die. The load master can accommodate this extra (4th) die, while STILL having the capacity for one more! But I am still not willing to put ALL of my faith in that alone. After I finish loading up a batch of cartridges, I ALWAYS perform a final weight check of EVERY round that was loaded. Any round that varies from the average by more than a certain amount (as determined by me, taking variations in brass weight into account), ESPECIALLY if the variation is on the over-weight side, gets pulled apart, and the powder charge that was in it is weighed.
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Unread 05-20-2012, 10:13 PM
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Join Date: May 2007
Location: Kodiak
Posts: 179
Re: Which charging die for 7RUM (load master w/auto-disk)?

Just linking thoughts.

Linking thoughts from just reading the "Throat erosion double base powder" thread and now this one.

The load you were shooting for is 96.5 of Reloader 25, behind a 120 ballistic tip. Now the goal is to load that on a lee progressive press?

Most of my experience with the 7 rum has been around retumbo, but my gut says thats on the upper end of recomended pressure. Several questions and observations come to mind.

What is the accuracy in grains the auto disc is capable of when throwing powder charges in that range with rl 25? (In my experience with a couple 7 rums, charge weight changes as high as 1 grain didn't do much to velocity but drastically altered accuracy.)

Do you feel comfortable with the ramifications of high pressure in the 7 rum? I.e. super low primer pocket life and neck failure? The brass for this critter can be short lived in the upper end of pressure. (max load in one 7 rum with a 120 b-tip had as low as 2x loads before 90% neck and primer failure... that load was lower pressure than your intended)

I love the 7 rum, am currently working on a 3rd. It just seems counter intuitive to have such a hotrod with such short barrel life loaded with a method more suited for high volume pistol. If you have a scale, maybe just use the progressive for other load stages and manually weight the powder.

Just a suggestion, hope its helpful.
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Unread 05-21-2012, 06:50 AM
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Join Date: Feb 2012
Location: Remington County, PA
Posts: 385
Re: Which charging die for 7RUM (load master w/auto-disk)?

It looks like that's what I'm going to have to do for now. According to my figures, stacking 4 disks (I don't even know if that would be possible) on the autodisk measure would still yield less than 85gr of RL25. When I read that it is "primarily" intended for pistol and smaller rifle cartridges, I over-exagerrated the meaning of the word. They should have used the word "only" instead.

But now I am seeing a potential problem with the "perfect" measure also. It will handle a large enough of a charge, but from the listing that I saw on ebay yesterday for a perfect-compatible rifle charging die, RUM cases won't fit. They state that the die will fit cases up to .520". The RUM case is .520" at the shoulder, but it tapers UP to .546" at the base. I wonder what other RUM loaders do about this situation.

And to make things clear about the 96.5gr of RL25 behind a 120, it was PM'd to me by another forum member. But the 120's that he was using were NOT nosler ballistic tips. He claimed 3950fps for that load, stating that the accuracy did go down if any higher charge than that is used. But, the "mileage" MAY vary with NBT120's. I suppose I'll find out when I get there. That is if the day ever comes that the 7mm shaw barrels from the group buy at gunshack ever get shipped out. From what I understand, they are experiencing "problems" right now.

Last edited by Max Heat; 05-21-2012 at 07:32 AM. Reason: added last scentence
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