Koolkustomer
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I was able to purchase a thousand of these from RMR but I cannot figure out what they are, therefore I cannot find load data for them, does anybody recognize them?
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.50 Cal 275 Grain Premium Bonded Hollow Point Bullets
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Koolkustomer
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They say that they're for if 50ae but they had a cannelure added to make them compatible with 500 Smith & Wesson Magnum
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Koolkustomer
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500 S&W Mag. They stated that they were not contractually allowed to identify the maker but that they were popular and should be easily identified. I'm not finding that to be the case
Hodgdon's online data shows quite a bit for a jacketed 275 gr bullet in .500 S&W Mag. That would be a good place to start.
Vihtavuori has some 300 Gr data that should be safe to use.
The Western Powders 6.0 PDF has some 275 and 300 Gr data.
Vihtavuori has some 300 Gr data that should be safe to use.
The Western Powders 6.0 PDF has some 275 and 300 Gr data.
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Koolkustomer
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Yes I've seen this data I was just hoping that somebody could recognize this bullet because pressures can vary greatly from different bullets of the same weight. This particular bullet seems that it will seat quite shallow and therefore increasing the case volume which with powders like H110, 296 and the Vihtavuori strain that can be very sensitive. Being so light and well made being bonded, I was hoping to push this bullet well up into the 2000s
It will vary a little, but not greatly between the same type of bullet.
This 300 Gr bullet is the closest thing I found. They sure are proud of them.
Sure look like Gold Dots. Maybe a special run for someone? If you can find some 275 or 300 Gr GD data in .500 S&W that should be an excellent start.
I think 2000 FPS is a little optimistic.
This 300 Gr bullet is the closest thing I found. They sure are proud of them.
Sure look like Gold Dots. Maybe a special run for someone? If you can find some 275 or 300 Gr GD data in .500 S&W that should be an excellent start.
I think 2000 FPS is a little optimistic.
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Koolkustomer
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Thank you very much for the help, I got these for about $.25 ea and if I could find out what they are and research them a little, I would probably buy a lifetime supply. I'm thinking about buying a Big Horn lever action to pair with my Revolver.
someguy2800
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They look just like Speer gold dots
edwardware
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No, not really. Certainly no more pressure variation than you'd see between min to max chamber, throat, leade, B-C gap, and bore/groove dimensions. Jumping to a unjacketed bullet could be significant (lower) and copper solids are hugely different (higher). Cup and core bullets of the same weight will show pressure variation within the noise of all the other variables you need to consider when taking Manual data and working it up in your weapon.
Start mid-way, work up, watch primers, and video a gel test if you can!
someguy2800
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I have seen huge differences in pressure and velocity between jacketed bullets of the same weight in 357 with all else being the same. In my gun a speer 158 gold dot takes a grain and a half more of 2400 to reach the same velocity and primer flattening as a 158 sierra. Using the powder charge worked up with the sierra, the speer will shoot 150 fps slower in a 4" barrel when loaded at the same sitting.
Yep, different type bullets, one is a cup and core and the other is plated, heavy plated, but plated, and all the gold dot data is different from standard cup and core data.
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Koolkustomer
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Every bit of the Hodgdon load data for 500 S&W Mag 275 gr is for Barnes lead-free copper bullets and I believe that the bullets I have are Speer Gold Dot heavy plated bullets but I can't verify that, which will require a quite different load. Also at 50,000 to 55,000 pressures I don't trust that the large rifle primers will telltale the pressure safely.
Smart fellow.
Coveter
Member
Trying to load these as well so I'm also trying to figure out the manufacturer and the ammunition type these projectiles were specifically engineered for to maybe give me a better understanding of how I can utilize them safely and more efficiently. They are the spitting image of a Speer Gold Dot, I would assume they are Speer but that gets me nowhere safely. I cannot seem to find any loaded ammunition that even closely resembles this weight and type of projectile. Can't find any information from ATK either. Guess it's time to start making some phone calls....
CraigC
Sixgun Nut
Looks like a Gold Dot. Are you sure it's not a 300gr? I find no reference to a 275gr but it could be a .50GI bullet.
Forget about reading primers in a straightwall revolver cartridge or any other traditional "pressure sign". They only pertain to bottlenecked rifle cartridges. Trust your data, verify with a chronograph.
Forget about reading primers in a straightwall revolver cartridge or any other traditional "pressure sign". They only pertain to bottlenecked rifle cartridges. Trust your data, verify with a chronograph.
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captain awesome
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I have noticed othera saying the same thing lately. other than sticky case extraction what are we looking for without having a chronograph anymore?
CraigC
Sixgun Nut
There are no reliable signs. You can see zero signs right up until it blows up. Most so-called pressure signs people are seeing have other causes are or completely benign.
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Koolkustomer
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I haven't started loading these yet so please keep this thread active if you find any answers, I have been able to verify that they are a discontinued 275 Speer Gold Dot for the 50 AE with an added cannelure.
It's because it was an auto bullet, and they added the cannelure after not using them fr the intended purpose. I assume to make them more appealing to the consumer, useful for revolver as well as auto, and yes, it's a compromise to be noted when loading.
Yes, the cannelure was clearly added as an attempt to repurpose the bullets, and not necessarily by the original manufacturer.
Considering how little of the bullet would end up in the 500 SW case, you'd want to do some testing to see if they are going to back out even with a tight crimp. And by that I mean as tight as prudent on a *plated* bullet. Some manufacturers actually recommend taper crimp instead of roll on plated bullets. Unfortunately, a taper crimp won't help hold the bullet in the case. Maybe that's the reason they got wholesaled off or scrapped in the first place.
Another thing that comes to mind is the effect of this cannelure on the bond between the plated copper layer and the lead core if the cannelure was impressed after the bullet was plated. These might peel when fired, especially if you roll crimp them.
I doubt these bullets are suitable for use in 500SW revolver cartridges.
Considering how little of the bullet would end up in the 500 SW case, you'd want to do some testing to see if they are going to back out even with a tight crimp. And by that I mean as tight as prudent on a *plated* bullet. Some manufacturers actually recommend taper crimp instead of roll on plated bullets. Unfortunately, a taper crimp won't help hold the bullet in the case. Maybe that's the reason they got wholesaled off or scrapped in the first place.
Another thing that comes to mind is the effect of this cannelure on the bond between the plated copper layer and the lead core if the cannelure was impressed after the bullet was plated. These might peel when fired, especially if you roll crimp them.
I doubt these bullets are suitable for use in 500SW revolver cartridges.
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Koolkustomer
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Well at this point since no one smarter than me has come up with anything I think I'm going to try caseload of Trail Boss or Tin star. I've been working on 327 Magnum and 6.5 Creedmoor for a while but it's time to get back on this project. I'm also beginning to think that #9 load data for a similar bullet in 300 grains wood work.
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