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I've got a Sako AIII with a severely blown out throat, chambered in 280 Rem Imp. I was going to just rebarrel it to 280 AI, but the action on the AIII is 375 H&H length, not 30'06. So I just rechambered the original barrel in 280AI, but at the 375 H&H length. It was a bit of a pain to get the cases to form, but I managed to get there. Here's a pic of the Super Ackley (left) next to a standard 280 Ackley Imp. The Super Ackley case holds 84.1 grains of water. I've got a bunch of cases fire formed and ready to go, but haven't worked up any loads yet. It may be better just to neck it to 6.5 or 25cal instead and forget the about the long 280 since it probably won't out run a 7 Mag anyway. Tony Rumore Tromix Edited to add - The parent case is a 9.3x74R. [img] https://i.imgur.com/tCwy5yB.jpg?1[/img]
Last edited by TonyRumore; 06/27/21.
Run it up, until you blow it up, then back it down a bit.
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I just loaded up a few rounds with MagPro powder topped with the 120gr Barnes TTSX.
They flew 3450fps from the 25" barrel. Decent, but I don't think the juice is really worth the squeeze on this one.
I think necking the long Ackley case to 25 or 6mm will be a bit more interesting.
Tony
Run it up, until you blow it up, then back it down a bit.
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Nice, RL-33, Retumbo or H-50BMG should make 180-195gr Bergers sing out of that case provided barrel twist is there, powder Bud of mine has an 8lb jug of 50BMG for 260 bucks.
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That’s a pretty cool looking cartridge. Should sling the heavies like Gunner said!
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That's pretty special. I think every rifle nut, would like something like that.
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Have to remove the i and dot before imgur
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I may not be smart but I can lift heavy objects
I have a shotgun so I have no need for a 30-06.....
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Would someone kindly explain how you go about converting the 9.3-74R to a rimless head?
Also, what is the base diameter?
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Would someone kindly explain how you go about converting the 9.3-74R to a rimless head?
Also, what is the base diameter?
Usually, you hold the case in a die, in the lathe, and remove the rim and cut the extractor groove in one operation with a form tool. This is much the same as was done to form brass for the Gradle express or the Wade Super 7 from 348 Winchester brass. I don't have a 74R case to measure but I think it's around .476 or so. GD
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I turn the flange off with a parting tool, then use this tool to recut the groove. The Hornady 10th edition load manual shows both the 9.3x74R and the 280 AI at .469" at the base. Tony [img] https://imgur.com/sFkcJjf.jpg?1[/img]
Last edited by TonyRumore; 07/01/21.
Run it up, until you blow it up, then back it down a bit.
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Very cool, but is it worth the trouble? If you even have to ask that then you may not be a certifiable gun loony. The 6.5 Weatherby RPM x 280 would also be interesting, but another long way around to get to 7 RM performance. In 25 caliber the standard 25-06 does well and the 25-06 AI only slightly better, giving only about 100-150 fps more velocity. The 257 Weatherby still holds the crown as anything much faster will be a major barrel burner.
A 6mm would be very interesting as the 6mm AI and 240 Weatherby do well with out a ridiculously short barrel life. The stretched case should do well and be close to the belted or WSM 6mms with probably better barrel life.
I like easy and anything more time consuming than the Gibbs cartridges is a no go for me, but then I don't have my own lathe or mill, or the skills to use them.
Last edited by DBoston; 07/06/21.
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Basically your new round is a 284 Gibbs or 280 JDJ, same same.
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I believe the Gibbs cartridges used the parent case and just moved the improved shoulder forward just enough to give minimum neck length. This is a whole new beast!
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7mm Mashburn/Dakota/STW in different attire.
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Why waste your time, just goo 7MM Remington Magnum or if you must 7MM Remington Ultra Magnum? Rifle looney!
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Would be surprised if your 280 Rem Imp to 280 "Super Ackley" doesn't exhibit signs of a blown out or eroded throat down the road.
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Basically your new round is a 284 Gibbs or 280 JDJ, same same. I'm not sure what you're talking about here. Those two rounds are only 30'06 length. This one is stretched to 375 H&H length. I wouldn't call that "same same", but nice try. There are plenty of legitimate ways to crap on this cartridge, but saying its already been done before, isn't one of them. Tony
Last edited by TonyRumore; 08/27/21.
Run it up, until you blow it up, then back it down a bit.
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I've got a Sako AIII with a severely blown out throat, chambered in 280 Rem Imp. I was going to just rebarrel it to 280 AI, but the action on the AIII is 375 H&H length, not 30'06. So I just rechambered the original barrel in 280AI, but at the 375 H&H length. It was a bit of a pain to get the cases to form, but I managed to get there. Here's a pic of the Super Ackley (left) next to a standard 280 Ackley Imp. The Super Ackley case holds 84.1 grains of water. I've got a bunch of cases fire formed and ready to go, but haven't worked up any loads yet. It may be better just to neck it to 6.5 or 25cal instead and forget the about the long 280 since it probably won't out run a 7 Mag anyway. Tony Rumore Tromix Edited to add - The parent case is a 9.3x74R. [img] https://i.imgur.com/tCwy5yB.jpg?1[/img] I have a single shot chambered for the 7x75R vom Hofe Super Express, which sounds like your wildcat. Mine is rimmed, your's sound rimless. The x74R brass is indeed much longer than the '06 and its variants. Overall case capacity doesn't appear much different.
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