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| the old Schmidt rubin rifles will easily duplicate a 308's velocity's without any type of strain.
and yeah the x55 has been worked over quite a bit.
Winchester pretty much copied it changed the shoulder angle a tick and necked it down to make the 284 Winchester, then norma necked it down to 6.5 etc..
you can order a reamer called the 30x284 and re-work the x55 brass around to make very good chamber fitting brass. |
| | | Posts: 5002 | Location: soda springs,id | Registered: 02 April 2008 | 
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| Bore the barrel to 9 or 9.3mm. You then can load it lightly or to full capacity. |
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| I had a Steyr CISM target rifle in 7.5X55 which I used in NRA High Power competition for one year. It was quite accurate with my hand loads, but I ended up selling up because the action cocked too hard to be really effective in rapid fire. I used Lapua brass, which is really first class stuff.
I have a rifle somewhere in my vault built around the .284 cartridge opened to take .410" bullets. It easily achieved .400 Whelen performance without a hint of the so-called "headspace problems". The advantage to me was that is fit into an unaltered Mauser magazine, which the Whelen would not. |
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| | | Posts: 410 | Location: Finland | Registered: 31 March 2007 |
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| Igorrock The 7.5x55 opened up to 9.3 would be very close to 9.3x62 ballistics providing it was chambered in a strong action. In a strong action like a good 98 mauser and operating @ 50K psi this would be a powerfull combination. |
| | | Posts: 2443 | Location: manitoba canada | Registered: 01 March 2001 |
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| Snowman the big issues are the magazine and the bolt face. The mag taper is all wrong and you would need to alter the feed rails, bolt face and extractor. The easier mod would be to use the 7.5x54 French round and even easier the 7.7x58 Japanese round. Japanese reamer specs use the same head size and taper, plus the same neck diameter, since the Japanese round has a thinner case neck. So you could make a 7.62x58 wildcat using a 7.7x58 reamer, reloading dies and '06/8x57(fireformed) brass. The truth is that '06 brass fits the mag well enough to cycle with up to 180 grain bullets and with slight mag length mods any weight. quote: Originally posted by snowman:
Picked up a handful of cases at the local range the other day. They seemed rather "fat". A quick check of the cases revealed that they were new boxer primed cases, likely from eastern Europe. While only 55 mm long this fat little cases has a capacity very close to a 30-06 case. It would seem this would make an ideal case for some of the intermediate length mauser actions. If the only brass that was available was berdan primed military type that would certainly limit a cartridges usefulness but Norma makes brass for this (a little expensive)and now cheap brass from Europe makes this doable. With the trend to play with short fat cartridges and brass being available....... Has anyone played with this calibre or necked it up or down?? The old Schmit Rubin rifle certainly wouldn't be practical to try making a sporter out of but the intermediate mausers should work.Just curious.
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| quote: The 7.5x55 opened up to 9.3 would be very close to 9.3x62 ballistics providing it was chambered in a strong action. In a strong action like a good 98 mauser and operating @ 50K psi this would be a powerfull combination.
I think it would be more near 9,3x57 Swede than 9,3x62. |
| | | Posts: 410 | Location: Finland | Registered: 31 March 2007 |
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| | | Posts: 13257 | Location: Henly, TX, USA | Registered: 04 April 2001 |
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| A .284Win case will size to 7.5x55 with one pass.
Oh and the 7.5x55 will do 30-06 ballistics with no issues!
The Swiss is 66gr and the US is 68gr. |
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| Bobster Thanks for your input. I realize the boltface on a 98 would have to be opened up and the extractor altered slightly. And yes the feedrails would likely need to be opened up slightly. What I don't see is why that is such a big deal. Hundreds of thousands if not millions of mausers have been altered to handle short mags such as 7mm Rem, 308 norma and 300 Win. That has never been an issue. Why would it be with the Swiss cartridge?? If one chose to use 284 cases the bolt face & extractor would be fine as is. Biggest problem is finding a 7.5x55 SR reamer. |
| | | Posts: 2443 | Location: manitoba canada | Registered: 01 March 2001 |
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| Found an interesting rifle a week ago. A BSA model CF2 in 7.5 x55 Swiss. The dam thing even followed me home ! Have a bag of new PPU headstamped brass that has the same capacity as 30-06 brass. Can hardly wait to test fire and chrono some loads. I'm thinking this will be a lot closer to 30-06 ballistics than 308. |
| | | Posts: 2443 | Location: manitoba canada | Registered: 01 March 2001 |
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| A friend of mine is a real fan of the 7,5x55 and has screwed a Lothar Walther bbl. on a K 98 action + a Mc Millan stock (reamers can be had at Triebel in Germany : http://www.triebel-guntools.de...ebel-guntools-today/. The rifle is accurate (sub MOA) and the stronger Mauser action allows loading to .30-06 levels.
André
DRSS
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3 shots do not make a group, they show a point of aim or impact.
5 shots are a group.
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| I have used the 7.5x55 for military rifle benchrest extensively. It was much easier to achieve small extreme spreads and standard deviations with it than either the 30-06 or .308. Still shooting it for High power Silhouette and vintage military silhouette. A great round. |
| | | Posts: 126 | Location: nothern ca | Registered: 29 August 2010 |
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