Hello all, Just thumbing through my Hornady reloading manual and came across the 7.5 Swiss cartridge. I've looked at this case numerous times, but that was before I was a member of the forum. Now that I can bounce my ideas of very knowledgable people, I thought I'd ask if anyone on the forum has ever done any work with the 7.5 Swiss cartridge, as fas as wildcats in .257cal - .284cal ? Dimensions look like it would be a good parent case just necked down, without any improvements. If you were to give it an Ackley facelift, it may give approx. a 7% to 10% improvement (pure speculation) ? Also without a rebated rim to work (fight) with, it's likely little to no time and effort would be required getting it to feed properly. With case dimensions being what they are, BUT shorter than the 06 case, a standard length action would be required for seating depth versatility, and optimal cartridge OAL, regardless of caliber. I was thinking it would make a very efficient, very versatile 25x55 Swiss AI. It would have more capacity than the 257Rob, but less than the 25-06. A 6.5 or 7mm would also be very versatile, since any bullets in those 2 bore sizes could be seated to depths that never impinge on powder space. Just my thoughts, I wish I had some cases to play around with, and give some more technical specs, but I can't at this time. Being an oddball cartridge, the number of people with experience using it, may be pretty small. Whether or not it's a worthwhile project is purely up to the individual who just wants something different. It may make for some interesting conversation...guess we'll see.
Elkhamr
Elkhamr, like with some other military brass the free market principle of demand precipitating supply clearly ensured that there certainly is no reason why even the most negatively oriented wildcatter soul should feel any compulsive obligation to avoid the excellent Swiss cartridge. Depending the thickness of the front end material of the commercial brass the case design lends itself well to become a launch pad for a 9.3mm heavy bullet - either for a full length, full power bear killer or a shortened mildcat.
I am sure that expert advice will be added to the discussion so that, like my own quest for a 250gr projectile at 1,800 ft/sec, the interest and help by real experts like Crooked Creek, MikeG and others, your planned process will be systematised into one coherent body of knowledge too - which will have edification value for those interested in using the lesser known European cartridges - either as a base for modification or simply as they are - and possibly even educational value for others not directly interested in the subject matter but still experiencing a desire to learn even if it is not by conscious choice
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A while ago I had the privilege to view a matched set of three very pleasantly done Mauser '98 rifles chambered for the 7x64 Brenneke, 8x64 and 9.3x64. These are old, high pressure German chamberings that clearly indicate the value of enlarging the case mouth of any .30" and larger - particularly when the water volume is above 60gr. The 9.3x64 is an exact match of the .375 H&H with the same bullet weight.
It surely is a satisfying sight to drive through Switzerland and see school boys on their bicycles pedalling to the shooting ranges with their K-31 carbines slung over their backs. Marksmanship is part of the school curriculum.
I am sure that expert advice will be added to the discussion so that, like my own quest for a 250gr projectile at 1,800 ft/sec, the interest and help by real experts like Crooked Creek, MikeG and others, your planned process will be systematised into one coherent body of knowledge too - which will have edification value for those interested in using the lesser known European cartridges - either as a base for modification or simply as they are - and possibly even educational value for others not directly interested in the subject matter but still experiencing a desire to learn even if it is not by conscious choice
.A while ago I had the privilege to view a matched set of three very pleasantly done Mauser '98 rifles chambered for the 7x64 Brenneke, 8x64 and 9.3x64. These are old, high pressure German chamberings that clearly indicate the value of enlarging the case mouth of any .30" and larger - particularly when the water volume is above 60gr. The 9.3x64 is an exact match of the .375 H&H with the same bullet weight.
It surely is a satisfying sight to drive through Switzerland and see school boys on their bicycles pedalling to the shooting ranges with their K-31 carbines slung over their backs. Marksmanship is part of the school curriculum.
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