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Reloading for Swiss K-31
Hello,
I purchased a K-31 about a month ago. After doing some research before I made the purchase, these are superbly built rifles capable of moa accuracy. Reloading date is limited though. I have somewhat of a load worked up for it using the Sierra 168 hpbt and IMR 4064. I was wondering if there was anybody that has any experience loading for this rifle and what kind of recipies the developed. I would think since the 7.5X 55mm Swiss
is very close to the .308 win/ 7.62X51mm, that the powders that are used for the .308w could be used for the 7.5 Any information would be greatly appreciated.
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04-25-2011 09:24 AM
# ADS
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Don't believe everything you see on the internet. The Swiss
make fine rifles, but the K31 doesn't normally give "moa" groups. With good ammunition, it's reasonable to expect 5-shot groups at 100 yards to average 1.5 to 2.5 inches. Occasionally we see a tiny group, and folks love to brag about them, but that's not what to expect as normal performance in the long run.
The 7.5x55 case has about 13% more powder volume than .308 Winchester, meaning that the Swiss cartridge can benefit from higher-volume loads of slow powders that simply would not fit in the .308 case - and that .308 data used to load 7.5x55 will normally yield lower pressures and velocities, all else being equal. The higher the loading-density, the greater the discrepancy will be. Image below shows pressure and velocity estimates for identical charges in the two cartridges.
![](https://www.milsurps.com/images/imported/2011/04/2d105yg-1.jpg)
It's not generally advisable to solicit specific load information on internet forums. There's just too much that can go wrong - from simple typing errors to malicious information. If you look at powder manufacturer's websites and published manuals, you can find plenty of reliable data for a variety of powders. Here's a sample from Sierra's manual.
![](https://www.milsurps.com/images/imported/2011/04/sierragif-1.jpg)
Because this Sierra data was developed in the 1911 rifle, the OAL figures are too long for the shorter-throated K31, which requires deeper seating.
Last edited by Parashooter; 04-25-2011 at 11:32 PM.
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Thank You to Parashooter For This Useful Post:
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This is a good source for K-31 reloading info. I am headed down the same path you are.
SwissRifles
Many of the discussions I have seen are around trim-to length and OAL. The K-31 "does not tolerate long rounds"
Specifically: Swiss Handguns 1882
I know the link says Swiss Handguns but scroll down when you get there
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That is excellent information!!! Than you very much!!! Especially the bullet seating chart. You are right, My O.A.L. w/ Sierra 168 match is 2.895" I wanted to also try AA2520. The tech at Sierra said it would be safe to start at the .308win minimum load and work up. So you are saying that a slower burning powder like say IMR4350 might be more beneficial due higher case capacity and larger charge?
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