K-31 Swiss
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Old 10-08-2012, 09:40 PM   #1
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Default K-31 Swiss

I thought I would try a K-31 Swiss 7.5X55 on our 1,200 meter range. This rifle along with a number of other Milsurps lives in the gun room. I found a 20X scope and mount for the K-31. The first test were with military loads using a 173 grs FMJ these shot great at 100 yds. They were very good keeping hits very regular on the 600 meter gongs.

I have read that the K-31 will not shoot the BT bullets. I order .308 BT 147 grs. bullets from Widners to feed my Garands. Having 1,000 of these bullets I decided to find out if the K-31 would shoot the BT.

After trying a number of powders with only marginal success I settled on Rl-15. The final load is 50/RL-15 fired by a Federal Gold match LR the K-31 will keep 5 well under 1 inch. This load should work well out to 700 meters. Some day very soon we will try ringing that 40 inch plate marked 700.

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Old 10-09-2012, 09:46 PM   #2
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I've read in guns magazine that the prvi factory loads will stay at 1 moa, swiss surplus at 1 1/2 moa. Hornady also makes some, but never heard anything about their performance.

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Old 10-09-2012, 11:20 PM   #3
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Duplicating GP11 is very tough. For a 150gr load, I use data from Hornady 7th edition. I picked up a bunch of Combined Technology 150gr BT moly coated for 16.00 per 100 a few years ago. They shoot better then any other 150 I've tried. I did pick up 1000 Privi 165gr PSPBT and after 1 set of testing It looks like a new winner. I've never heard that the K-31 will not shoot BT bullets. Guess no one told my rifle either. It is a fun caliber to reload for as I find more experimentation than w/ most calibers.

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Old 10-10-2012, 04:05 AM   #4
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St. Marie in his reloading Info. says the K-31 will not shoot BTs. The PRVI I bought 173 grs. was dirty and not accurate. These are really fine rifles.

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Old 10-10-2012, 09:08 PM   #5
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Quote:
Originally Posted by nitestalker View Post
St. Marie in his reloading Info. says the K-31 will not shoot BTs. The PRVI I bought 173 grs. was dirty and not accurate. These are really fine rifles.
I did read his article after I posted the other night. I really think that all the components combined are a huge factor when loading this caliber. I have some Graf brass, it shoots pretty good, good enough for 200 yard hunting. Prvi Partisan brass runs about the same. Now, I have 40 Norma cases that outshoot both by a long margin. I also use CCI 200 large rifle primers. W/ IMR4064 it seems to work very well.
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Old 10-10-2012, 09:27 PM   #6
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Thx for your Info My best results have been with reformed .284 Winchester brass. I bought the reformed brass from Buffalo Arms some time ago. Have you tried .284 brass.?

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Old 10-10-2012, 11:25 PM   #7
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The real challenge in reloading for the K-31 will be the shape of the bullet. Compare the shape of the standard military load to most .308 bullets, and notice the LONG taper of the ogive. Those bullets have a better BC than most .308 bullets- designed to "reach out and touch someone" over on the next mountain.

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Old 10-11-2012, 12:06 AM   #8
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Quote:
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Thx for your Info My best results have been with reformed .284 Winchester brass. I bought the reformed brass from Buffalo Arms some time ago. Have you tried .284 brass.?
That I have not.

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The real challenge in reloading for the K-31 will be the shape of the bullet. Compare the shape of the standard military load to most .308 bullets, and notice the LONG taper of the ogive. Those bullets have a better BC than most .308 bullets- designed to "reach out and touch someone" over on the next mountain.
Looks like all GP11 is boat tail, does it not??
http://en.wikipedia.org/wiki/File:GP11_coupe.JPG
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Old 10-11-2012, 12:21 AM   #9
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Sure looks like it. Am too tired to go find the kinetic puller and take down a round.

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Old 10-11-2012, 12:44 AM   #10
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The supply of these fine rifles is about gone. Wideners Supply has all models in stock ready to ship.

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