Cleaning the bore on a Swiss K31 7.5x55


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maq
May 3, 2012, 03:55 AM
I have recently been shooting my K31. I have always wondered which size brush or bore rope everyone else uses for cleaning. The 30 cal 7.62 are actually a little tight and the 7 are too small.

What does everyone else use for their Swiss Military Surplus rifles?

Maq

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Edarnold
May 3, 2012, 04:02 AM
The 7.5x55 Swiss GP1911 cartridge used in your K31 rifle is a true '.30 caliber', bullet diameter of .308" with a bore to match. Use the 7.62 brass or nylon brushes, you shouldn't need to clean very much since the bores are very smooth if not worn.

Mikee Loxxer
May 3, 2012, 10:29 AM
I use a 7mm jag with a fairly large patch, it seems to fit just right. The brush I use is 8mm. I too found .30 cal jags to be a little tight. My understanding is the the GP11 bullet is acutally .307" though I have never pulled and measured one.

Caliper_RWVA
May 3, 2012, 12:05 PM
Try slugging your bore to be sure, but when I slugged my K31, it was a .308 bore.

SlamFire1
May 3, 2012, 12:05 PM
I use 30 caliber. I also use 30 caliber chamber brushes. On a straight pull action, keep that chamber clean.

kestak
May 3, 2012, 12:27 PM
You clean it same way you clean a normal US made 308 caliber...:)

With luuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuv!

LJ-MosinFreak-Buck
May 3, 2012, 01:23 PM
Kestak has it right. I used to use a boresnake as the only method of cleaning, but have since returned to using rod-and-jag method because I get to spend more time caring for the rifles (look at me, starting to sound like they're my kids).

shinyroks
May 3, 2012, 01:29 PM
My bore measures .307, so there is a small difference between the standard 30 cal and the Swiss, but not enough to go through the trouble of finding a new rod. I use all 30cal accessories, and haven't found any problems. In fact, I load with .308 dia bullets too! Also, I believe the bores are chromed (correct me if I am wrong) so as Edarnold said it is usually pretty easy to clean.

Another solution to try if your 30 cal jag is a bit tight is to use thinner/smaller patches as well.

parker51
May 3, 2012, 02:59 PM
Also, I believe the bores are chromed (correct me if I am wrong) so as Edarnold said it is usually pretty easy to clean.


I don't believe they are chromed, they just use very shiny steel. I have purchased some for parts that the inside of the barrel was badly rusted and there was no signs of chrome when I tried to remove the rust.

LJ-MosinFreak-Buck
May 3, 2012, 03:23 PM
The bores aren't chrome-lined, neither is GP-11 corrosive.

lonniemike
May 3, 2012, 09:23 PM
Until recently the Swiss government weapons assembly factory(W-FBern) assembled all the 7.5 military rifles(Model 1889 thru the Model1957) from numerous parts contractors. The only exception that I know of was the 1893 model by mannlicher(?spelling?)(hard to find and usually big bucks). The 11 types and later 7.5 types all used GP-11,with a cupro/nickel plating over a mild steel jacket. Actually there are a few exception to the shiny bullets the Swiss used but they are hard to find and rarely seen. All the earlier models used GP-90. They never chromed bores or used corrosive primers. W-FBern states that the correct diameterbulletis.3087". The Swiss solider almost never put a brush down their tubes but they did use basicly a bore snake and grease(Waffenfett and later Automatenfett). The Swiss cleaning technique involved a lot less work-no brushing- but grease, ungrease, shoot, grease, drink beer. I find it odd that one would find a 30 cal jag tight but an 8mm brush is OK. The tightness anyone feels would be that the bore is not .300" but more or less is .295-.297". The groove dia is .308. The 57 modeldoes use a rod instead of the pull rope but it also was basically greased. I use wipeout occasionally when I want a really clean barrel.Best

buggley
May 3, 2012, 09:33 PM
sweats 7.62 works wonders i will never use anything elseto clean my k31

Kliverson
May 17, 2012, 06:29 PM
I just treat mine as you would any .30 cal rifle.

Tempest 455
May 17, 2012, 09:20 PM
I dont use a brush I use a .30 cal bore snake.

igousigloo
May 17, 2012, 09:29 PM
? Most of the bore snakes that I have used have a brush built in them.

madcratebuilder
May 18, 2012, 08:20 AM
Until recently the Swiss government weapons assembly factory(W-FBern) assembled all the 7.5 military rifles(Model 1889 thru the Model1957) from numerous parts contractors. The only exception that I know of was the 1893 model by mannlicher(?spelling?)(hard to find and usually big bucks). The 11 types and later 7.5 types all used GP-11,with a cupro/nickel plating over a mild steel jacket. Actually there are a few exception to the shiny bullets the Swiss used but they are hard to find and rarely seen. All the earlier models used GP-90. They never chromed bores or used corrosive primers. W-FBern states that the correct diameterbulletis.3087". The Swiss solider almost never put a brush down their tubes but they did use basicly a bore snake and grease(Waffenfett and later Automatenfett). The Swiss cleaning technique involved a lot less work-no brushing- but grease, ungrease, shoot, grease, drink beer. I find it odd that one would find a 30 cal jag tight but an 8mm brush is OK. The tightness anyone feels would be that the bore is not .300" but more or less is .295-.297". The groove dia is .308. The 57 modeldoes use a rod instead of the pull rope but it also was basically greased. I use wipeout occasionally when I want a really clean barrel.Best
This.

K31 bore per specification a new muzzle would measure 7.51mm and shot out at 7.64mm. 7.51 is .295 and 7.64 is .300.

Tempest 455
May 18, 2012, 08:32 AM
Most of the bore snakes that I have used have a brush built in them.

Yes but not the same as ramming a brush down the bore over and over.

lonniemike
May 18, 2012, 10:58 PM
30 caliber or .300" bore is 7.62mm. 7.64mm would be a few ten thousands shy of .301".Best

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