K31 and RCBS 309-200-SIL?

[rvpilot76]

I've got both, but never tried them together. Anyone with experience loading the 200+ grainers in the Swiss? Jeff in NZ has a good load in the Enfields with 41 gr. H4350 that I thought I might try.

[chuebner]

Don't know about the RCBS 200 grainer but both my K31's like the Lee 200 gr. My DC mold casts at .298 above the first band and shoots really well even set deep in the case. Best load is 18gr. of SR4759.

charlie

[Kraschenbirn]

Like Chuebner, I haven't any experience with the RCBS 200-grainer but the Lee 311-200-1R shoots shoots quite well in my K-31...like 2" 100M groups using the original military sights - off sandbags, of course - if I do my part.

Bill

[FAsmus]

Pilot;

As that old thread about me getting a K31 relates the rifle works well with some several bullet designs.

After some several experiments I have settled on RCBS 30-165-SIL and 29 Gr Varget. The RCBS designs, being similar as they are, the only difference between the 165 and 200 grain versions will be due only to those found from tooling differences in production ~ and where it is they put the additional 35 grains of lead.

The nose or the bullet body? If the nose I'd say things would be ideal since a short body lends itself to the K31 chamber without the bullet base extending into the case while maintining as nice heavy bullet. If the body, well you're back to the old deal those fellows shooting the Lee bullets contend with; leaving bullet & GC shank down inside the case.

Good evening,
Forrest
Forrest

[Bullshop Junior]

I tried 200gr boolits in my K-31, but I did not try that boolit.
I used a Lyman 200gr and 32.5gr on IMR 3031

[rvpilot76]

I guess I was looking for any load data in the Swiss with the heavier boollits, as I can't find anything published so far. Thanks guys, keep 'em coming!

[FAsmus]

Pilot;

I ran into the same lack of data with my K31 ~ so ~ noticing that the 7.62x51 is pretty darn close and CB shooting not pressing pressure limitations anyway I just used its data as a good starting point for testing.

The 165 gr RCBS and Varget is straight out of TFS match winner results for the boys shooting 7.62x51.

Good evening,
Forrest

[SCIBUL]

I also use the LEE 200grainer with pistol primers (CCI) and 28,5grs of Vihtavuori N133. It does well (3") at 200 meters (219yards) with a decent scope.

[big boar]

Sorry can't help with the Swiss but I've used the 200SIL in the 308, very good results at 200yds. Even tried it at 500 a couple of times and was pleased with it.

[swheeler]

200 gr Lee in K31
33-35 gr 7383, 1756-1820
20-22 aa 5744,1550-1624
52.0-58.0 gr Wc872- 1761-2003
30 WC846+dac-1963
51 -5010-1665

[kirb]

I have just stated shooting a 200Gr boolit eagan mold in my K31 I have the ST,Maries sight the target below is 10 shots 100 yards 17 GR of 2400 and a wolf primer. I am going out to 200 yards on sunday if weather is good. dont know what happened with the one in the bottom of the 9 ring but I amd sure it was Pres Bush fauilt Ha Ha

Kirb

[STP22]

My 1950`s vintage K31 likes both of the RCBS SIL boolits.

12gr. of Unique and any LR primer works pretty good out to 250yds so far.

[mto7464]

My K31 hated the Lee 200. I tried all kinds of different loads with it too. Now my 1911 loves it. My K31 is very tight so I had to seat the 200's way deep so my best bullet is the Lyman 165 SW unlike the 1911 which has a VERY generous throat. I asked this question here before and I got many answers that the twist is not right for the heavier boolit but it looks like many are getting it to shoot well. Perhaps it is seating depth or the RCBS vs the Lee?

[Ricochet]

The problem I had with my first Lee 200 grain mould was that the bore rider was too fat to go into the K-31's rifling without hammering the bolt closed. The lands are .296" and the grooves .308" in mine, and the bore rider was a bit oval, .302 x .304". Tight fit! I saw lots of folks on here complaining about theirs only having a .298" bore rider and figured that'd be just the ticket! Traded for one that's supposed to do that, but haven't yet gotten around to casting any. I do think that a boolit with a long bore rider well supported by contact with those .296-.297" lands and a very short .308" body that fits in the case neck should be ideal in the K-31. The 1911s can handle a much fatter nose section than the K-31.

[STP22]

The RCBS SIL moulds in my WW alloy cast small enough on the noses to seat normally...the Lyman may drop a bit too large to do the same. Mine cast very near to .309, and I size with a .309 die. The noses fit my rifle`s throat w/o having to seat any deeper...meaning the gaschecks don`t go below the necks. By tradition, the RCBS moulds do tend to drop very close to the smaller diameter...they are spec`d to use Lino. The ones I have used seem to agree even with WW alloys.

I had to test chamber a sample of both to check their fit in my rifles throat to insure they did chamber with little difficulty and that they also did not get pushed down too deep.

Most K31 bores are excellent due to the fact that the crew that they were issued to were in fact responsible for them, but when we get them and try to shoot cast with them, the very short throat and "smallish" bore diamter dictates that we use a somewhat smaller boolit than we are accustomed to for 30cal., especially the nose diameter.

YMMV...

[mto7464]

The RCBS SIL moulds in my WW alloy cast small enough on the noses to seat normally...the Lyman may drop a bit too large to do the same. Mine cast very near to .309, and I size with a .309 die. The noses fit my rifle`s throat w/o having to seat any deeper...meaning the gaschecks don`t go below the necks. By tradition, the RCBS moulds do tend to drop very close to the smaller diameter...they are spec`d to use Lino. The ones I have used seem to agree even with WW alloys.


YMMV...

My Lyman also drops them small and is a perfect fit for my k31 (with ww not Lino) after I size them to .308

[madsenshooter]

I have just stated shooting a 200Gr boolit eagan mold in my K31 I have the ST,Maries sight the target below is 10 shots 100 yards 17 GR of 2400 and a wolf primer. I am going out to 200 yards on sunday if weather is good. dont know what happened with the one in the bottom of the 9 ring but I amd sure it was Pres Bush fauilt Ha Ha

Kirb

Which Eagan mold to you have Kirb? I have some interest in them as I have the cherries for MX3-30AR, MX3-30G, and MX3-30US.

[kirb]

Which Eagan mold to you have Kirb? I have some interest in them as I have the cherries for MX3-30AR, MX3-30G, and MX3-30US.

madsenshooter,

I have the MX3 30x It is a sweet mold single cavity brass nose pour which you more than likley know. Loaded some to day for my 308 bullberry hope they work as well in it as they do in the k31.

Kirb

[bkbville]

Most K31 bores are excellent due to the fact that the crew that they were issued to were in fact responsible for them, ...
YMMV...

Also - the K31 (and K11) never saw a corrosive primer - the Swiss GP11 ammo is all non-corrosive.