7.5 Swiss

[mag_01]

Gentlemen the Swiss 7.5x55 cases are available from Graf's for about 30 bucks--- Just ordered some over the phone. Mag

[VintageRifle]

Up to $36.99 now for 100.

[PPpastordon]

Well, I have no idea how much they would cost, but in the early 70's, when NO 7.5 brass was available, I made great performing and long lasting brass from .284 Winchester. In today's market, though, it might even cost more.
PPpastordon

[Ricochet]

That, of course, is because Winchester based their "innovative new" .284 on the ancient 7.5mm Swiss case, necked down, "Improved" a bit Ackley-style, and with the rim turned down to fit the standard Mauser-size bolt face without modification. Mr. Rubin was a cartridge designer ahead of his time.

[OeldeWolf]

I am starting to get into the Swiss rifles (have been studying them before taking any of mine out to shoot them).

As I understand it, the resized .284 brass will work well in the K31. But due to extractor differences, it may not work in all of the 1911 rifles. That turned down rim being the problem, when combined by an often shorter extractor. I have not really heard much on this topic about the K11's, though.

I understand that the actual bullet is also very close to the VLD designs.

[45 2.1]

[quote=OeldeWolf;225858]As I understand it, the resized .284 brass will work well in the K31. But due to extractor differences, it may not work in all of the 1911 rifles. That turned down rim being the problem, when combined by an often shorter extractor. I have not really heard much on this topic about the K11's, though.
[quote]

The 284 cases work fine in the K11s. Just operate the rifle bolt firmly and they do fine and last forever. It was all I had for many years besides 20 some Interarms cases.

[PatMarlin]

I've just negociated a deal for a K31 from one of our own Cast booliteer brethren. How's the accuracy with cast been with these awesome looking rifles, and what's your favorite boolit molds?..:drinks:

[Ricochet]

I've had a bunch of groups in the 2" range at 100 yards with the old Aladin HBC bullet and now with the Lee 200 grain bullet I have some more of the same (over a compressed charge of WC860.) Haven't been shooting enough with that one to have a lot of experience yet. Mostly I've handloaded my milsurps with IMR 7383 previously. Since the HBC was a one-off mould no longer available, I'd recommend the Lee. Mine does cast the noses oversize, requiring a hard slam of the bolt to chamber and lock. (With the noses coated with LLA.) Wish I'd gotten one with the skinny nose some of you guys complain about, it would be perfect for the K31. I don't need to get rid of this mould in any case, it works in the K31 and is a nice diameter for "normal" .30s. But the Lees obviously have a lot of variation, with some reportedly casting bore riders at around .295", and mine being .302x.304". (With a .312" body that I size to .308" for my K31.)

[KCSO]

Mine has the St. Marie mount and a 4x scope and wiht w/w 748 and a Lee 200 gr. bullet I have got down to 1.25" at 100 yards. I free floated the muzzle end and the gun shoots better than I can hold.

[jack19512]

what's your favorite boolit molds?..:drinks:





I have several Lee molds but my K31 seems to prefer the 200 gr. bullet over the others.

[Charley]

As I understand it, the resized .284 brass will work well in the K31. But due to extractor differences, it may not work in all of the 1911 rifles. That turned down rim being the problem, when combined by an often shorter extractor. I have not really heard much on this topic about the K11's, though.


Reformed .284 brass works fine in my G1911s. I haven't seen any G1911s that won't function with the .284 rim, although I have heard some folks say their rifle won't extrac reliably with it. Production tolerance.

[mto7464]

When is someone going to get a good bullet for the GB? The one on there now, that was mentioned could be used for the 7.5, is still to large in the nose to work well in mine. My rifles slugged out like Ricochet's and I would like a nice bore rider to try.

[Ricochet]

I understand my K31's bore dimensions are typical.

About a year ago somebody proposed a GB bullet designed specifically for the K31 and basically got blown off. I think I was involved in that and didn't see the need myself then. I now think a bullet with a short body of .308-.309" diameter just long enough to fill the neck and a long skinny bore rider of .298" or so would be the ideal K31 bullet. The Lee 200 grain with a skinny nose is pretty close to that. Body's a little long, when it's seated to crimp groove depth (which is just right), the base is at the bottom of the shoulder inside the case.

Because there is almost no throat in a K31, the rifling starting just ahead of the case mouth, having a bore rider that fits snugly but not jammed tightly into the rifling for most of the exposed bullet length as loaded is the way to go.

[mto7464]

I ordered a 200 grain Lee yesterday to see how it works. I would still like to see a GB for a boolit designed for the K31. Should one of us try to get it started?

[Ricochet]

If someone did, it might lure me back into the group buys. I've sworn off and stayed out of several interesting ones lately. I can't do the honcho thing, though.

If I were designing one, I'd make a gas check body of .311" as-cast diameter of the same length as the case neck (plus about 1/16" for the band in front of the crimping groove would be OK), a cylindrical bore rider section of about .298" diameter as long as would fit in the blocks with a round nose. Probably would look very similar to the Lee 200 grain, with a slightly shorter body section and longer bore rider. Would have to check to make sure the protruding nose wouldn't exceed the allowable OAL for the magazine. Don't want to make my K31 a single shot.