Hello guys, I'm seeking loading data to the rimmed 8x65RS because I think a single shot rifle (e.g. Ruger No.1) chambered for that caliber would be an interesting option for my purposes. I intend to use the 250gr bullet only (Woodleigh in my mind) to get close to the 318WR in effect. From what I saw in the 10th edition of Cartridges of the World it is based on 9.3x74 case.
Is the velocity 2300 - 2400 fps real?
Thank you for your inputs in advance.
CZ

Because the max. pressure of the 8x65RS is the same as with the rimless sister 8x64S you can use the same powders and loading datas.
I have no data for the heavy 250grs bullets, but I have a lot for bullets up to 227grs.
You can use reformed 9,3x74R - cases, but it is much easier to reform 7x65R - cases, you only have to open up them to 8mm and fireform. The neck is a little shorter - you have than a 8x64R - but this is no problem!

The 8x65RS is a pretty exotic animal... No factory guns, no factory loadings, no factory brass. Pity, though, I have always felt it is exactly the cartridge needed between standard cases such as the 7x65R, 8x57RS and 9.3x74.

Data for the 8x65RS will be few and far between. You could check QuickLoad, or use 8x57RS data as start loads. Alternatively, in an action as strong as a Ruger #1, you could use 8x64S data (at least available from QuickLoad). If I'm not mistaken (I don't have the access to my books here at work), the RWS manual may also contain load data for the 8x65RS cartidge - although only for RWS powders (fairly close to some Alliant or Norma powders, as they are all manufactured by Bofors in Sweden).

For dies, you can use 8x64S dies, or get 8x65RS dies made - either available from http://www.ch4d.com/. The RWS book suggests you neck up 7x65R brass, so I'm not quite sure why it would be necessary to start with 9.3x74R cases? The 7x65R brass is pretty readily available and can be had at fairly reasonable prices. I don't know the exact dimensions of the 7x65R vs 8x65RS, but you may want to make a "false shoulder" on necked up 7x65R brass to avoid the brass stretching excessively in the initial firing. It depends on the head - shoulder dimensions of brass vs chamber.

An alternative to the 8x65RS (although also pretty exotic) might be the 8x75RS. Ballisticly, the two are peas in a pod.

Sorry, I have never loaded 250 grs bullets in a .323 cal rifle, so I can't guess at speeds you might obtain with bullets as heavy as this. With bullets in the 200 grs range (my favourite for this class of cases), expect 1-200 fps more than what a 8x57RS will give you.

- mike

Hmm, what about the 8,5x63R, the basic brass is the 7x65R?

quote:

Originally posted by Burkhard:
Hmm, what about the 8,5x63R, the basic brass is the 7x65R?

I have never formed either case from the 7x65R. But it is common for cases formed from other brass to be a tad on the short side. As long as it is only the neck which is shorter, this is of little consequence.

- mike

Guys thanks for sharing...
If you think I can use the loading data for 8x64 then we are in the same class as 8mm-06.
According to the Ackley's data this cartridge should be able to get with the IMR 4831 (62.0grs)2380 fps. You know I have the 7x57Rx20ga büchsflinte and the 9,3x74 is not necessary for my purposes, so the 8x65RS is a logical step cause I am the single shot rifle admirer.
CZ

You can use the 8mm06 data!