308 bullet in swiss 7.5x55 brass
While the specs for 7.5×55 Swiss show the bullet being 7.77 mm or 0.306", every reloading source I have seen for this round list the use of .308" bullets.
You can find reloading data for this round in Hornady's
Handbook of Cartridge Reloading, 9th Edition and Lee's
Modern Reloading, Second Edition.
I've loaded mine with the following:
* Hornady 150 gr FMJ-BT (Item 3037)
* 150 gr InterLock DTSP (Item 3033)
* 150 gr InterLock SP (Item 3031)
* 155 gr A-MAX (Item 30312)
I've also loaded with cast bullets from this mould:
http://noebulletmolds.com/NV/product_info.php?cPath=30_351&products_id=343
7.5×55 Swiss can be tricky to load. Many bullets need to be seated pretty deep, resulting in shorter than usual rounds, to get them to chamber properly. I am guessing that this is due to the chamber being sized for the long and sleek ogive of the GP11 bullet. The ogives on the Hornady bullets are squat and fat in comparison so you need to seat things deeper. While they are a bit pricey, I really liked the 155 gr A-MAX bullets in this round -- the assembled rounds look really good and the bullet depth is not too deep.
For some reason I always have a hassle setting up the Lee sizing die for this cartridge. Not sure why but I always get it wrong the first time and end up squashing a case. With most cartridges you screw the die into the press until it touches the shell holder on the raised ram. But for this cartridge I think you need to screw the die down until it encounters the
case mouth in the shell holder. The die I am using is an older Lee die that I bought used and that did not come with its instructions.
All of my reloads have been in either previously fired Prvi Partizan brass or new Prvi brass from Tradeex.
I don't often shoot surplus GP11 but when I do I keep the brass. It is Berdan primed so it will need some re-work to convert it to Boxer primers.
I bought an RCBS pocket primer swager --
http://www.rcbs.com/Products/Case-Preparation/Accessories/Primer-Pocket-Swager-Combo-2.aspx -- for this and plan to use the technique where you swage small bits of copper tubing into the primer pocket --
https://www.youtube.com/watch?v=AkKJfvMyuDg
I've been happy with my Swiss reloads. The accuracy I get out of them, as kludgy as they are with shorter-spec-overall lengths due to the need to seat some of the bullets so deep, is a testament to the quality and abilities of the K11 and K31 rifles.
I've also made up 7.5×53.5 rounds for the Schmidt-Rubin 1889. Those use cast bullets from the NOE mould noted above and loads based on 30-40 Krag data for cast bullets.
Good luck with your loading!