recently purchased a 7.5 Swiss. As an alternative to buying loadable brass, what cases can be used to form this caliber. Thanks for any info

Use 7.62X54 Russian. Turn rim to .495"dia. cut new extractor groove. F?L size in Schmidt Rubin die. Case will be abour.090 short but, otherwise fine. Final form in chamber. use .308"dia bullets. Load with150 grain bullet. 46.0 grains of IMR4895 will yield 2775 fps. 165 grain HPBT in front of 65.o grains of IMR4831 will yield 2810 fps. Load source for both loads is. John J. Donnelly in The HAndloaders Manual of Cartridge Conversions. Hope this info will help.

Lee L.

you can use 284 winchester brass and do a full length resize or buy 7.5x55 from graffs and sons a lot easier.....

Suspect you are looking for an easy conversion...there isn't one. Converting 284's is pretty easy, but they are not the most common case and it's doubtful you'll have a pile of them laying around.

IF you've got to order brass anyway, may as well order 7.5X55 cases and be done with it.

Here is a great site for all the info you may need for your swiss

http://p083.ezboard.com/ftheswissrif...sageboardfrm11

Thanks a million for the help, I have a lot of the 7.62X54 brass, its good to know even if I do load the origial Swiss cases, again thanks for the help

Thanks for the info, I do have some 284 Brass, I loaded 25-284 for a while so still have some cases, thanks again,

thanks for taking the time to replay to my question, I do have some 284 Brass from my 25-284 days, but I will load 7.5x55 just needed to know the other in case of any difficulty in getting it in the future, thanks again, I owe you guys one

Midway listed some 7.5X55 on their last closeout listing that I received yesterday.

Lee L.

Thanks Im going to their web site now and check it out.

The Midway close out 7.5x55 brass is Norma. Be prepared to spend $, even at close out prices.

I load for a K31 and a 1911, and used .284 brass for several years. Some rifles have problems with the extractor gripping the smaller rim, but .284 brass functions fine in both my rifles. You can order 7.5x55 brass from Graf & Sons, it is Prvi Partizan, from the former Yugoslovia. At about $27 per hundred, it is probably cheaper than .284 Winchester.

Sako264,

You may already know this. but ignore the trim to length in the Hornady manual. The correct case length for most 7.5x55 rifles is 2.180.

Hornady shows a length of 2.140 which is only correct for the 1889 cartridge that uses a .304 diameter bullet. The 89/11, 11, 31 all use the longer case. When the Swiss standardized the 1911 cartridge, along with changing to a jacketed spitzer bullet they lengthened the case to the longer lenght.

For some reason I can only guess at, Hornady adopted the shorter case length in the first manual they included this cartridge in and have never corrected the error.

I obtained some PRVI brass from Graf's and the primer pockets are nice and tight. I like it so much I got another 300 pieces and have 700 coming now. Should last me the rest of my life.

I just rebarreled a 1911 after getting a 7.5 Swiss reamer. I used new empty cases to headspace the rifle and it works like a champ. Likes 43.5 Varget with 168s.

When I get the right scope I think it will shoot under two inches at 200. I am right at 2 1/2" with a 2X scope which is just a little bit better than iron sights.

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May not be an error from the standpoint that the shorter case will still shoot in the longer chamber. The reverse situation, long case neck in short chamber, could cause excess pressure in the short chamber. The short length therefor is more "universal", though not the best for accuracy in the longer chambers. That's the lawyer's answer, anyway. My data shows maximum 7.5x55 GP11 trim length of 55.60 mm or 2.189", just to add further confusion.

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"First contemplation of the problems of Interior Ballistics gives the impression that they should yield rather easily to relatively simple methods of analysis. Further study shows the subject to be of almost unbelievable complexity." Homer Powley

I suspect that is the reason the PRVI brass shoulder location was WAY SHORT.
I just obtained a carbide 7.5 Swiss reamer from PTG with a GO Gage and as I was barreling up the 1911 and was just shy of the GO gage closing on a whim I tried some new PRVI cases and they were much shorter so I bumped the barrel shoulder forward about .005 and took same off back end and torgued it on. Empty cases closed with no effort but I really didn't know where I was in relation to headspace on those cases.

Yesterday I made a new female section for the Mo Gage and used the same reamer to make it. I "qualified" the gage on five PRVI unfired cases at "0" and checked fired cases and found the shoulders have moved forward .004" to .005". So I adjusted the FL die to size them to .002" and .003".

I checked the PTG GO gage and it is .014" and of course it won't even start to close. I also fabbed a true case length gage with the same reamer. This is done by running the reamer in a inch long section of barrel and stopping it about .075 to .100 before coming out other end.

It is a long known fact that cases become longer as they are resized. Twice fired cases FL sized were inserted and visually checked and there is an estimated .050 from the end of the chamber mouth shoulder where the throat starts so it will be many reloadings before the cases move that far forward requiring any trimming.

With this combination I know exactly where the shoulder locates and where the case mouth stops in the exact same chamber as all three were all cut with the same reamer.

The other beauty of this combo is the fired cases have a fired dimension of .4952 to .496. The new PRVI cases are .495 so I have dead min case head expansion and no more than .002" shoulder movement.

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Distinguished Rifleman High Power , Distinguished Rifleman Smallbore Prone, Presidents Hundred (Rifle), Palma Teams Member (2), Dewar Teams Member (2), Member 4 Man National Championship Smallbore AnySight Team, Certified Small Arms and Ammunition Test Director Aberdeen Proving Ground, Firefighter I,