Cast Bullet Handbook for 7.5x55 Swiss

[qajaq59]

Does a Cast Bullet Loading Manual exist that has the 7.5x55 Swiss loads in it. I have the jacketed loads, but I have not been able to find anything on cast loads.

[Scrounger]

Does a Cast Bullet Loading Manual exist that has the 7.5x55 Swiss loads in it. I have the jacketed loads, but I have not been able to find anything on cast loads.

Probably not but .308 Winchester data would be safe if you use it properly; don't start at the top.

[jballs918]

i also have the same question. i have 3 different CBs i want to use but i havent found much for them also. i was looking to use im4195. i think it was im4195. cant remember but it wnet with all my other rigles i had.

[qajaq59]

Scrounger, I think that you are correct because I've looked all over and no one has come up with an answer including the powder companies. Thought I'd ask though. Thanks all

[Jeffreytooker]

You could use 13 gr Red Dot.

The above problem is why I went to Quickload. I have not loaded for either of my 7.5X55 Swiss rifles as of yet. Moving to the home place. However I have developed several loads for Cast Boolit rifles with it.

Jeffrey

[Buckshot]

..............The 7.5 Swiss can easily be loaded with any cast boolit data shown for the 308 as Scrounger suggested. All the old standby generic cast boolit loads for pre WW2 full power battle rifle cartridges will also work as a place to start.

You're talking a slug from 160 to 200 grs, and starting at 12.0 Unique, 16.0 2400, 20 -22 grs 4227 - SR4759, and 21-24grs 4198. Any of these will work and form a base line for further experimentation.

..................Buckshot

[smithnframe]

16 gr of 2400 works for me in all military surplus rifles with cast bullets.

[TheBigBang]

I don't own a 7.5x55 Swiss rifle & have never loaded for one. However, there is some info in the Hodgdon data manual that I think you should be aware of. According to this info, of the 2 Schmidt-Rubin rifles that were chambered for this round, the 1889 model has a weak action & a bore diameter smaller than .308 for which no correctly sized bullets are available(of course, that could be remedied). They say the original load developed less than 40,000 C.U.P. & that the 1889 models should be relegated to "wall hanger duty", this is Hodgdon's suggestion, not mine. They say the model 1911 rifles CAN use the .308 bullets & that the round is ballistically quite similar to the .30-40 Krag & .300 Savage & that brass can be formed from .284 Win. cases with dies from RCBS. They list several loads, but not for cast bullets.

[462]

Ah, ha, a 6 1/2 year old thread has been resurrected. Excellent and welcome, smithnframe.

Though Buckshot pretty much wrapped it up, and I've found two excellent loads using his listed powders, let new ones be forthcoming.

The K-31 model can safely be loaded using .308 Winchester information.

[Danderdude]

K-11's and older Schmidt-Rubins are capped at 3200 BAR (46,400 PSI) max chamber pressure, as is the GP11 ammo that serve them.

K-31's are rated for 3800 BAR (53,000 PSI) by CIP. The comparatively larger chamber of the K-31 also allows the brass to gain several grains of volume after being fired once. Note that the Lee and RCBS 7.5x55 dies size the case back to GP11 dimensions, while the Redding and Hornady K-31-specific sets size to just under K-31 chamber dimensions.

With a K-31 for full-power loads in the 2700+ FPS range with 185gr boolits, I suggest RL17, but the round works equally well with anything from Unique to 50BMG pulldown duplex loads. If you average together .30-06 and .308 pressure data you can extrapolate a load pretty closely.

Also of note is that, due to the camming action of the bolt, loads over 50k PSI start getting a little sticky. This is normal and not a result of overpressure, but these are older rifles and don't need to be abused in such a way, even though the option is there.

[jonk]

I don't own a 7.5x55 Swiss rifle & have never loaded for one. However, there is some info in the Hodgdon data manual that I think you should be aware of. According to this info, of the 2 Schmidt-Rubin rifles that were chambered for this round, the 1889 model has a weak action & a bore diameter smaller than .308 for which no correctly sized bullets are available(of course, that could be remedied). They say the original load developed less than 40,000 C.U.P. & that the 1889 models should be relegated to "wall hanger duty", this is Hodgdon's suggestion, not mine. They say the model 1911 rifles CAN use the .308 bullets & that the round is ballistically quite similar to the .30-40 Krag & .300 Savage & that brass can be formed from .284 Win. cases with dies from RCBS. They list several loads, but not for cast bullets.

It's really a different round for the 1889; namely the 7.5X53.5. Hodgdon is just repeating the same pap that everyone else is; yes the action is a bit weaker than later designs, but is certainly in the 30/40 range as you note. Mine slugs right at .3075, close enough to .308 so as not to make any difference if you don't try to hot rod it. With cast of course, the standard mantra of starting at 1/1000 over groove diameter applies.

To the larger issue, any cast data from the Lyman book or other sources for the 308 or 30/40 can be used, and even 30-06 if you avoid top end loads.

[DonMountain]

I am getting good accuracy from the RCBS 30-180-SP gas checked boolit sized to 0.309 over 34.0 Grains of IMR-4895 and WLR primers in Norma and converted Winchester 6.5 x 55 cases in a Swiss Model 11 carbine. I have tried going higher on the powder but my groups started to spread out. But no overpressure signs ever appeared with this combination. So I assumed that I was just going too fast for the lead that I was casting with (Wheel Weights). So with a harder alloy I might be able to go higher on the 34.0 grains of IMR-4895. I am now working with a new can of H4895 and getting similar results. I have never had any "sticking" problems with ejecting or pressure signs on the primers before the lead boolits give out. I think I originally extracted this data from the .308 and .30-06 listings.

[Kraschenbirn]

My G96/11 likes 30.5 gr. H4895 under a Lee 309-200-1R (sized .310) loaded into Privi 7.5x55 cases. While cases formed from .284 Win. work just fine in my pre-war K-31...which, incidently, also shoots quite well with same powder/boolit combination...there's just enough difference in rim diameter between these and *real* 7.5x55 cases that my G96/11 often fails to extract when using Win. cases. Dunno if anyone else has encountered this but I've solved it by reserving my somewhat limited stock of Privi cases for the 96/11 and shooting the Winchester stuff in the K-31.

Bill

[1Shirt]

Agree with Buckshot. I started with load data using 30-40 Krag data, and it worked well. Have had very good luck with 311291 .309, over RL-7, w/Prvi brass, win primers. Recently acquired an old Ideal mold 308414, that I also have hopes for.
1Shirt!

[airone46]

Good morning at all, I am a new insider and I have a small defect: I DO NOT SPEACK ENGLISH and my computer translator tells english worse than me!

I disturb you for a little information:
I have a Schmidt Rubin K31 of 1955 really new. I would recharge cartridges using cast bulletts. I have LEE MOLD DC CTL312-160-2R with g.c. + size LEE .309. (groves TL are very good for ALOX)
I would kindly like to receive some reloading data for these bullets: however, in Italy there are not many of the powders that you have in the USA!
There are the Vithawuori and something Winchester and IMR: I have IMR 800X!
Thank you all