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Very Hot Topic (More than 25 Replies) Swiss Martini 7.5x55 GP11 chamber (Read 2515 times)
Cbashooter
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Swiss Martini 7.5x55 GP11 chamber
Mar 27th, 2022 at 8:47pm
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A younger friend of mine who is quite an expert on military surplus rifles is starting to get very addicted to cast bullets. (Thanks to me) He recently picked up a beautiful bore swiss martini  7.5 x55. I made a  simple push breech seater and gave him a de-re capper and and he set up  a range kit.today we took it out for its maiden voyage .with the iron sights it was shooting about  1.5 MOA at  100 and  200 yd. I consider that quite a success considering as simple sights. It helps that he was in the military and quite an accomplished rifle shot and has a young set of eyes. So I have ordered a similar gun but with the larger GP90 chamber I was so impressed.
  is nice to get a younger shooter involved in the breech  seating  cast bullet game.
  
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oneatatime
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Re: Swiss Martini 7.5x55 GP11 chamber
Reply #1 - Mar 28th, 2022 at 1:28am
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The Swiss rifles are very accurate. My K31 will do MOA with GI ammo. I found a Lyman 309329 (a reduced diameter 311329) that is a perfect match for the throat and initial testing (fixed) made 1 1/4 inch groups. Need to get back to it and do more extensive testing. I just wish standard issue had been with peep sights. The special target peeps aren't allowed in the service rifle matches.
  
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Cbashooter
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Re: Swiss Martini 7.5x55 GP11 chamber
Reply #2 - Mar 28th, 2022 at 10:16am
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When the K31 rifles were 70 bucks I had a few of them a number of years ago. I wish I would have kept them for resale.
They did have tight bores and tight throats ,that was a battle I fought back then with cast bullets.  Now with the custom mold makers you can get very specific bullets to match those rifles.
I also used the 308329 back then . the undersize molds had a "U" marked on the block by the mold number not the diameter numbers changed.did yours have that?

Those guns are a minute of angle easily, the sites were the only limitation as you said
« Last Edit: Mar 28th, 2022 at 10:41am by Cbashooter »  
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oneatatime
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Re: Swiss Martini 7.5x55 GP11 chamber
Reply #3 - Mar 28th, 2022 at 4:09pm
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That's it, 308329;-) As Lyman said "311329 Designed for the .30-06. Good for target work from 200 to 500 yards. (GC, SP, 185 - TP is 329)". Seems like I read somewhere that it matched the profile of the GI spire point and also that the Springfield arsenal had bought a large number of the Swiss bullets that they used in developing the GI one. Anyone else remember that?
  
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JLouis
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Re: Swiss Martini 7.5x55 GP11 chamber
Reply #4 - Mar 28th, 2022 at 4:17pm
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How does one actually accomplish having the same group sizes at both 100 &.200 yards?
  
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Cbashooter
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Re: Swiss Martini 7.5x55 GP11 chamber
Reply #5 - Mar 28th, 2022 at 4:22pm
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JLouis wrote on Mar 28th, 2022 at 4:17pm:
How does one actually accomplish having the same group sizes at both 100 &.200 yards?

Read the original post it says minutes of angle. Written as MOA in case you didn't know what that meant.. Are you hitting the beer a little early today.
Cheesy
  
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don1885
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Re: Swiss Martini 7.5x55 GP11 chamber
Reply #6 - Mar 28th, 2022 at 4:31pm
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I would pin both targets on top of each other at 100 yds and shoot!🙄
« Last Edit: Mar 28th, 2022 at 4:45pm by don1885 »  
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Cbashooter
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Re: Swiss Martini 7.5x55 GP11 chamber
Reply #7 - Mar 28th, 2022 at 4:49pm
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oneatatime wrote on Mar 28th, 2022 at 4:09pm:
That's it, 308329;-) As Lyman said "311329 Designed for the .30-06. Good for target work from 200 to 500 yards. (GC, SP, 185 - TP is 329)". Seems like I read somewhere that it matched the profile of the GI spire point and also that the Springfield arsenal had bought a large number of the Swiss bullets that they used in developing the GI one. Anyone else remember that?

Yup I do remember that written in a book somewhere  Maybe Brophys .The dimensions of that '329 bullet over the years are all over the board I have one hollow point with the nose that's  it's a little bit bigger up front that shoots well

Cast some last night
« Last Edit: Mar 28th, 2022 at 6:50pm by Cbashooter »  
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JLouis
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Re: Swiss Martini 7.5x55 GP11 chamber
Reply #8 - Mar 28th, 2022 at 5:14pm
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Cbashooter I truly do apologize as I missed that point.
  
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Cbashooter
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Re: Swiss Martini 7.5x55 GP11 chamber
Reply #9 - Mar 28th, 2022 at 5:35pm
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JLouis wrote on Mar 28th, 2022 at 5:14pm:
Cbashooter I truly do apologize as I missed that point.

I've done the same thing I know exactly where you're at
  
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oneatatime
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Re: Swiss Martini 7.5x55 GP11 chamber
Reply #10 - Mar 28th, 2022 at 7:26pm
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You asked, and I didn't directly answer. There is no U on the mold and it is marked 308329. It is an old very small block Ideal.
  
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Cbashooter
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Re: Swiss Martini 7.5x55 GP11 chamber
Reply #11 - Mar 28th, 2022 at 7:28pm
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oneatatime wrote on Mar 28th, 2022 at 7:26pm:
You asked, and I didn't directly answer. There is no U on the mold and it is marked 308329. It is an old very small block Ideal.


Those old ideal single cavities are wonderful.i think all the standard 30's were marked 308xxx back then and later updated to the 311xxx prefix 
  
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rgchristensen
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Re: Swiss Martini 7.5x55 GP11 chamber
Reply #12 - Mar 28th, 2022 at 11:17pm
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I shoot a batch of Swiss rifles, and have an old M1889 to play with.  Later got a schuetzen Martini in that caliber and the chambers are quite different, surprisingly.   The diameter of the leade in the M1889 is .320 or a hair more, made to shoot a .307 bullet PP'd up to .320 or so.  A cast of the chamber of the schuetzen rifle showed a leade diameter of .328 or so, quite large.  HOWEVER, the groove diameter of the barrel is only .299(sic).

A 200 gr bullet for the Siamese Mauser rifles is about that size, so machined some case necks to take it.    Clamping a scope mount to the barrel rail, off to the range.   First 10-shot group was 1.1".   (!)

Similar good results with the .41 cal rifles.   The military Peabodys and Vetterlis want a 300+ gr bullet, whilst the Martini target rifles are rifled slower and like 240's or so.   The Peabody won a "mini-Quigley" match, shooting at bathroom mouthwash cups OH at 100 yd, instead of a bucket at 1/2 mile.

CHRIS
  
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Cbashooter
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Re: Swiss Martini 7.5x55 GP11 chamber
Reply #13 - Mar 29th, 2022 at 9:28am
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I have an ideal stop ring mold(308277 )I used in an 1889 that did well.the ring  is .320 and the nose .299.Base was .310.I'd hoped to use it in the martini but from your info it sounds like I'll be going a different route.id assumed the chamber would have been similar
« Last Edit: Mar 29th, 2022 at 9:34am by Cbashooter »  
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rgchristensen
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Re: Swiss Martini 7.5x55 GP11 chamber
Reply #14 - Mar 29th, 2022 at 5:36pm
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I always make a chamber cast of unfamiliar chambers, preferring sulfur for lower cost and ease of use, over the "cerrosafe" alloys.

CHRIS
  
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