Got my Manson reamer etc coming in the mail

[sambarhunter]

BUT I would like the definitive answer to what RWS`s 10.3 x 68 is..the 10.3 component that is,whether measured in the grooves or the lands etc. 10.3 doesn't tell me what THEIR version in imperial is.
Any one caring to advise would be most welcome.

The drawing. G1 suggests 10.5 or am i on the wrong track!

http://www.cip-bobp.org/homologation/uploads/tdcc/tab-iii/10-3-x-68-mag-en.pdf

 

[bruce moulds]

that is quick for manson.
bruce.

 

[Hogpatrol]

Projectile diameter would be groove diameter. Do you have the reamer print or are the specs what you posted? That print says it's for proof barrels.

Further research: RWS's website states the bullet is 10.3 diameter. Print says projectile is 10.5.


https://rws-munition.de/en/rws-hunt...unters/Product/show/103x68-mag.html#!0/19/760

 

[sambarhunter]

I have since found out from RUAG

The 10,3 has its own diameter which is exactly 10,51mm so 0,413 in inch.

So you can´t use bullets with .404 or .416 diameter.

This dimension is also given in the CIP-datasheet as G1.

 

[bruce moulds]

looking at chamber dimensions.
so we talk the same language, the paralell part in front of the case i am calling freebore.
the tapered part in front of the freebore i am calling the throat.
this may be incorrect terminology, so i thought i should define my language.
G1 (10.52) seems to be diameter of the freebore.
freebore is usually a little bigger than bullet and groove diameter, to allow for ease of chambering.
F (10.25) looks like bore diameter as opposed to groove diameter.
Z, i cannot come to grips with.
these are min spec for chamber.
the cartridge drawing shows max spec for bullet, G1, to be 10.51, giving a min clearance of 0.01mm between bullet and freebore.
this would suggest a groove diameter (and bullet diameter?) of 10.51 = 0.41378".
what that translates to in the real world god only knows.
bruce.

 

[Hogpatrol]

Confusing and possibly dangerous to say the least. Why they just don't call it a 10.5 is beyond me.

 

[JPbowhunter]

I hope you can get the projectiles in aus

 

[sambarhunter]

No they will have to come in.

 

[bruce moulds]

goddam.
i thought the 9.3x64 was a hard one here in oz.
bruce.

 

[sambarhunter]

goddam.
i thought the 9.3x64 was a hard one here in oz.
bruce.

Not as hard as the 10.3
i have a 100 `64 cases..the 9.3 bullets are plenty

 

[bruce moulds]

these things are sent to try us.
having the patience of a saint is an asset.
bruce.

 

[sambarhunter]

Patience I dont have in buckets,but I am forced to be ha ha.

 

[sambarhunter]

the bullet diameter is 10.51mm or 0.414", that information is from RWS themselves although the CIP drawing show the groove diameter for the barrel to be 10.49mm or 0.413".

 

[bruce moulds]

the number for barrel groove diameter would be min spec.
meaning that groove diameter is o.413 or bigger.
bullet diameter is max spec. meaning the bullet is that diameter or smaller.
maybe in the middle the two meet just nicely.
you can fire a 0.001" oversize cored bullet safely.
bruce.

 

[sambarhunter]

Need to find someone that will do a barrel for me in CM,thats the hard part..getting it reamed is the easier part.

 

[bruce moulds]

i might be able to give you some names if you p.m. me
bruce.

 

[sambarhunter]

Done Bruce.

 

[sambarhunter]

From a mate today,he advises...

LW make a barrel for the 10.3 with a 1 in 17.7 twist rate for the 10.3x60R which is the same twist rate as for the 10.3x68, in other words you can get an unchambered and unprofiled barrel from LW.

 

[JPbowhunter]

Wow i would not have imagined that would be the twist rate. If i had the money I'd be there with you on this build.

Keenly watching how she goes.

 

[sambarhunter]

The twist rate is in the CIP drawing posted above somewhere.. 1/450 mm

Find the english flag to read this. There is a specific page for the cartridge.

https://rws-munition.de/en/rws-hunt...ures-flyers-pictures-etc/catalogue201819.html