.375 Ruger for the .280 Ross?

Baribal

Baribal

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Anyone tried it?
This should be much easier than swaging down the .300 RUM of removing the belt and trimming any belted magnum....
I still have a bunch of ready brass here but I think I will give it a try quite soon....
 
Yes. If the belt is removed, the case is still going to expand foreward of where the bolt was.
How does the head diameter of the Ruger case compare with an original Ross?
 
That's the reason why I swage down 0.015" on the RUM brass...

The head is 0.532" and the rim is the same. The lenght is also interesting; 2.580".... Once reformed, with the taper angle, it should be quite close to the 66.32mm (2.610") of the CIP standard.

The Ross "supposed to" being (13..59mm) 0.535" at the base, it's all set for a very good match. Now, I don't know what the base of the virgin .375 Ruger brass is, but all the orignal .280 Ross (Kynoch, USC Co, WRA Co. and DC Co.) i have are around 0.529" to 0.531"...

Anyone can measure the base of brand new, fresh .375 Ruger?

I am also planning on swaging (bounce UP) the .284" bullets. Later this summer, I will have a end-mill and a reamer made for it and make a three piece swaging die.
 
Baribal said:
Gatehouse, do you have any unfired cases you can measure for us?
Click to expand...

Well, I'm not Gatehouse but...

the 1/2 dozen new, unfired Hornady cases I measured had a base diameter range of .5275" to .529". The rims seemed to be very slightly smaller - about .0005".

Measurement was done with a Canadian Tire digital caliper.
 
Well, that quite enough... CT or not, it's a good start. I don't worry about the rim dia too much, any other mag brass, including the RUM will be smaller than the .280 Ross, but the extractor is plenty good, and the brass much tougher than the orignal.
Thanks a lot, Mauser98

So, my thought was right. Now, one of use will have to resize some brass, wich will surely need less arm juice than swaging the RUM...
 
Well, I did one more crime. I fired some of the "youngest" original Kynoch (I got plenty enough) through my M-10 just to see what the expansion would be. Never done that before, I always shot resized brass through the rifles.

As when reformed from belted mag brass, the brass came out a bit deformed, a bulge over the base is clearly visible.
The original diameter just in front of the base (where the head ends, or, where the wall starts) was 0.520" and after firing it is 0.535". Quite a bit of expansion to me. Even with what I do consider a lot of expansion (case headspace, shoulder), the fired brass is within CIP's standard for the .280 RNE...
That means the .375 Ruger will be the perfect brass to reform.
I will wait a bit until the .375 Ruger brass will become more availlable in my area and then try it.
 
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