175 gr Nosler RDF bullets

[Calfed]

I got some good results with the Sierra 175 match, picked up in bulk.

A shade under 1 MOA. Deep seating was what worked. Have to look up the COAL I set them to.

I've used them also...2.855" COAL in my K31's; 2.925" in my 1911's. I'm interested in seeing if the RDF's will be closer to the GP11 COAL

[CINDERS]

COAL works if the Meplats are all the same they can vary 5-10 thou but I guess if your shooting military then the variation is not so critical, I set up a dummy 303 SMK 175gn for all my 303's and just leave the die set to that.
I have also compared the readings between the "Nut" and Hornady ogive set and there is a good variation between the two obtained ogive measurements use one or the other.
Lastly check your batches of projectiles as what Berger did and we never heard a whisper of it but why would we being below the equator therefore we do not exist is that Berger bullets moved the Ogive on the 140gn VLD 6.5mm projectiles and if you have a old batch say with a 30 thou jump measured on the old projectile and you seat a new one then your going to end up with a 4 thou jam.

Old 6.5mm Ogive measured with the Hornady ogive comparator .736" new Ogive measurement .770"

500 6.5mm RDF costs us $350/Au here in West Au, Berger 6.5mm VLD 140's will set you back up to from some suppliers $77/100 + postage but are a bit lower priced from others down to $72/100

[Wernher von Beige]

For an interesting bit of data, somebody with a loose GP11 bullet should measure the diameter below the cannelure groove, and above it.

You will observe something unusual.

To my knowlege, no other bullet has that.

They do it for a reason. (What? Heck if I know -- I have some guesses, but they're just guesses -- the Swiss do everything for a reason and are rather proud of not copying anybody else).

I don't bother to handload GP11. At 52 cents a round, delivered, not too long ago, I stockpiled. I can't reload for that price.

[Calfed]

My sons and I shoot Swiss rifles in vintage military rifle silhouette matches where no FMJ bullets are allowed. Reloading 7.5 x 55 is a necessity for us.

[RC20]

I did pull apart a GP11 round, measured the powder (48.3) and examined the bullet.

There truly is nothign like it (sand the RDF maybe and I have not seen one)

I can see why I would have problems as I assume the rifling profile per Calfed is unique to that profile.

As no other profiles are close, I believe you can only experiment.

I have used the GP11 gullet to see how it compares to lands contact vs how far set back. My test setup is not accuracy meaning true contact so I have to put one in a dummy round and test it. As its .050 measured and the contact is further out than that on other rounds, I believe .070 to .100 will be more accurate actual contact when I do the dummy frond and bolt closure test. .

I did have it shooting and its gone off again. The GP11 were not as accurate one I was dialed in with the stock screw setting but pretty good (1 1/4). I only have 9 left so am saving those!

I have duplicated the load (R17 and a comparison amount of 43450) and have a range of test round ready to go again. First one will be out as far as GP11, the rest are set way long and I will adjust to a longer COAL if the rounds don't work and see if there is an improvement going closer to the lands.

Last step would be a big jump further out.

[Calfed]

Any updates on your range tests, RC20?

[Pierre]

My range tests spread over a span of 48 years working almost exclusively with Swiss Rifles. A range test that includes the GP11 and the Berger 175gr VLD only begins to show their superiority beyond 3 to 500 yards and further.