got a PM from pato about the 10,75x57 die set from ch4d. finally it arrive two month ago and I am very satisfied with the quality.

Dave must have made something between 2 and 5 die set's for the 10,75x57 before but had interest to hear my chamber dimensions.in the end it was clear that my rifle was within his measurements.
the best brass is 30 06 but I have also work with 7x64 case's. don't having enough 30 06 brass at home I bought 160 once fired Norma cases and very cheap compared with 160 10,75x68 case's.

1. 30 06 Norma
2. resized with 9x57 die
3. with 9,5x56 die
4. with the 10,75 neck expanding die
5. full length resizing die
6. cut to 57 mm

step 4. was going very well for 20 case's till I had first cracks. The whole lot was annealed and I made a .400 neck expander. this is the critical diameter when the neck will crack or collapsing.

loaded with the die set:

1. once fired case as 10,75x57 with 300 grain lead bullet
2. new formed case with 240 grain Rem soft point
3. once fired case with 300 grain's Speer soft point

you can see that also 30 06 brass need a fire forming to becoming a 10,75x57.
all bullet's are pressed down to .424 in a home made die with my rock chucker.