Igorrock:

I can get 2900 fps with the 286 gr. bullet in my 9.3x64 Newton...the rifle was formerly a CZ 550
in 9.3x62 that I had my gunsmith convert to the more powerful 9.3x64 Newton as described above.
I have to do more "experimenting" with my loads...I only did some, then am handicapped as I had
shoulder surgery (rotator cuff) surgery & am still recovering & not strong yet to handle the weight
of rilfes...I have about 3 more months recovery period.
My .416 Newton was similarily made...using the .35 newton reamer for the case body, and a .416 neck
reamer for the .416 caliber. Performance & load data is similar to the .416 Taylor.
The .450 Newton(I chose the British ystem of caliber) is actually a .458. The performance of this
one really surprised me as it is as powerful .458 Lott! With a smaller case , and very slight
shoulder, the shoulder is minimal but it works fine! All cases are not belted, of course.

Best Regards,

Tom