quote:

Originally posted by brianw:
I dont have any data using Viht N170 or N560 in a 7mm Mag or 7mm Dakota, but I have used both powders in other cases.

I have listed some of my chrono data in my 25/06AI to give a comparison of Viht N560 and N170 with other powders.
25/06AI (71 grains capacity)
100 grain Nosler BT
61.0 grains Viht N560 - 3484
62.0 grains Viht N560 - 3566 (Max)
61.0 grains Re22 - 3501
62.0 grains Re22 - 3580 (Max)
62.0 grains N165 - 3499
62.0 grains N165 - 3562 (Max)

115 grain Nosler BT
59.0 grains Viht N165- 3305 (Max)
61.0 grains Re 25 - 3218
62.0 grains Re 25 - 3293 (Max)
63.0 grains H1000 - 3271 (Max)
63.0 grains Viht N170 - 3202
64.0 grains Viht N170 - 3286 (Near Max/Max)

I recently tested Viht N570 for the first time, and had read one report that it was slower burning than Viht N170, but my testing with N570 in my 257W found it to be slightly faster burning than N170.

Hope that the above is of some help. Brian.