In my older Hornady (3rd ed) the powder for best results is H450 but as that is no longer available I was wondering what the collective wisdom would use instead. I had used the 139-140gn bullet in my previous 7x57's over Varget but have just finished a custom with a 25in x 9in twist bbl and had it throated to suit the heavier bullets. I have exceptable loads for the short to medium range but want to use the 168gn berger for a bit of stretch out work and using H4350 it runs out of the velocity - accuracy window at 2558fps for 3/4in at 100yd. I have two burn rate charts and one shows Rel 19 and N205 and the other shows IMR 4831 and N205 as being similar burn rate. The question is has anyone who had previously used H450 found a equaly well performing substitute pwder. If there is someone who has data for H4831 that performs better than H4350 that would be ideal for me as sourcing some powders here in New Zealand are easier than others. Gratefull for any insights. Von Gruff.