20BR Load development

[force64]

My current stock of home loaded 32 gn vmax coming to and end and with no more Varget it was time to do some more load testing.

I sourced some 39gn sierra blitzking to try in addition to the usual 32gn vmax.

Loaded 5 x 4 rounds of the 32gn vmax with N135 starting at 28.0gn increasing in 0.5 stages up to 30.0gn.  

Then I loaded 5 x 4 rounds of the 39gn blitzking with N140 starting at 27.5gn increasing in 0.5 stages up to 29.5gn.  Both sets loaded 20thou off lands.  Targets set at 100 yards.

Drove down to farm and despite it being rather windy (20mph gusts) and with the rifle on mounted on the Landy bonnet I achieved the following which showed a very significant liking to the Blitzking.

32gn Vmax and N135                    39gn Blitzking and N140

28.0gn  1.024"                               27.5gn  0.835"

28.5gn  1.466"                               28.0gn  0.633"

29.0gn  1.181"                               28.5gn  0.548"

29.5gn  1.033"                               29.0gn  0.448"

30.0gn  1.180"                               29.5gn  0.523"

Needless to say will reload a few more of the 39gn Blitzking with 29.0gn of the N140. 

Picture of best group and set up below.