Hi folks,
I want to thank everyone for their help with my continued pursuit of that elusive temptress known as consistency....
As you may recall I shot a OCW test last week, using BL-C(2), 70 grain Berger VLD's and virgin Lapua match brass, and after some awesome input in my other thread, I selected 25.4 grains for further development.
So I started to play with seating depth and found that I got the best grouping when seated the rounds somewhere between .010-.015 off the lands. (Varying neck tension affects my seating depth)
Today I had the opportunity to have someone fire these across a chrono for me, and my results are deplorable.
Using once fired lapua brass, CCI Benchrest primers, 25.4 gr Bl-C(2) and the VLD's at .010 off the lands I got a spread of 118 and SD of 42
This the specific order
1 2841
2 2928
3 2881
4 2890
5 2871
6 2948
7 2959
8 2919
9 2861
10 2844
The mean is 2894.
Is this anything other than a neck tension issue? An annealing setup is my next big purchase, which I hope will allow me better control as I move forward.
I'm sure there is some variation in terms of charging, but given that I'm using a RCBS charge master, that I have "tuned" as recommended and anything better is beyond my means theres not a whole lot I can do about it at this time.
I'm using an unmodified forester FL die for shoulder bump (I got about .003 this batch, aiming for .002 or so)
I also use it to decap and expand.
Thanks again for the input
I want to thank everyone for their help with my continued pursuit of that elusive temptress known as consistency....
As you may recall I shot a OCW test last week, using BL-C(2), 70 grain Berger VLD's and virgin Lapua match brass, and after some awesome input in my other thread, I selected 25.4 grains for further development.
So I started to play with seating depth and found that I got the best grouping when seated the rounds somewhere between .010-.015 off the lands. (Varying neck tension affects my seating depth)
Today I had the opportunity to have someone fire these across a chrono for me, and my results are deplorable.
Using once fired lapua brass, CCI Benchrest primers, 25.4 gr Bl-C(2) and the VLD's at .010 off the lands I got a spread of 118 and SD of 42
This the specific order
1 2841
2 2928
3 2881
4 2890
5 2871
6 2948
7 2959
8 2919
9 2861
10 2844
The mean is 2894.
Is this anything other than a neck tension issue? An annealing setup is my next big purchase, which I hope will allow me better control as I move forward.
I'm sure there is some variation in terms of charging, but given that I'm using a RCBS charge master, that I have "tuned" as recommended and anything better is beyond my means theres not a whole lot I can do about it at this time.
I'm using an unmodified forester FL die for shoulder bump (I got about .003 this batch, aiming for .002 or so)
I also use it to decap and expand.
Thanks again for the input