Alright Ford, with your novel suggestions, I think I have overcome the case splitting issue. The key is to get the sticks of Bertram Brass quite colourful down to about 9mm from the top of the base of the stick of Brass. Now it still appears that if there is the slightest crack in the case. from a previous shot, the case will crack even further. I try to find all the cracks on the cases, that came with each gun, in the brass with my fingernails & then mark them w/ a Sharpie to see what happens.
I took a couple sticks of Bertram Brass, Aluminum Pie Plate and a cup of water, along with a hand-torch(not flashlight). I marked the cases @ 9mm up from the top of the Base and set the cases vertikal in the Pie Plate. Next I filled the Pie Plate with water up to the marks. Then a Brisk Torch Effort trying to rotate around the cases from the water up to about 1" from the Base. It takes a time or two of tippin' over in the water before that colourful pattern appears.
And I have done some off-hand shooting thru a Chrony.
27 Grains of VV N140 nicely fills the case & along with a 130 grain Cast Lead Bullet w/ Gas Check nets an average velocity around 2250 ft/s in the O/U Springer.
For the exact same Load with a bit more effort in resizing after loading, the Bradler & Lachmann in Graz Borovlje Cape produced an average velocity of 2300 on the nose.
So now I can start to load for each 6,5X70R Platform & there individual idiosyncrasies.
Hochachtungsvoll,
Raimey
rse
