When I size my bullets through the .310 sizer (NOE, push through) and crimp on the Hornady checks, it requires quite a lot of force. I noticed there was typically a tiny extrusion somewhere from the base of the check, typically reflecting the position of the bullet punch. I could probably solve the problem by sizing in steps. But i have enough pulls of the handle, as it is
So I wanted to try out my aluminium checks, made with Pat Marlin checkmaker, and 0,3mm (=0,012in) aluminium. These crimp on effortlessly, with even base.
Tested the Vectan tubal-3000 further today (with these, and other bullets). This seems to be a seriously good powder! Absolutely clean, which means I could see no new layers of grime. Just a couple of 5-shot groups today, mostly to see if there was an obvious drift in sweet spot with the new checks- it wasn`t.
Rössler titan alpha .30–06. Norma range pick- ups, neck sized (8th), expanded/flared to 1 thou bullet grip. Left the flare. Win LRP. 28grs tu-3000. Jam fit. Shot @100m, prone, support on bag with 10x scope.
The best group (3/4 MOA) was with the aluminium checks. A couple of 5-shot groups proves absolutely nothing, but I will definately try this load again. 3/4 MOA 5- shot group pretty much reflects my limit as a shooter, with a light hunting rifle from this shooting position.
PS target looks different than the others because I used a zoom-function on the target computer. Ah, progression!