bwaites Wrote:Multiple sources now report that SAAMI II chambering for the 6.8 SPC and the associated ammunition does not safely provide the upgrade that the SAAMI II advocates have promised. In fact Dr. Roberts has stated; "Every professional ballistics facility, including USG, foreign military, and Industry, that I am aware of that has tested 6.8 SPC vs. 6.8 SPCII using industry standard equipment has reported only a 1000-1500 psi change." This is confirmed by Johan Loubser at AA/Ramshot powders; "Yes we did exactly that and the difference was negligible as to be ignored ca 20-30Fps and <1000Psi."I'm not sure why you're discussing 6.8 SPC, but I must comment.
So the SpecII chamber simply doesn't give the advantages proposed.
In the testing cited, they used only a special SAMMI test load, which makes the results much less than definitive or conclusive.
SPCII ammo (such as SSA Tactical, and Wilson Combat) has not been tested to see what would be the effect on pressure and velocity in SPCII vs SAAMI chambers.