I've recently experimented with the new line of Ceramic-type .40g WE-Tech sniper bbs, I've compared performance to the Mad-bull variation of the .40g and have found interesting results. External wise, they look identical and even smell alike, both are made in Taiwan and both claim an approximate 5.95mm bore-diameter. But, using my SVD as a medium, at 440fps, I've found that mad-bull .40gs are significantly more consistent in both inertia and grouping. In comparison, the We-Tech variants cost half as much, but come in a plastic bag as oppose to a solid container. Shelf-life is also half as good as the Mad-Bull variant, and when left in a magazine, begin to rot or shed their outer polished coat.
Overall, I strongly recommend the Mad-Bull precision series .40g bbs, I don't care you find variants that look, and smell alike, if you don't see a bull on it, don't buy it;)
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