ako rin, kom Han$, parang nalilito rin ako.
eniwey. . .
the theory is, mas maganda haplos sa bb nung half-moon shape ng H, fishbone, or shark nub, as komrad trebor said.
however, note that pag matigas ang bucking, hindi masyadong natutulak nung nub so at certain settings eh diretso pa rin ang porma nung parte ng bucking na lalapat sa bb. try it, komrads, push the nub down and look through the chamber (or take a pic).
this is why, i think, some peeps like komrad stan of 1AD, get good enough results with ordinary nubs and standard buckings that they have sanded a bit. numinipis ung bucking. nagiging mas pliant.
i know that mastah rambo has reported very good groupings with his AHNE and a standard bucking, IIRC. the institutional wisdom, however, is that you should use a specific bucking for a particular type of nub. mas pliant, mas maganda. probly why using the stock ACM bucking works well (kya lang, madali syang maupud

)
this is the reason, probly, why some have experienced mixed results with their H nubs -- you also have to tune the bucking to the nub.
dagdag konti fps, kom SE, dahil napipigil ung bb until the very highest pressure (remember: mas sapo ng bucking ung bb kaya mas pigil ang pagalpas nya) when the bucking cannot hold the bb back anymore. theoretically

and provided, siempre, that you have the proper balance between the spring, the cylinder volume, and the inner barrel volume.
pamparami ba ng sakit ng ulo, komrads?