Quote:
.275 (Rigby) is actuallly the Standard System measurement of the diameter of the lands. The diameter of the grooves is .284, which is much more recognizable as 7 mm.
|
We typically call that the "bore diameter" rather than the "lands diameter". The other critical dimension is the "groove diameter".
All 7mm rifles actually fire 7.21mm bullets. The only rifles that fire real 7mm bullets (.277") are the 270s (Winchester, Weatherby, WSM, etc).