ive noticed of late 2 trends .. firstly the ever de-creasing bore size [sleeving down to 23mm now from nick]
and ive also spotted daves work from stroking a [i think] 30mm chamber to something around 45mm
and that got me wondering which is best ?
my innitial thoughts are thus........
a narrow bore and medium stroke should give better flow to [and through] the transfer port....... all the pressure and turbulence is directed from a much narrower band toward the port, this maybe great for efficiency ? !

but....... on the other hand, a 40 something mm stroke [despite having a larger bore] should give a rediculously fast lock time...... reducing hold sensitivity hugely ?
so i guess the question is, which direction is favourable in terms of muzzle flip/recoil reduction ?