I just got a new unfired for the last 25 years or so Colt New frontier 44 spl. I measured the throats at .433 and was bummed out as I thought it would be very inaccurate due to oversize cylinder throats. I was even considering a new cylinder made to fit. Well I go to my range after work today and find it shoots 1 to 2 inch groups with several different loads at 25 yards. So much for everything i have read. The bottom line on a sixgun is how it shoots. It might shoot better with tighter throats but I cannot. 8 grains of power pistol behind a 250 lyman 421429 is a tack driver(cci 300 primer). A commercial magma 240 grian bevel base swc with 5.5 grains of 231 was also a great grouper (6 shots in 1 inch).