Most barrels chambered for the .303 Savage are .308" groove diameter but some are as large as .310" requiring the use of .311" bullets. Read more
Every rifle is a law unto itself, not only as to the loads they'll digest, but dimensionally too.
Used with a 45gn bullet in the .22 Hornet, it gives about 150fps more velocity than factory rounds.
The CZ 457 Jaguar seems to have an unusually long 28" barrel.
if the rifling was given a left-hand twist for Northern latitudes, it would somewhat correct for C.A drift.
While it's true that a "crush" fit will eliminate excessive headspace and prolong case life, it can be a problem if it's overdone.
The body grooves on Barnes Triple Shock bullets reduce the frictional effects.
I don't need any more magnification for game over normal field ranges out to 400yds.
At longer ranges, or any for that matter, there is almost a 5-percent error between inches and MoA