Gary:
It is always good to take a question from my friend and PH!
Today’s fascination is with cartridges that hit harder
and go faster so it may be a surprise to many that more are not seen in double rifles of modern manufacture or rebarreled
or re-chambered in vintage rifles. However, there are five problems with this. First, the mentallity of the super magnum desire
is to reach out and shoot one’s elk, or sheep, or antelope at 700 yards. Anything beyond 150 yards is stretching it
for the double rifle due the regulation complexities. No matter how optimistic the folding sight leaves say the range may
be, double rifles are not long range rifles by any means.
Seond, is the muzzle blast and how it affects shooters. The
higher velcoity of modern magnums gave rise to the muzzle brake or porting of
some sort. Neither is conducive to accuracy in a double rifle. Besides being down-right ugly (author’s opinion) and
as far from traditional as one can imagine, muzzle brakes would destroy regulated accuracy. Also and third, they are death
to the ears of those in close proximity. In fact, many PHs in Africa will not allow their hunters to shoot with a brake.
Number four, is the pressure in the modern magnums are too
high for most doubles. Many cartridges have a pressure of 60,000psi whereas some
of the larger nitro cartridges are half that or less. Remember the British used the larger cartridges to achieve lower chamber
pressure in the heat of Africa and India (cordite was very hear sensitive). The double rifle action is far weaker than a bolt
rifle and high pressures casue difficulty in opening the action after discharge.
With the above, and last on the list, is extraction difficulties.
High pressure makes extraction more dificult and ejectors can tear through the thin rim if the cartridges sticks in the chambers.
And,today’s magnums are of a rimless design and rimmed cartridges work best in double
rifles.
I guess I should add anoher. The forte’ of a double rifle
is dangerous game hunting. Most high velocity magnums are for long range shooting and use light weight bullets. 500, 570,
750, and 900 grain bullets are for close up work and not for shooting across
a canyon in the southwestern USA. A double is for quick, snap shots at critters that can hit back and, no matter what Roy
and others say, I would rather have a 500 grain bullet at 2150fps (or a 900 grains at 1950!) rather than a 180 grain bullet
at 3600fps. ‘Nuff said!
Good shooting,
Cal