7mm Remington Magnum, Brian Pearce, HANDLOADER #323
Friend Allan Jones, the editor
of the Speer Reloading Manuals
No. 12, No. 13 and No. 14, reported
that “there is a great deal
of velocity variation among sporters
in this caliber.” He continues
that “Rifles in the Speer’s lab’s
collection posted velocities varying
from 400 ft/sec under to 300
ft/sec over those posted by the
SAAMI pressure barrel with the
same ammo.” While I have not experienced
the incredible 700-fps
swings in sporter rifles that the
Speer lab has, I have seen 300-
to 400-fps swings with identical
loads between Remington, Weatherby,
Winchester, Ruger, Interarms
and Sako rifles, each featuring
24-inch barrels.
Questions:
So factory loads must be pretty weak, just in case?
Treat each rifle independently don't shoot same loads in multiple rifles unless really conservatively loaded?
Barrel and or chamber specs all over the place causing this issue?
I've always read this about the 7 mag and I thoroughly trust the author so would probably be very diligent to segregate ammo if owned multiples.
Thoughts?
Mike
