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
The 7mmRM exhibits a lot of pressure variation (AKA pressure spikes) from shot to shot even in SAAMI pressure bbls. That is why twice in the 1970's Remington lowered the powder charge--and consequently the advertised MV--in their ammunition.
In 1970 MV with a 150gr factory load was advertised at 3260 fps,, by 1978 was advertised at 3110 fps.
