Originally Posted by LouBoyd
The SAAMI spec cartridge length of the 300 Win Mag is 3.34". Winchester has historically manufactured the model 70 in 300 Win mag with a magazine to fit that length but not much extra. The Rem 700 uses their standard "long action" for the 300 win mag which has a 3.6" magazine.
I have a 300 Win mag Larado model which has good accuracy with factory ammo. I also have a Rem 700 Sendero, which can shoot heavier VLD bullets with handloads with up to a 3.60 cartridge overall length. That allows both more usable case capacity and higher ballistic coefficients. That results in longer range, more delivered energy, and lower wind deflection.
So my choice is ... both.
I'm thinking a properly fitted Wyatt's Extended Box Magazine would solve the magazine length shortcoming. It might even allow a fella to re-barrel to a RUM cartridge, if desired.
Of course, you can shoot with long bullets loaded to whatever OAL you like if you don't mind single feeding.