While MC feels it is just slightly faster than an old o6 the one load I cronied was slightly faster, it pushed a 150 grain at just over 3400fps..
that load may have been a bit hot I haven't had time to determine that yet...but look at the record..in the 30's the .300 h & h won the cup at camp perry, the 06 has not won the cup since that win by the h & h...I have heard this all my life, it was started you .270 O'Connor that the H & H was just a bit more than the 06... Even O"Connors life long pal John Jobson another .270 lover, finally bought a 300 H & H AND SHOT IT...I will always remember his comment about the 06 and the .300 ...it was to the effect the .300 out performs the 06, like a jaguar goes around a dump truck....
Boddington took a custom 300 on a desert sheephunt several years ago..the handloads kicked along a 150 grain serria at over 3400 fps...no 06 can do that..I had another pal who loved the H & H his would also kick along the 150 at 3400 fps.+ So until you try something, don't believe all the stories out there by folks who never shot anything extensively but an 06....There are dozens of better rounds out there than it...I had a .300 rebarreled this fall and shot one antelope and one whitetail with it.. both were at longer distances over 300 yards, and in both cases the animals did true bang flops, they fell on the spot...I will not say this happens everytime, but it is a deadly round...More testing will be required to find just how fast it can safely be loaded for my rifle...I like all .300's the only one I haven't had is the .30-378. Maybe someday, but they all are step above the 06 like it is a step above the 30-30...while new loads have improved the 06's performance some, they have also been a[pplied to the 300's so there is still the gap in performance...not everone has the need, desire, or interest to shoot a .300 but as far as performance, if you can shoot them it is noticable...I was told that 50 years ago by my neighbor who was an old Camp Perry shooter...He liked the 06 and .270 also, but when I quoted O.Connors remark about the .300 being just a bit better, he said He had SHOT one and it was noticably better..my first hin t old Jack was not alwaysright...One final thing several times when I was teaching and elk were important to the meat supply we hunted a big open mt. were they came out to feed late in the eve. the shots were always long, but at standing animals, and when hit they rolled DOWN HILL making getting them out easier...Several times I had a friend with me when the elk came out...He just shook his head and said too far for my 06, for my 300 it was an easy shot.....we ate elk, he ate beans.....