Yeah. I figured your statements were based on "published" velocities. My statements were based on actually having chronographed factory ammo in a 20" barreled 30-30 and, based on my experience and that of others, the published factory velocities are .....uh......optimistic?
Published velocities are probably taken in 26" pressure barrels, not real 20" sporting barrels, to the extent that they're not simply made up. Specs for ammo are set by SAAMI. Have you ever noticed that all ammo in any given caliber generally has the same, exact ballistics regarless of manufacturer or bullet type? Do you think that's just coincidental that they are all exactly the same?
Manufactures have always played with the numbers. When the 7mm Rem Mag came out 30 years ago the published veolicty for the 150 grain bullet was 3250 fps. Now the official published velocity is 3,050, about like what I get in my handloaded .270 Winchester with 150 grain bullets.
The .300 Win Mag's original published velocity with 150 grain bullets was 3400 fps. The last .300 Win Mag 150 grain factory ammo I chronographed in a 24" barrel was 3,150 fps, identical to what I get in my handloaded .270 WCF with 130 grain bullets and only 100 fps. faster than 150 grainers in my handloaded 30-06 Sprg. with only a 22" barrel. Was not much better with the 180 gran bullet. The 300 Win Mag with a 180 grain bullet was 2,985 fps. I get 2850 in my 30-06 with a shorter barrel and much less powder and much less recoil and much less muzzle blast. They have also dropped the published velocities for the 300 Win magnum.
Know why they dropped the published velocities? The proliferation of affordable chronographs among the masses made it harder for them to lie. That's why.
It dawned on me that 100 fps isn't going to make any difference in killing power, but the deafening muzzle blast of the magnums was going to make a hell of a lot of difference on the amount of hearing loss I would sustain when I was firing on game without ear protection. Also the 30-06 had a handier 22" barrel and five rounds in the magazine and I didn't have to worry about getting whacked in the forehead with the scope if I crawled the stock too much.
When I'm at the range, others frequently ask to use my chrongraph. It's nice to know that my 24" handloaded .270 equals factory 7mm Rem Magnums and my 22" barreled 30-06 is within 100 fps. of most factory 300 magnums.
Guess what. I have gotten rid of all of my magnum rifles except a .338 that has been long throated for 250 grain Noslers at 2,800 fps. This is 100 fps behind the other super .338's (i.e. .338 RUM and .340 Weatherby) and is as much punishment as I am willing to endure. I save this rifle for elk and moose and target shooting at the range. After the pounding of a few .338's, the 30-06 and .270 feel like toys. A great training technique. Even so, If I take the .35 caliber plunge and get a .35 Whelen AI, I may dump the .338 too.
I stand by my original statement. The published velocity by PMC for their 30-30 WCF with 150 grain bullets is about what you'll get with any factory 30-30 ammo in 20" barrels.