I've been meaning to post this theme for a while and get your feedback as to what is real-world velocity increase due to some efficiencies (better case, powder, bullet, throating etc.) vs what is "no free lunch" and not worth the hassle.

I frequent other forum sites and there seems to be multiple emerging ways claiming significant increases in cartridge velocity:

1. Using Gunwerks or ADG brass- more case capacity? combined with RL23 (some claim other powders like RL26) to achieve 3300 fps out of a 300 Win Mag using 181 gr Hammer bullets. This seems very high and no powder charge was listed only velocity increases.

2. Using "Absolute" bullets from Hammer Bullets to get higher velocity. Claims of 300 Rum velocities from 300 Win Mag. and 300 Win Mag. velocities from a 30-06.
Originally Posted by https://hammerbullets.com/product/308-cal-178g-absolute-hammer/
Absolute Hammer we saw velocity gains in the 30-06 that puts it in the 300 Winchester Magnum performance class. When tested in the 300 Winchester Magnum the velocity gain put it squarely in the 300 Ultramag class.


3. "+P Throating": Claims, that with special patented barrel treatment can, depending on cartridge, gain 100+fps more velocity: "...can help you get more velocity out of your standard chambering." Video link here: https://defensiveedge.net/what-is-p-throating/

Have any of you experimented with these or are you familiar enough with the concepts to share an opinion? Generally, is accuracy adversely affected at all or rifle/load dependent? I'm curious and want to learn something new. My initial reaction is that you cannot achieve more velocity without more pressure (which at some point can be dangerous) but that is only part of the overall picture since there might be ways to be more efficient or lower pressure to get more powder in the case etc...and to state the obvious, extra velocity is only useful if accuracy come along with it.