Re: 7mm Rem throat length/freebore???
Years of hand loading for the 7mm Rem mag here, with several different rifles. Most let me seat the bullet well out. One Win 70 had a pretty short throat allowing factory length cartridges only.
The longest throat was on a very accurate Sendero I owned for a few years. That thing was very, very accurate and capable of rather high velocity too. Impressive rifle. Too bad I had to sell due to hard times financially.
Any gunsmith worth their salt can add a little length to the chamber if you want, allowing you to seat the bullet out farther. That works really well. Actually gives you more powder capacity to play with... Of course then you're pretty much on your own to determine what constitutes a max load, because you're no longer playing with a factory spec chamber.
Some impressive results can be obtained.