One of my favorite Remington 7MAG load is: 66.0/IMR7828/Fed215/Win/175SBT (Duponts MAX load with 52,000CUP listed with Remington cases and bullets and I've used other brands of bullets and cases without a problem in MY RIFLE!). My second load is 40.0/IMR4064/WLR/Win/175SBT (this reduced load "clocks" 2220fps out of a 24" BBL and shoots POA @ 100yards and makes the 7Mag fun to shoot). My 160gr loads use IMR4831 and RL22 powders seems to be the "favorite" weight of most 7MM "shooter" and "hunters".
My rifle is a Weatherby Vanguard Classic II with a "generous" chamber, but no "freebore". If the powder capacity of the Remington 7Mag case is compared to the 7Mag Wheatherby case, they are almost identical. What is NOT identical is that 7Mag Weatherby cases are loaded to 54,000CUP and most of the rifles for it are freebored, whereas very few of the Remington 7Mag rifles have been freebored and the pressures have been reduced to 30/06 pressures in the last "decade". Loaded to the same pressure levels in a "strong bolt" gun, there is little, if any, difference of one over the other if the same barrel length is used. If you check Mr. Hagel's loads in his books, most of them are "over", or least on the "high side" for all or most of the calibers he's lists when checked with current reloading manuals. (While I hold Mr. Hagel in very high regard as a writer and hunter, I use his reloading data very cautiously, indeed!) He wrote extensively about the 7Mags and .340Weatherby and seemed to favor the Weatherby rifles for their strength.
Of late, the Remington 7Mag has fallen "victim" to the "marketing spinners" (IMO) of the new "short magnum genre of calibers" to show the new "smaller, "beltless", short magnum" cases to equal the longer cases while using more powder while producing less recoil in a lighter rifle
. Whether the issue "that the Remington 7Mag has a case, pressure problem" is a "factoid" overcome by the new "beltless wonders" or not comes into "question" when one considers that this same Remington 7Mag case houses the .264WinMag and .338WinMag (the "creme de la creme" of the "gun editor's" caliber for "ilk").
While I like the Remington 7Mag (obviously), I would not own one unless it was subperbly accurate in a rifle I really like. Why? Because it will not do anything that a "properly loaded" 30/06 will accomplish while producing less "noise", using less powder, and in a "handier" rifle with a shorter barrel. This, admittedly, "biased opinion" does not "negate" its usefulness or effectiveness in the least. I don't normally load 140 and 150gr bullets for the 7Mag case very often for the same reason because I have a .270 in a much "handier", more efficient case using bullets of this same weight. However, loading a favorite 7Mag can make it suitable for any game you may want to hunt in the North America continent and "bridge" both of these calibers easily. It is one "metric" caliber that was a "magic caliber" back in 1962 when "short" calibers like the .308 were not "special" and the 30/06 was "old hat".