If the bolt is lifting hard then the pressure is too high!!!! High pressure is where the short mags get the claim of equaling bigger cartridges. For example the 300 WSM is loaded to 62,000 PSI and this load is compaired to a 300 Winchester mag loaded to 52,000. All things being equal such as barrel length and such case capisity rules for velosity. The only way to increase velosity is to either go to a bigger case and add powder or to increase pressures. A good example of this is the .450 # 2 NE and the .458 Winchester. In the .458 you have to stuff in somthing like 69 grains of IMR 3031 and compress the hell out of it to get around the 2,000 FPS range and you will have around 45,000 CUP. In the .450 # 2, 90 grains of Rl 15 or 100 grains of H 4831 do not even come close to filling the case as a matter of fact you will need some type of filler, velosity will be around 2100 FPS at 25,000 CUP or less.
One more point, as pressure goes up so does tempriture so I will be intrested to see how the short mag barrels last compared to their big brothers.