Re: 7mm Hart and 30 Hart
Here are some 30 Hart data out of 27" Hart barrel for comparison.
81.3gr VV165, 180 SST, F210 3218fps, ES 27.6 and SD 11.1 bullet jump of .080
84.0 gr RL22 (slow lot) 180 Sierra spitzer 3457 fps
Considering the shorter barrel and 20 gr less powder, it does not give much up to the RUM, but can still get a standard 300 weatherby with 180 to around 3200 fps and that is w/o fireforming and much better brass.