The 7mm LRM is on the 375 Ruger case and the 28 Nosler is on a shortened 7mm Rum case ..... both glorified to run in standard 30-'06 length actions at 3.340" but are handicapped by shoving the heavy 7mm bullets deep into case reducing case capacity needed to make the long arse high bc bullets fly, in order to run the 195's in these cases the bullets seat with bullet ogive in case neck, leaving an exposed rim of the case mouth to get deformed/bent ........ Both are great cartridges but to make them really shine you need to throat them properly and run them in long actions with minimum cartridge oal @ 3.650" , at least with the heavy bullets, with the usual 150-140 gr bullets you don't have that problem but for true long range those bullets are useless when compared to the 180 and 195 gr Berger Hybrids
The 7mm Long Range Hunter (7mm LRH) is a wildcat I developed off the 338 Norma Magnum parent case dedicated for long range type of bullets like Noslers ABLR, Berger Hybrids, Cutting Edge MTH, MTAC and the custom heavy RBT's.... It does not have the "30-'06 length" castration even though the case is shorter than the other two, it's fatter at the web and I imp'd the top of case to gain more capacity,
With the 195 gr Berger Elite bullet seated for zero impact on case capacity the cartridge oal is still only at 3.530" .... With the 180 Bergers oal is 3.507", the shorter , fatter and longer neck case has 8-10 gr more usable capacity than the other two and works exceptionally well in Accurate Mags ...
Cases are easy to form from 300 Norma or 338 Norma Mag case by cream or wheat fire forming or with a hydraulic water die from Whidden Gunworks, check out the video on Whiddens website for more info ......
Developed for long range hunting so all the concerns of the overhyped and abused term "overbore" mean absolutely squat !
