magazine length

New build questions on Long Action M5 bottom metal. Read over some other threads but couldn’t find an answer so started this thread. Long Action Hawkins hunter mags are proprietary and only work with the hunter bottom metal. But the Short Action runs both AICS standard mags and the flush...

LRH Members, Please Help! My father in law is interested in building a 6.5 PRC. I do not know a ton about the cartridge, but it seems pretty intriguing. One question, can I build this rifle on a standard SA Remington 700 hinged floorplate? Or do I have to extend the magazine? He only wants...