Thread: Overpressure signs on Belted Mag

@Vandros I ran a 7mm Mag for 3 yrs back in the late 90's, l brought off another guide while l was in the US, so can not offer advice on current powders/bullet choices but the universal " Yank Deer Slayer" load, that with the popularity of it back them would take truck loads of Deer every season, was a 160gn bullet going around 3100fps out of a standard 24 inch barrel ,l settled on the 160gn Speer Grand Slam & the 175gn Speer for Elk & Moose going just over 2900fps, took a lot of game both here & in the US with it , but my favorite Kiwi Hunting load was the 140gn Nosler pushed to just under 3300fp,never having any need to red line it. These loads all shot to easily tracked POI with the 160/170gn load printing around 75 higher than the 140grn zero of 64mm high at 100 meters & the 160/170gn loads basically grouping together .


A lot of 7mm"Mags" quickly burnt barrels out or worse by people trying to push them too hard & come unstuck mixing components ,that is the reason reloading manuals use to vary so much for them .I do not know whether it has changed now but the cases had a lot of variance between makers & this got a lot of people in trouble ,from memory Norma cases use to hold 10grns more powder than the makers cases with the least case capacity.

Here is a good article l have kept & it pays for everyone to refresh their brains on from time to time while reloading .


Understanding Pressure




Understanding Pressure :: Primal Rights, Inc