hoenstly i dont know much about primers, other then what they do. if there is a rating for hardness or quality, thats something im not sure about. mentioning that NEF stated , winchester had hard primers, reminds me of a post that said remington had them too. see, 35whelen rounds that can be readily found at gunstores and marts are made by remington primarily, so the majority of whelen owners shoot them, unless they reload. not that i doubt what you say in the least, but when i read " they ( NEF ) did mention that Olin/Winchster has had a reputation of hard primer" .. this has me wondering if they dont say that as a catch all. there is a caviat here, pointed rounds ( for semi auto use ) uses harder primers, so as to not have a round fire in the mag tube. some guns/ammo's get around this by uses flat nose bullets ( think marlin 30-30, 336 lever action ).. so maybe makes use harder primers for all of these, they dont know what round will used in what gun, marlin giude gun in 35whelen, or same round in a NEF single shot. i dont know why NEF cant beef up thier hammer strikes anyhow. dont let this issue, put a bad taste in your mouth for NEF's. they have thier quirks yes, but they are a great product at a good price.
but your talking a ML here, what primers are you using to have this issue ? winchester 209's, what type ? i use remington cleanbore's in the green box
i would say that the CCI ML primers will end up being a more relialable choice, all be it , not as clean in my experience.
my huntsman setup, i use the remi cleanbore's with teflon tape on the breech plug threads to ensure removal later, lol .. after haveing a problem removing the plug using CCI's in the white tin. my huntsman was a package, with a sb2 reciever and a .243 win barrel, factory fitted, my firing pin is the smaller rifle style, not a shotgun style, not sure if that matters or not. i also removed all the sights, replaced the screws with plugs and mounted a shotgun scope on it. ok ive went on long enough..
glenn