its ok in the 39 havent never heard they have a target chamber but dont use in the 7000 it has a semi match chamber from what i have read, i like the fedral lightnings which have changed names now i think they are champion 510 , i love my 7000 & my 39 everybody needs 1 of each mike243
intresting i got a reply from marlin, after asking the quetion. it states simply the 7000 is Not a match chamber. i would imagine this includes the bentz semi auto match chamber. they also do not recommend hyper velocity ammo in their "heavy barrel". heavy barrel is also a tipoff. the term descibes a barrel with a sporting chamber.
39a has a sporting chamber and is OK
7K is still unverfied in chamber, i know its not a match
i dont think the barrel is what is keeping it from using the hypers. does the radius have something to do with it?