I know for a fact savage make (or made) a ML that would accept smokeless. Almost certain it's legal as long as you're still loading from the front and primer/cap are seperate from the charge.
Stute Slap wrote:The synthetic is nice cuz it's a lot less corrosive/less smoke, etc but you have to be careful shooting it as it has more punch to it - so pack it with less grains. I am currently running BH209 in a Remington 700 UML.
I don't know that it has that much more or less "punch" to it. I.e. if you shoot loose pyrodex/777 grain for grain you get close to the same velocities. You do have to load it down compared to pellets because of the absence of the bonding agent used to keep pellets stuck together. For guys that shoot 150 gr of pellets seems clsoe to equivalent of 90-100 gr of loose.
BH209 is what I mainly run although it seems like it's the most finicky to temperature/condensation issues. It also has lower ignition probability so running hotter primers and aftermarket breeches to ensure ignition is more important than say 777 loose. I do like BH209 however as I can shoot 25 shots without cleaning in between if need be.