Slugs in a .22 M-Rod

You need ALOT of power to shoot anything with a jacket. Powder burner power. The jacket causes way too much friction and won't make it out the barrel most likely.

As for slugs out of the stock barrel, not sure. Theyre choked which isn't the best for slugs. Try some .217 or .218 sized slugs. NSA has a bunch of different options for 22. Slugs are touchy, a .217 might spiral and shoot like crap out of your gun, but a .2175 will stack in a dime at 75. The best option is to slug the barrel to see what size you need vs spending a bunch of money on what ifs.