As far as shooting them in a tubular mag, your on your own. But, Speer mag tips are, by design, are made to expand at lower velocities and yet, still hold together at upper velocity limits. This is the reason I loaded 180 gr mag tips in my wife's 300 savage, to take her 1st Wisc. blackie, no complaint on bullet performance. To be sure you could call them and ask or try them in a test medium, just my 2 penny's. CRASH87