Hi Rabid ...
These bullets are long and heavy, and whether heavy or not, most long bullets take more spin to stabilize the longer arm over the longitudinal axis of the bullet. There is a lot of aerodynamics involved in launching a bullet and spin seems to solve most problems in simple terms.
The shorter the bullet, the shorter the arm till you get to a round ball, which is pretty much optimum in stability with a center of gravity like... right there and only in some small way affected by air voids or other casting foibles in most general cases.
Lengthen the bullet and the arm extends, the center of gravity moves, and the nose of the bullet is also affected by where the center of pressure is and the angle of departure from the muzzle and..... ok... I'm not a physicist... I shoot bullets out of guns...
and it turns out that long bullets need faster spin, shorter bullets need less, the round ball almost none by comparison. Thats one parameter.
Bullet weight. This is another phenomena we deal with. Big weight big recoil... though it is not really necessary to pound yourself with big bullets with proper twist.
A big bullet once underway, will complete the job you started provided you got it going in the right direction to start with.
One thing nice about Thompson... you can split your stock and they will replace it....
Aloha... Tom
