The Lehigh Max expansion should be perfectly stable in a 1/8, maybe even a 1/9, as far as baffle strikes are concerned You will down range wobble sooner than something like the 240 SMK, but probably farther than you would be shooting. It’s just a good example of why you test without without the suppressor on first.
The Lehigh is fun to pick on because it also fails at high speed, twist. Around 1250 fps in a 1/7, they start opening up in flight.
Other than a few specialty bullets you won’t have any trouble with a 1/8 and stability, or bullets coming apart.nthe cartridge is a bit self protecting. For spinning something apart, hard to do in 1/8 that’s 10” long. It will be hard to get any thing over 2400 fps. That’s a spin rate of 216,000 rpm. That will be a pretty hot load for a 110 grain bullet. As bullet weight goes up, they generally get longer and limit maximum powder charge weight.
Just always confirm, no matter how many people tell you it will be fine. I’ve had bullets the should have been more than stable, numbers in the 2.2 range on calculators. Alloy was too hard and the bullets wouldn’t seal the bore. Had flyers and occasional keyholing. Crank the peak pressure up to about 55- 60,000 where a normal rifle would shoot, and the problem went away. The base of the bullet was being gas cut and there was an uneven push out the muzzle.
Lots of kinks shooting subsonic, a lot of fun and you learn a lot about internal Ballistics, that not to many write about.
If you pick your bullets right, those designed for the purpose, your weight range will be 150-265 grains.
Since velocity will remain a constant, the only way to add impact energy and terminal energy is to add weight, or stop it faster. But if you stop it too fast, you have no penetration. Lots to balance. It’s fun
By the way I keep a magazine of the 194 ME’s around
