Here is an answer to some questions I had direct from Dave at Lehigh Defence:
You can shoot any of the .308 subsonics in any .308 cartridge at 1040fps as long as the barrel twist is 1:8 or faster. I guess there are a lot of Tikka's there in 1:11 twist and none of our bullets will be stable there. The 02-308-170-LP, 170gr Controlled Fracturing will stabilize ok in most 1:10's, but the 168, 174, and 194 need a 1:8; if a customer shoots any of these in a 1:11 with a can on, they are going to have a baffle strike. The BC's (G1) for the .308 subsonics on the Lehigh Defense site are as follows: 168gr(0.630), 170gr(0.531), 174gr(0.586), 194gr(0.638)
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