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My 18″ 1:10 carbine works fine for cast, 145gr PB.  I push it (2-2.1K fps) and get good results.  Works good with vmax & ssts, 150gr SPP and 168 Amax (just OK) @ 100 but case vol. is low so the moderate heavies can’t be pushed too fast.  1:8 might help there. You will have to push the light ones pretty hard to get the gas to work so maybe the 1:12 would work better.  I run the 100gr half jacket in 1:8 pistol with pistol powder and they go fast but won’t cycle. IMHO, 14 is too slow, 12 might work, 10 works fine.

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