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If you give me the bullet length and cartridge OAL for that 170 I can try to run some stuff through Quickload for you. I've worked up to 17.3 with the 175 grain Berger VLDs (OAL 2.245) and 18.1 with the 168 grain Prvi BTHPs (OAL 2.260) with no pressure signs. Worked up to 13.8 with the 190 Prvi BTHPS (OAL 2.050) and 12.8 with the 220 Hornady RNs (2.000 OAL), also with no pressure signs.
ETA: My port is in the carbine position with a 16" barrel, so YMMV.
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