You have the bullets, so you can try them and see. Make up 4-5 dummy rounds(no powder or primer) and try cycling them through your Luger. Measure the OAL before and after, and see if there is significant set back.
Hornady produces(occasionally) their XTP .309 bullet. Natchez Shooting did have some for sale. I purchased 100 of them, and have them loaded up, but have not been to the range yet.
To try and help correct the potential setback on the Hornady and Sierra 85gr JSP bullets, I have added a cannalure to them and used a Lee FCD (collet type) to secure them. Do NOT try to use a hard crimp on the .308 bullets, as you will defeat your purpose. A hard crimp will put a depression on the bullet where it is applied, and the brass case mouth will spring back giving you less help on setback. It is all done with neck tension and getting everything set up correctly.
The 30 Luger round can be a bit frustrating, as can the 357Sig round. They are not like the good old 45ACP, 9mm, 38 Special, etc. Just go slow and check you work closely.....above all be SAFE!!
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