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Crown

I use a sharp high rake hss bit and add a small 45 degree chamfer on all crowns. As long as it’s clean and concentric is the most critical IMO.
 
Sharp on a target rifle. Youll have a drawer full of tools before you find the right one. When you do itll resemble this one
View attachment 1122728

Yup, that's the tool.

36-RIn8lCegvrtnJcr2-dSX82i_0nprjYSe-Vl8Cox9-ZDdhGKMOHIfQNsNScU0IEoC1LA5Axy42rdXrzZmX4XuhTWpWXf4s_wQfD_O2Kf26D_e1OOY2Zd-M-PitivD8UbgPWQ3jQerGqdvlGYWjC_bwbNyAF88mabM_wQdo0nnPAU5EbO_j-KCjVUs8VhT1DhAYMpoSfj6CqwRtyIuChFgSZm4GaBq6ayaPH9rLS8qUtgNnFA5a4y_EZKkiz3swy-8YSrl3dY0WDpz0tD1DkRl0qcJ86DeKhGitwye2_yRgnSsphioQNCEwAoVkN5u5_y7jFrTxA8oVGrD8HcZDQ4h5f2GkD9nbTeKHeoviCPVemIDv1s6QcIWc5Ngu-UR1qm_7qrWK8jeKhJgXMggFZEVSRoInws3pLltvNMPJynTfZ6yAU90b6DMEdKZ5Q6c2Yai12Y0C3ifUVv7tMY0K0_HN_9DV_-WsaGBmNsFlnyiAEdlID-Plb09o8xTzpmCAvyfYd0rWvPYY6geQ0k2IuAPOxBu1V5cDvUUMnH-OWB_2Fjtt68Vn9RQWysWjBpet8r8ag3Pg5Q4m2a3yCxzdjouq0qy8esBTULg8vZ7VXxKg3k0KzwG3zclFNE0OPdo1II76GPlqFGKAChcPwftmbZgJmxQ2sqkAl8I6QNRK1_Q6yVIjvES7I8hSO_XR5YYhMxfSwb-6ccvjnDrrBZzTBQ8daA=w1024
 
Positive rake inserts for AL leave a baby smooth crown for me. I’ve done flat & 11 degree, can’t tell any difference. I’ve broke the edge and left it sharp. I’m probably not a good enough shooter to know the difference. Just test it yourself and prove to yourself what is best.
 
what is the benefit of a razor sharp crown? The benefit of breaking the edge is to prevent cleaning rod damage. I'm not aware of any accuracy advantage of a razor sharp crown.
1 less operation to induce error's. I use my crossfeed as the finish comes out nicer. At a 45^ Its on my hand movement to keep feed rate consistant. I cant match the gears!
 

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