Good thread - since I recently picked up a nice scoped MS 1903 carbine and was amazed at the slug size. .267"

I tried the Hornady Carcano 160 gr RN - and blew a primer (even with low starting loads - methinks I was touching the lands). It scared me and I left them alone

I tried 140 gr Hornadys and Nosler partitions, and 120 gr Hornadys. I tried to stay with flat base bullets so I could set them out as far as possible.

The 160 gr .264 Hornady gave 2" groups with decent velocities. I would like to try some Norma varieties but there are none around these parts.

But the bullet that shined was the 130 gr Barnes TSX. They grouped under an inch at 100 yds at good velocities. They fed well also - no hiccups.

I figure the length and non-boattail design with the long length at the full .264" compared only to the width below only the cannelure being .264" in the Hornady 160RN is what is important in the overbore bbl.