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18'' barrel velocity increase

864 Views 7 Replies 5 Participants Last post by  dmsbandit
I recently had the barrel on my xs7 .308 cut to 18''. I chronographed Rem factory loads @ 2738 fps in the 22'' barrel before I had it cut off. On Friday I shot a 5 shot group of these same shells, they averaged 3111 fps. I was amazed. I was hoping to not lose more than 200 fps but I gained 373 fps. Has anyone else had this happen when shortening a barrel?
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Something went wrong somewhere...what you say happened is not possible within safe pressure limits.

Chrono error I suspect...low battery?
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