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Proof carbon vs steel?

Barnes168

Private
Minuteman
Feb 12, 2023
9
6
Minnesota
Anyone have experience with both steel and carbon 6.5CM barrels from Proof?
Their carbon stops at 24” but steel goes out to 26- I’m interested in finding out velocity differences.
Load I anticipated throwing through it is:
Lapua SRP brass, 140ELDM on top of 6.5 StaBall. (Given for context)
This isn’t intended to be a reloading question, way too many variables to be able to predict what someone else got translating to what I’ll load.
Looking for any resources that have catalogued or compared the two types firing similar (preferably identical) loads to see how each performed.
 
Why didn’t you post this in the Bolt Action Rigle forum? You’d probably get some answers over there.