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Gunsmithing Fire cracking

Ranger188

Sergeant of the Hide
Full Member
Minuteman
Dec 13, 2018
448
232
A buddy of mine is shooting a 22 creed with 300 rounds down the barrel.
It's a Shilen from NSS, using RL23 powder and 90g Bergers, 7tw, running about 3300fps ( a little hot)
Question, he cleaned barrel and bore scoped it to find the first 2 inches were fine, but said
the next 2 inches were a little fire cracked. Why would the first couple of inches be fine
and the next be fire cracked? Normally you see the first inch or so toasted.