SWEETS 7.62--Not advised by gunsmith

Sinclair International says Sweets is just fine, if you don't allow it to dwell too long.

It is especially good for breaking in non-match barrels (which are a little rough inside) and thus snags lots of copper, lead, and powder.

Rick
 
A stainless barrel holds up better than a normal barrel.

Sweets is very strong and is only used when you have to. Like others said, it should be cleaned out afterward.

Hoppes #9 has no ammonia & is safe.

Butch's is sorta like Hoppes with some Sweets added. That is what benchrest guys use, (& myself).

One piece coated rod used from the chamber end makes a huge difference.

Many mentioned a factory barrel being so rough that it "grabs" a lot of copper. You can quickly polish the barrel yourself to fix this. I'm not sure of the exact instructions, but what you do is fire 10 rds & see what it takes to clean it. Follow this with 10 rds where the bullet is LIGHTLY coated with J-B BoreShine paste. Now clean again & see if there is a lot less copper. Maybe repeat once. I'm not an expert on how to do this, but many swear by it.
It's called "Fire Lapping". J-B is a very mild abrasive.

Supposedly improves the groups of all factory barrels.
 
While I have used Sweets in the past, I now prefer Barnes CR-10. I had a Rem 700 with lots of copper fouling. I used Sweets in it, but you could still see copper streaks near the muzzle. So then I gave it a go with CR-10 as directed and the copper streaks were gone.
 
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