maybe old military firearms with really dirty barrels that just have carbon'ed up to hell.
My well used 7600 pump 308 has been around since I had to sell my M14 and L1A1 off to a well-known theft of many of our useful firearms.
It's fired 1000's or rounds, mainly in the bush and it's been out in pouring rain, gummed with dust mixed q\with oil, lent to knew shooters keen to try it, everything, for 30 years. The first original pump forend was ripped off after being chewed off by getting in a tractor loader mechanism (don't ask), it was lost from a ute and cartwheeled down the track, ripping the 6-48 screws out of the action that hold the mount on.
I got another forend online secondhand, but it now wears a Lucky13 adaptor to fit a Magpul 870 forend the same colour as the rear stock that I fitted because it has extra heights for the cheekpiece to get my eye in line exactly with the scope for lightning fast on-target aim.
It still wears that 3-9x VX2 scope, which hasn't missed a beat even though it's been hammered.
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It used to easily shoot MOA with 45gns 2208 and 150gn Taipan bullets (remember how absolutely perfect they were from 2600-3000fps on huge pigs?)
in the old days.
But lately it's been terrible, shooting 3" or worse for three shots. I tried everything, clean, clean, clean with different bore chemicals, scope mounts, barrel float clearance (these things have full-floating barrels), tightness of barrel in the action, everything.
So I tried this... the chemical paste that made the awfully finnicky Howa 243 stainless I made the mistake of buying, actually consistent.
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So, on a jag with a tight patch coated in this stuff, maybe 20 strokes back and forth.
Then another one, about 20-25 times.
Both came out black as coal as could be expected. This was from a barrel cleaned with copper solvent first, until no green came out at all.
then a super-clean with good 'ol Hoppes 9, until patches and chamber were clean.
A look with a Teslong borescope I bought showed a chrome-like mirror finish, with rifling lands still sharp and crisp after all this time and use. Unbelievable.
Well, first 3 shots was under 25mm at 110m, so another 3 over the top of those once it had cooled. Group didn't get bigger.
Then I tried some 150gn hollow-point Sierra "Varminter" flat-base projectiles, 3 shots over the top exactly.
The old girl is back!
Don't underestimate the poor results a huge amount of use allows this bastard carbon to gunk up the rifling in front of the chamber and wreck the consistency and the accuracy.
This awesome stuff is available even smaller towns like ours, at Autobarn, Repco and SuperCheap. Do not think you need to buy special "bore paste" at huge prices, or never be able to get any.
Just a heads-up here.
