BSA/Gamo still rules as far as very good barrels on a budget rifle.. but having a blast with my icon... Found my K.O. 13.4g tune for it... power adjuster at .41" in... 3000 929 2800 949 2600 935 2300 919 2100 890sent some CPUM in between the above shots... did a 10.5 2900 psi string 1026 at 2900up to 1040 at shot 3 and stays there till 6th &7th at 1036... then 1038 at shot ten... then the falling string starts...at about 2600 psi...from 1020 down to 968 fps at 20th shot at 2100 psi...4 shot groups cause I have 16 Shots at ~26 fpe with the K.O. 13.43... Dry blurry eyes from new medication or would be a bit better...
I am the proud owner of not one but two AR2078-B's. I enjoyed mine so much, when Covid-19 was JUST rearing it's ugly head in China, I saw them starting to become scarce so I bought a second for my S.I.L. but it's still here. (He is a PB boy) so I claimed it. My original is starting to show it's age but the second is like new... but is very seldom shot. While details vary, there is something special about the "B", other than being a sidelever, in the barrel. Reports say "choked" and slugging mine it is true. Both rival the accuracy of my FWB 300S at 10M... even out to 30 yards. Seems the limiting factor is the loose nut behind the trigger (me). Now.. that said, when they arrived the barrel was FILTHY! It took 10 patches, 3 wet and 7 follow-up dry, to get out what ever brown gunk they had in the bore... ether intentional to protect it or accidental machining residue. What ever "Fairy Dust" is in those guns is nothing short of amazing for $170, 5 years ago.
'Tis true! a definite restriction about 3/4 up from the breech to muzzle on both.I think the brown stuff cleaned out is to protect the bore for storage and over seas salt water journey.I just wish SAG would quit pu$$y footing around and relaese the 1380 from Shot Show 2020!https://www.gatewaytoairguns.org/GTA/index.php?topic=183857.0
Hi.From reviews and personal experience I am extremely impressed with SAG barrels:Steve Scially shot a 1.19" group with the sub $200 qb Chief at 100yds (with only 25 ft lbs!)JC at Airgun Detectives just called the SAG-made Barra 1100z the best new entry level pcp.The qb78 is legendary for accuracy within the limits of its power.I am obviously a fan, so I may be a bit blinded.Any thoughts on who might give SAG competition in the same price range?Thank you!
Quote from: PelletSport on January 25, 2023, 02:33:05 AMHi.From reviews and personal experience I am extremely impressed with SAG barrels:Steve Scially shot a 1.19" group with the sub $200 qb Chief at 100yds (with only 25 ft lbs!)JC at Airgun Detectives just called the SAG-made Barra 1100z the best new entry level pcp.The qb78 is legendary for accuracy within the limits of its power.I am obviously a fan, so I may be a bit blinded.Any thoughts on who might give SAG competition in the same price range?Thank you! OK Right off the Top what's "SAG" barrels super secret special code for?
While tuning up a friend's .177 SAG QB78, I found that a little tweaking yielded good results. Quarter-inch groups with Crosman Destroyers at ten yards are now the norm. Half-inch groups were originally the best that it would do. It prefers wadcutter type pellets, unlike the original QB77. This rifle didn't suffer from as many sharp (undressed) edges as the Beeman .22 that I have did.I did find a patch of bad rifling about six inches from the breech, but it doesn't seem to affect the accuracy. Thoroughly cleaning and lightly lapping the bore helped, but removing the barrel-band and semi-free-floating the barrel helped more. Adding a cardboard and painter's tape cheek-piece tightened the groups some more. Their stocks do leave much be desired.I just wish they were made in America...J~
Nice groups and cudos on the build! I have never seen a free floated qb. It makes sense since high-end pcp makers all seem to float the barrel. I like the shim you put in place of the barrel band, too.
Quote from: PelletSport on January 31, 2023, 09:56:40 PMNice groups and cudos on the build! I have never seen a free floated qb. It makes sense since high-end pcp makers all seem to float the barrel. I like the shim you put in place of the barrel band, too.Thanks! I did forget one thing... The burrs that we usually find on the interior of the barrel breech at the transfer port. Once they're dressed, accuracy tends to improve dramatically.The spacer is part of one from an old SSP-250. It's now secured with a dab of silicone. I plan to drill and tap the breech for a couple more grub-screws to better secure the barrel.I have to give credit where it's due. Ribbonstone (Robert) taught me everything I needed to know when it comes to these guns.Stay safe,J~
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