Vulcan and JSB .25 MK 1 and MK II 34 gr pellets

[Beach-gunner]

Thinking about best tune for this pellet. Anyone already done so? What speed provides best accuracy and BC for your barrel? Bought a few tins last year..but my Vulcan is a laser with 24.5 gr and I never focused on the MK 1 or MK II. Any help much appreciated.



Beach-gunner

Dennis

 

[JCD]

Little different delivery system but same barrel... I have a Uragan in .25 and also a Vulcan Tactic in 30, and have had other Vulcans in the past. I have found that (at least in my guns/barrels) there a limit. When I pushed JSB .25 Kings over 950 groups fell apart at 75y. They were pretty happy at 940 but they were also just as happy at 900ish. That's as far as I went and even that is a byproduct of adjusting for the MKII's (the 34's). My gun did ok with the 34's from the start. The Kings were doing 940, the MKII's 850-860ish. But if I was going shoot Kings, I wanted to try less power. MKII's I want to try more power. There is always wind so I figured I go for the MKII's. I have them shooting at 890-900FPS and am very happy with the results, at least at 75y.

Granted, diff gun but if it comes down to what the CZ barrel will do then I think it applies 

 

[Zonk]

Beach, my Vulcan2 in 25 shoots both the 25 and the 34 Gr pellet with great results. The 25 Grainger at 915fps and the 34 Grainger at 850fps. BOTH pellets will shoot 1/2" groups at 50 yards.

Zonk

 

[Beach-gunner]

Thanks Guys...currently my Vulcan gen 2 (of the first productions,,purchased in June 2017 or 2016). I love this gun! It has great accuracy out to 100 yds 1 inch groups typically, with Kings at 900 FPS. They will drift with wind when target is out to 75 - 100 yds, so thinking Ill try MKII just to see what happens. I just have not made any adjustments since Talon Tunes Tony sent it to me in 2016 or 2017...no need to LOL.