"Ted"[This info has been taken almost verbatim from my video review of this gun. The reason it has taken me considerable time to make it is because of the idiosyncrasies of .25 JSB Heavy pellet. Every pellet has a distinct relationship with a barrel. To shoot the Heavy .25 pellet well from Smooth Twist barrels (and perhaps all barrels), you need to understand that relationship]
The JSB Heavy .25 is a remarkable pellet. It has shown me accuracy and consistency better than any other pellet in ST barrels. BUT - it is also a more "sensitive" pellet than any other JSB. First, it likes to leave the muzzle at a slower speed than the 25gr JSB Kings. I found 870fps to be the fastest speed possible, while maintaining maximum accuracy. It is also the first (and only) JSB pellet that likes the smooth twist barrels CLEAN. Giving the gun a few patches and cleaner after each tin (300) of pellets will keep the gun shooting its best.
If you prefer to buy a gun and "just shoot it", not wanting to do any homework, maintenance, research, I recommend you just stick to the JSB King 25gr. They are not picky in the least, and shoot as well as we've come to expect. Just set the gun to 900fps, and enjoy.
And, the MK2 Heavies may very well prove to be less sensitive than the MK1's. Their skirts are said to be a smaller diameter. I have read positive reviews. I have ordered some and will post my findings.
Here are 16 shots @ 100 yards, using My FX Impact .25 and JSB King Heavy MK1 34gr @ 860fps. My zero was at 50 yards. The holdover (12.5") is on par with the JSB King 25gr, despite shooting 50-60 fps slower. The ballistic coefficient of this pellet is very good. *And note shots 3 and 4 both were low. A tail wind came over the bunker and caused a very slight down draft. I did not think such a subtle wind could have an effect. Goes to show you how little wind it takes to throw pellets around at 100 yards.
When the wind stopped, the group returned to the original POI.
did you publish this video on you tube under a differant channel name?
