JSB's King Heavy Cal .25 33.95 grain vs. 25.4 grain

33.95’s have done well for me!! Ive honestly never tried the kings. In az we can only use .35 and up for javelina so cant help you there. 

Either one will punch through a coyote skull with ease at any reasonable velocity. The best choice will be the pellet your barrel groups the best at whatever ranges and wind conditions you intend to shoot them. Coyotes being so wary and skittish, I expect some shots will be 50 yards or greater, in which case I’m inclined to think you’ll want the much superior BC of the 34gr, but only if it is equally accurate or better in calm conditions.

Just food for thought but I have had the 25.4 gr ricochet of the skull of a large male fox. Since switching to the 34gr pellets this has not been an issue. This was/is at the same power level with similar shot placement. I still use the 25.4 in some of my guns, but I'm much more selective with my shots.

The heavier 33's have done much better than the 25's for me for head shots on groundhogs. Bill

I know on my Cricket .25 Cal leaving the tune the same and just changing the pellet itself the FPE does not change. FPE doesn't matter at muzzle, it only matters at target. The 33.95 at 900 are 61FPE and the 25.4 are 62 FPE at 1050 at the muzzle. The higher speed and with the 25.4s is more accuracy than the 33.95 out to 100 yards so I use those for the most part, because I usually shoot smaller game. The accuracy is only slight worse (in my gun) with the 33.95 so I have them with me for bigger game and here is why...

What matters in hunting is retained velocity at distance for that coyote head and that corresponding FPE. Lets say you shoot at a coyote head at 100 yards. In the 25.4 you keep about 742 FPS and a FPE of 31 at 100. Still good enough, but getting closer to a not so humane kill. Now with that same tune using 33.95 I am at 735 FPS at 100 yards but have a FPE of 40 which is much more of a humane shot. So for me slightly worse accuracy is worth the better FPE at 100 yards for that coyote. So I always have a magazine ready with the heavier pellets and know what my scope changes will need to be.

i dropped a coyote with the 33.95's, at 25 yards, head down and straight on, she just flopped over sideways and dropped without a twitch.

I didn't dig it out, but it looked like it went in the front, just above the eyes, and went in far enough to hit the spinal cord at the base of the back, but it didn't exit.

Can't speak for the 33.95gr but the 25gr have put down a large fox at 60yds for me.

Emu

Based on my shooting during the last week comparing the king, and the 34 grain heavy At super long distance, my conclusion is the 34 grain is much more consistent in every day conditions.

additionally, as everyone else pointed out, going from 25 to 34 grains is a HUGE Jump in mass. I would guess approximately 40%.

as you are aware, there are so many advantages to that additional mass. I have always been a huge fan of the king, and for target shooting inside 75 yards, it is the king.

These two groups, we’re shot on the same day similar conditions, 190 yards. 

While no one is going to try to shoot a coyote at that distance, it does give us a very good indication Of how each projectile reacts in the real world.

Everything that I learned reinforces your decision above.

The 33.95 definitely has more resistance to wind that is for sure, even at shorter distances like 50 yards. The 25s even though they are fast, get almost double to wind influence. 

Personally I would try to get the 33’s up to speed and grouping tight. I started hunting coyotes in the late 80’s when I lived in Oklahoma. I have pursued them in 4 different states over the years and with a lot of coyote hunters. I never hunted with a guy who used a .22lr or even a .22 magnum. Both of those firearms dust our lowly airguns power wise. Can and do under 100 fpe airguns take coyotes clean? Yes, but you are tip toeing on the edge of even the slightest error resulting in a wounded animal. When you get to that size animal you want to smash them with something heavy and remember what we consider heavy with airguns is a joke with a real gun.