.25cal Penetration: JSB 25.4 vs 33.95

[MP44]

Range <35yds. Velocity 25.4gr @ 935fps & 33.95 @ 825fps. Would there be much difference in penetration on larger airgun game ( headshot on very small deer ) at closer ranges?

My gun shoots the 33.95 reasonably well, especially out to 35yds but stacks the 25.4gr.

 

[T3PRanch]

Seems like I have seen a video of this on YouTube. Might have been AEAC's video on calibrated ballistic gel or one of his other videos. If I find it I'll post a link.

Thurmond

 

[Grin_Reaver]

Heavier pellet may give deeper penetration but harder pellet is more likely to penetrate deeper. Crossman premier domes and HP are harder than JSBs. Keep in mind a harder or heavier pellet that penetrates more but leaves a very narrow wound channel and does not hit vital areas could be less effective than a softer lighter pellet that expands and creates larger wound channel and dissipates all energy within the animal. The key point is you will be effective with both if the placement is right. 

 

[kuyatwo]

The jsb 33.95 has a better ballistic ce so my guess it will hit harder and penetrate deeper

 

[Alan]

I do not consider myself a ballistics expert by any means, but Grin Reaver's explanation is very close to reality. But...

Internal and external ballistics are well know sciences. Terminal ballistics (what happens when the pellet hits something like flesh and/or bone), isn't as well know or understood. And what we really don't know, is the Rockwell hardness of most pellets. Even if we did, I suspect it changes depending on the batch number. After all, the vast majority of the lead used to make pellets, is from recycled sources.

 

[Blaiz1]

I’m using diablo 25 grain an they do stack better than my Jsp 25 and 33 grain

 

[NL-Law]

I was wondering the same thing. My impact shoots both well, especially the MKII 33.95. 

After some real world bunny tests, the 33.95 grain JSB’s have the edge in overall trauma. That being said, both are more than enough for Small Game. (Not sure about Deer as there are no Deer where I live.)