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 Post subject: Pellet Penetration
PostPosted: Thu Feb 28, 2019 3:26 pm 
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Joined: Sat Nov 03, 2007 4:19 pm
Posts: 8972
Location: Coalmont BC
I have been collecting penetration data in "melt-and-pour" soap for a few years now, for a lot of pellets and a few bullets.... The bullets have a lot of variation in nose shape, and the data is therefore scattered.... but if I take out all the Hollowpoint pellets and look only at those which don't expand, I get a very close correlation with theory.... The data lays quite nicely along a linear trendline....


The basis for the theoretical penetration is the Sectional Density of the pellet multiplied by the Velocity, times a constant.... For the soap I use, a constant of 2 gives a penetration in mm with good correlation to what I have measured.... I didn't remove any pellets from the data except Hollowpoints, so there are datapoints in the above graph for wadcutters and pointed pellets in addition to domed, round nose, and others.... Hollowpoint pellets, which are designed to expand, and do so to a varying degree depending on the velocity.... may penetrate only about half the distance of their solid cousins or less, which is why I did not include them....

The theory only applies to non-expanding projectiles which do not tumble inside the impact media.... The fact that the data gathers around a linear trendline is quite good, considering all the variation in nose shape.... I feel it confirms the basic theory that penetration is proportional to the product of velocity and SD....


Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!

 Post subject: Re: Pellet Penetration
PostPosted: Thu Mar 07, 2019 9:15 am 

Joined: Sat Mar 02, 2019 10:14 pm
Posts: 30
Location: Laval, Qc
Wow, sweet work accumulating all this data!
I'd be curious to know what other type of statistical data you've accumulated.

#ILoveStats #PracticalApplication :D

Legends Ace-In-The-Hole (pellet)
GF529 airsoft w/red-dot

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