30cal penetration explained

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Re: 30cal penetration explained

Post by Oldbloke » 01 Jun 2017, 12:00 am

"Classic example would be a tiny .204 round scooting along at near enough to 4000fps vs a 45/70 chugging along at 1800fps. Both are going to really ruin a fox's day. It's really an unwinnable arguement. "

But only one will kill a buff.
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Re: 30cal penetration explained

Post by happyhunter » 01 Jun 2017, 6:03 pm

If it's the same bullet type, say Sierra Pro Hunter 150 grain and the same in 180 grain, the 180 has a thicker copper jacket and needs a higher velocity to achieve the same expansion as the 150. The 180 deforms less, has more mass, retains more mass and carries more momentum so penetrates further.

Also, less than 150 meters the 180g bullet is travelling slower, so see my above point.
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Re: 30cal penetration explained

Post by Oldbloke » 01 Jun 2017, 8:00 pm

Sooo.... To sum up. Bigger is better if you want more penetration.

:lol:
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Re: 30cal penetration explained

Post by Supaduke » 01 Jun 2017, 11:07 pm

That's what the wife said.....
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Re: 30cal penetration explained

Post by brett1868 » 01 Jun 2017, 11:39 pm

Supaduke wrote:That's what the wife said.....


Nahhh...Short and thick does the trick but long and thin gets more in :)
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Re: 30cal penetration explained

Post by bigfellascott » 02 Jun 2017, 7:40 am

I found this an interesting result

The hole was made by a 22-250 using 55gn projectile, the other marks on the plate are from 222, 223, 308 and 338 Lap I would have thought the Lap and 308 would have done more damage if not penetrated but being Hardox 500 I wouldn't have thought any of them would have penetrated to be honest so was very surprised the 22-250 achieved it whilst the bigger stuff didn't.

Image


This lot are made by 308, 223 and 22-250 - what I noticed was the 308 and 22-250 had pretty much the same penetration depth but the 308 of course had a slightly larger diameter hole for obvious reasons but penetration was pretty much the same on the plate (I think we were 200m or 300m away) can't remember now but I was surprised to see how similar the penetration depth was but I would imagine that may well change the greater the distance became (well I assume that would be the case)

Image
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Re: 30cal penetration explained

Post by duncan61 » 05 Jun 2017, 12:10 am

We shot at a 10mm mild steel plate at 110 metres the .22LR knocked the paint off the .222 nearly made it through the .243 blew a 10mm hole and the 7mm blew an 18mm hole.Nothing went through the 10mm biz alloy even a 7mm 175 gr Winchester fail safe at 30 metres made a small bulge on the other side.I want my APC made out of bizalloy not aluminium
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Re: 30cal penetration explained

Post by bigfellascott » 05 Jun 2017, 4:16 am

I put that hole down to velocity + diameter - we were both very surprised when I could see the grass through a hole LOL sure as hell wasn't expecting that and neither was my mate. I would have thought the 338 Lap would have made some sort of mark on the plate but all it left were splash marks, same with the other cals - hardly a scratch on the plate then I sent one from the 22.250 and NEK Minute :shock: I figured I'd better stop shooting it or run the risk of turning it into Swiss Cheese :lol:
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