PT2 Badlands Bulldozer 2, 30 cal 175 grain gel test at various velocities (read description)
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- Опубликовано: 3 окт 2022
- Ballistics gel testing the 30 caliber 175 grain Badlands Bulldozer at various velocities simulating different ranges depending on muzzle velocities. (Good overall performance I missed spoke towards the end and the first shot did mushroom)
1750-2400 fps all recovered and all had mushroomed. The one at 1750 didn't transfer near the energy into the gelatin but it did do its job even that low. (If that is a concern of yours then keep your impact velocities higher)
I do like in part 1 that the bullet had a very similar performance between the one that impacted the gel just over 2900 fps and the one that impacted just over 3200 fps, that makes for a good high end/velocity bullet. Core weights are 141.6 and 140.6 grains. In this video (part 2) Core weights for recovered cores shot out of the 308 Winchester are 173.5, 172.2, 164.1, 160.8, and 159.6 grains. Impact velocities ranged from 1750 fps to 2400 fps. After finding them all in my bags I could see that all of them did mushroom and as low as 1750 would still cause decent hemorrhaging if the shooter does their job and hits the boiler room.
(Sorry I did miss speak and say muzzle velocity when I meant to say impact velocity at the end of the video)
These were sent to me by one of my subscribers for testing.
I use the 10% gel standard for testing bullets that may be used for hunting large game in the US. 
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I just ordered the icbm from badlands for my 300 Norma mag. Not a lot of info out there so thanks for the video
You're welcome.
Nice job. You make great informative videos!
Thanks
Probably best for 30-06 minimum then
The 175 solid copper bullets are not good in 308 I've found out 165 grain and lower work best in 308 so you can get more fps
Yes I think they're overall performance was pretty good for what they are but I would definitely go with a lighter grain weight to increase velocity as regardless of grain weight that caliber line will need that 2000 plus fps to be able to actually perform well.
In a 308 Win the 150 gr monolithic bullets are about ideal. A WSM or 300 Win are more ideal in the 165 to 180 Grain Range and a 300 PRC, 30 Nosler, 300 RUM or 300 Norma are ideal with the 175 to 205 grain range of projectiles.
10 percent gel blocks?
Yes, 10% is the standard set for bullet testing in regards to medium and large game, and I stick with the standard set by the industry for consistency/accuracy in testing.
@simplemindedfella incorrect , 20 percent is . 10 percent is not appropriate for rifle speeds when trying to emulate terminal performance .
@@honcho714 20% is a nato standard nothing to do with hunting, the 10% standard goes back pre sixties and it still used today. The military does different things with bullets than the hunting industry. When I started my testing over a decade ago I was on the phone with nearly all US bullet manufacturers all suggesting stick with the 10% standard. The differences in 10% to 20% and how it bullet reacts is very minimal but 10% is still the standard in regards to medium large game hunting.
@simplemindedfella you are wrong, I work in a lab , I know what I'm talking about in this instance directly, 10 percent is for low velocity , 20 percent is for high velocity, ie rifle bullets . Listen and learn or don't I really don't care but if your gonna do testing you might as well do it correctly . I will not respond further .
@Mat Can you then explain to me how the density of live flesh/tissue of an animal changes via a bullets velocity on impact?
Not sure what the twist rate is in the test rifles you're using. If it's a 10 twist, anything under about 2600 fps, that bullet is under stabilized, and will not perform as advertised. That bullet is VERY long for its weight, and needs the rpm and stability for function. At 1750 fps from a 10 twist, your stability IN AIR is only about 1.1.
The gel, being much denser will cause the stability to plummet far below 1.0, and the bullet will tumble. If fired at 2600 fps out past 1000 yds, from a 10 twist, the bullet would still be spinning over 180,000 rpm. The bullet would arrive with a stability well above 1.5-1.6. At 1750 fps from a 10 twist, you're at 126,000 rpm, and barely 1.1 stability. The bullet will not maintain a point forward attitude, nor have the rpm to eject the tip. And if the tip doesn't eject, the bullet won't open. To demonstrate this, you can pull the tip out of one, and fire it at 1750fps. It will open at least 1.5 calibers in diameter. This bullet has been tested in 10% gel from a 7 twist 300 blackout, and continued to expand to 1650fps. This impact still maintained 170,000 rpm. Below 1650 fps they became erratic. Even from the 7 twist.
1:8 is the tightest twist 308 barrel I use and I plan on getting a 1:7 at some point.
I will admit I still have a lot to learn and plan on doing more rpm differences videos showing what you are talking about in the future when I have obtained some tighter twist 308 barrels. So far I have only tested rpm theories in 224 and not at super low/subsonic velocities as of yet.
A lot of subsonic ammo available shouldn't stabilize even in a 1:7 barrel based on what you are saying as the rpms would be 113,142 at max.
I know there are some big differences between monolithic and lead core. Take this bullet that Badlands says is 1.535 inches (all the ones I have measure are between 1.523 and 1.5245) and the 250 grain Hornady A-Tips I have, measuring at 1.868 inches (all A-Tips are the same length at least in the box I just checked). The A-Tips tested well and didn't tumble in the same fashion indicating a bullet that should not have stabilized as well as the Badlands bullet stabilized better. I am somewhat curious as to why?
What's the weight of the A-tip bullet? There is a lot more to stability than just length. Weight to length ratio plays in heavily. Meplaat diameter, boat tail length, base diameter, ogive length, and radius, and overall length all play a factor. Even the tip length, and material come into play. If the A-tip you referred to is 250gr, it's likely stable due to being heavy, and having a lighter, long tip. Just as an example, 2 bullets of the same length, one having a short ogive, and flat base, weighing 150gr, and the other being a longer ogive boat tail bullet, also 150gr will likely have different stability. The short ogive will cause stability to be lower than the longer ogive, but the boat tail on the other bullet will also cause it to have lower stability. Now, if the boat tail bullet weighed 200gr, then it would be much more stable. This is why copper bullets many times tumble in low velocity tests. Their length to weight ratio doesn't favor stability. Often they're on the edge of stability in a full house load. I'm not trying to criticize what you're doing. I think the channel is great. I'm just hoping to help people understand some things that we sometimes see. If you're interested in learning more about the full calculations of stability, I'd be glad to talk. Keep it up. Love the channel.
@@suspecttrigger I did list the weight. You musthave just missed it.
What you are saying also contradicts what bullet stability information is readily available out there and manufacturers recommendations of twist rates on their bullets. No the weight itself is not what affects the stability stability. In general a heavier bullet is longer and requires tighter twist for more stability. There are a multitude of factors and with those multitude of factors there's still a lot of consistencies which is why some of what you're saying is confusing because it's contradicting those consistencies and the available information.
Again I have no problem admitting I'm somewhat new to this and have a lot to learn but when I can go look at the information that's available to me and what you're saying contradicts that information I really don't know what you are trying tobget at.
The badlands bulldozer bullets would make an excellent hunting bullet and I would recommend people keep the impact velocities at or above 2000 fps so that you don't have to even worry about any of those concerns.
What I'm trying to get at is that the length isn't the only factor in stability. As you said, a heavier bullet is USUALLY longer. But that's not always the case. And with solid copper bullets it's especially nor the case. A long bullet that weighs 250gr is more stable than a bullet the same length bullet that weighs 150gr. What I'm saying is that weight, and length both play into stability. Along with many other factors. Run a stability calculator for a 1.800" .308 bullet at 250gr, and then run it again at 150gr, everything else equal. It's stable at 250gr. Not at 150. This is the problem posed by low velocity all copper bullet tests. This bullet is longer than some 200-210gr bullets, but only 175gr, which lowers its stability.
@@suspecttrigger I have put in the numbers on a stability calculator for both the 30 caliber 175 grain Badlands bulldozer and the 250 grain Hornaday A-Tip at 1650 fps in a 1:10 twist barrel. SG for the 175 grain bulldozer is 1.11 (not unstable) and 0.888 (unstable) for the A-Tip. You can see this in the gel that the bullets both were stable in flight as they both had several inches of straitline penetration before tumbling. After further inspection of the bullets recovered I do not believe it had to do with losing stability itself and more to do with the aluminum tip and how it starts the mushrooming. I plan on showing theses results in a future video.