Badlands Precision Bullets thread - From BC to terminal ballistics

[xsn10s]

I get 3030 fps from my 6.5x47 Lapua using our 135 gr SBD2 in a 7 twist barrel using SB6.5

Just to confirm that's a .700 G7?

 

[xsn10s]

Just to confirm that's a .700 G7?

Nevermind I read it wrong from the website. I see .700 G1 and .358 G7.

 

[nralifer]

Just to confirm that's a .700 G7?

0.7 is the G1. G7 is .358

 

[Slick8]

Nevermind I read it wrong from the website. I see .700 G1 and .358 G7.

^^^^That's still an impressive number.

I'm hoping I can get these things to shoot for me. I'm building a long throat 30-28 Nosler with an 8 twist and want to run the 205 SBII's.

 

[xsn10s]

^^^^That's still an impressive number.

I'm hoping I can get these things to shoot for me. I'm building a long throat 30-28 Nosler with an 8 twist and want to run the 205 SBII's.

Yes they are still impressive. At my elevation of 2200 ft the 135 gr SBD2 with MV of 3000 fps still has 1459 ft/lbs of energy at 700 yards. Pretty impressive.

 

[BEEMAN]

I get 3030 fps from my 6.5x47 Lapua using our 135 gr SBD2 in a 7 twist barrel using SB6.5

How long is your barrel? That's impressive velocity out of the 6.5x47. My RBros 6.5x47 gets me right at 3000 FPS out of an 26" barrel with H4350 and a 130 VLDH.

 

[nralifer]

That is interesting, I did not know these were suspect on terminal performance at hi impact velocity?

They not suspect. At 3000 fps impact velocity they sure as hell will perform better than any lead core. Don't expect the petals to stay on though. They will come off in 6-8 " of penetration. The shank will plow right through.

 

[codyadams]

They not suspect. At 3000 fps impact velocity they sure as hell will perform better than any lead core. Don't expect the petals to stay on though. They will come off in 6-8 " of penetration. The shank will plow right through.

What Northkill meant was, while the killed well, they caused significant damage in his experience. He shot, a deer I think? With the 7 Allen magnum, at a relatively close range, if I recall correctly. Please @Northkill, correct me if wrong. It's in this thread I think, just a ways back.

 

[Quintus]

They not suspect. At 3000 fps impact velocity they sure as hell will perform better than any lead core. Don't expect the petals to stay on though. They will come off in 6-8 " of penetration. The shank will plow right through.

Ok, that was my expectation from what I had read.

 

[cbuck516]

Ok, that was my expectation from what I had read.

I had two kills last year with the 95gr BD2 at around 3200fps and 3450fps. Both very lethal performance. Petals did appear to shear off and cause further damage while shank exited on both animals. Very minimal meat loss.

 

[nralifer]

I had two kills last year with the 95gr BD2 at around 3200fps and 3450fps. Both very lethal performance. Petals did appear to shear off and cause further damage while shank exited on both animals. Very minimal meat loss.

Minimal meat damage is what you want if you plan on eating the Deer or Elk.

 

[nralifer]

What Northkill meant was, while the killed well, they caused significant damage in his experience. He shot, a deer I think? With the 7 Allen magnum, at a relatively close range, if I recall correctly. Please @Northkill, correct me if wrong. It's in this thread I think, just a ways back.

He is right about weird things happening with very high speed impacts. Because of the speed there is an explosive effect simply because of the large kinetic energy transfer. A friend of mine, Adam, shot a Wisconsin Whitetail with the 150 BD2 using a 300 Rum. It was going 3500 and change fps. He hit in the chest with the opposite side lung blew out. The heart was not hit apparently and the Deer ran off with the lung dangling. Was found the next day half eaten by Coyotes about 100 yds from where it was shot. Speed is great but you can have too much of a good thing sometimes.

 

[akmtnhnt]

I did some more testing this time with StaBall Match. SBM is faster burning than LVR so I was more prone to reach maximum pressure. I'm showing the data in the picture. At 50 gr the powder is compressed by both bullets. For the BD2 primer flattening was observed at 51 gr. For Bullet #1 it was observed at 52.5 gr. In both instances the powder level reached the mid neck and higher. In other words the powder was compressed maximally. At 52.5 gr Bullet#1 is going only 23 fps faster than the BD2. The difference in speed is minimal, and because of the large BC difference, the difference is made up within the first 50 yds by the BD2. Pics 2and 3 show JBM trajectory charts for both bullets. At 1000 yds Bullet #1 is at the speed of sound having only 426 ft-lbs of energy. The BD2 at 1000 yds is going 1720 fps with 985 ft-lbs of energy. 231% more energy. I'll concede that multiple ridges might marginally improve MV but at a huge expense in In BC. Given these test results, the small differences in MV don't come close to the losses in BC that result. In fact to equal the energy of the BD2 at 1000 yds, Bullet #1would have to start out at 4065 fps (chart 3), impossible to obtain in the 308 Win for sure.

Oh absolutely. The BC of your bullets really makes them shine. I run BD2's in all my guns but my 1-11 3006 now simply because if I want a 150gr bullet, I can just grab a different rifle. In fact I'm building a rifle around the 150gr 277 bullet. Ballistically, with how fast you can run a 150gr 270, it's velocity and energy are high enough to kill anything with fur way past where I can take a shot on an animal from.

I'm just trying to remain objective purely about the speed. It appears that the Badlands bullets are equal to bullet #1 if pressure is the same, but as you said, even if slightly slower, that's made up in the first 50 yards or so, and wildly made up by 500.
The one thing you can't easily math is wind. Not only is it a guess most of the time, but even if you have an anemometer, it's very likely not that 10mph crosswind from here to the target unless you're on an open plain. The higher the BC, the more you can miss the wind call but still be within minute of deer.

 

[nralifer]

Oh absolutely. The BC of your bullets really makes them shine. I run BD2's in all my guns but my 1-11 3006 now simply because if I want a 150gr bullet, I can just grab a different rifle. In fact I'm building a rifle around the 150gr 277 bullet. Ballistically, with how fast you can run a 150gr 270, it's velocity and energy are high enough to kill anything with fur way past where I can take a shot on an animal from.

I'm just trying to remain objective purely about the speed. It appears that the Badlands bullets are equal to bullet #1 if pressure is the same, but as you said, even if slightly slower, that's made up in the first 50 yards or so, and wildly made up by 500.
The one thing you can't easily math is wind. Not only is it a guess most of the time, but even if you have an anemometer, it's very likely not that 10mph crosswind from here to the target unless you're on an open plain. The higher the BC, the more you can miss the wind call but still be within minute of deer.

I think BC is under appreciated. It is fundamental to bullet performance, especially hunting bullets. It determines how quickly a bullet sheds its energy after it leaves the muzzle, and thus determines the effective range of an expanding bullet. If a bullet expands reliably down to 1700 fps, BC determines how far it will go before it reaches that speed.