nralifer
Well-Known Member
Here is a pic of the prototype.
Badlands Precision Bullets thread - From BC to terminal ballistics
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Bghunter338
Well-Known Member
How much longer is it from the 140s?
nralifer
Well-Known Member
The 150 277 SBD2 is 1.560" total length with a .250" long tip.
195 grain bulldozer in action out of my 300 PRC.
Huntnful
Well-Known Member
Awesome bull dude!! Not being critical, or I guess I am lol. But why the steep angle shoulder shot instead of just hitting him square on frontal? Especially with that big mono bullet?
nimrod_gn
Well-Known Member
Do these shoot best with a slightly faster burning powder than normally used for a given bullet weight?
He was quartered enough from where I was shooting I knew it should come out the other side.
Camera man had more of a direct line on him than I did.
Idaho Trecker
Well-Known Member
It's the same length as the 140? Any estimate on bc yet?
Awesome stuff. Congrats!
Huntnful
Well-Known Member
You can clearly see the bullet trace in literal slow motion coming from the left side of the camera frame (an even more direct line shot on the bull than the camera man) and brushing along his left shoulder running lengthwise down his body coming out in front of the right leg. I video all my kill shots and can analyze them quite well lol. I can see exactly what happened and where it impacted. No need to try and justify it differently, we all make a shot placement mistake here and there, and it's not even a big deal dude. I was just curious if you would have placed it differently given the opportunity again. Second shot looks like it was money based on the pictures and I'm glad you got to test out those bigger Badlands bullets and killed a great bull!
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nralifer
Well-Known Member
we calculate the G1 at 0.680 or so. Have to apologize to you. I grabbed the wrong bullet since both look almost the same. The new 150 gr .277 SBD2 prototype is 1.635" long with the tips on both the same 0.250". Stability for the 150 is 1.43 from a 1:8 and 1.63 from a 1:5 twist barrel at sea level and 59 F assuming a 3000 fps muzzle velocity.
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nralifer
Well-Known Member
This is an awesome video. Very large Bull. The Moose was hit twice on the Lt side with the first shot looking like it hit a bit back of the left shoulder but clearly disabling the left leg. The second shot also hit on the left shoulder but at more of a broad side angle. Both 195 gr BD2 bullets exited on the right side with the first one exiting further back from the second and penetrating a considerable distance from the second because the angle of the shot was so quartering. Hard to know the exact penetration distances as they weren't measured, but given the size of the Moose both were significant. Graphic demonstration of the penetrating power of those bullets. These guys have their act down. Packing out such a large animal along with everything else they harvested is remarkable. I definitely will follow their channel.
I was hoping for a BC improvement more similar to the 195gr VS 205gr 0.308" BD2 (G1 of 0.675 vs 0.785 respectively). With the 0.277" BD2 comparison of 140gr vs 150gr being G1 0.650 vs 0.680, there isn't much of a ballistic advantage from my simulations. I simulated both bullets in GRT using the same approach and then plugged into my ballistics calculator. At 800 yards (50F @ 7,500ft), the 150gr is moving 50fps slower, has 50ft# more energy and 0.1" less wind drift than the 140gr. That is nearly identical performance in my opinion.
Is the 150gr 277 being designed to accommodate some specific problem that 6.8 Western shooters have with the current 140gr?
nralifer
Well-Known Member
Not really. People like heavier bullets and the 6.8 Western will push that bullet considerably faster and with a better BC than the Berger 170 gr out of the commercially available twist barrels. Penetration on game with either the 140 or 150 bullet should be much better than the Berger especially at high impact velocities.
What cartridge did you use in your simulation and what muzzle velocity did you predict for the 150? My guess from the 6.8 W a 3200fps should be achievable. The 140 from a 270 Win should be around 2900-3050 fps. Depends on the powder a lot. Superformance is quite good in the 270Win.
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