Anybody using 6.5mm 155gr Cauter bullets
- Thread starter Hengehold
- Start date
Wow!
May I ask where those numbers are published. Was it in one of Litz's books or ballistics app?
-T
17VLD
Gold $$ Contributor
Matt thanks for posting the link.I have heard the newer Nosler 6.5 142 grain long range accubond has a b.c. In the low .700s which I thought might be a bit optimistic.Well the applied ballistics link confirmed that.
I'm not wanting to hijack this thread,just wondering what the best b.c. Bullet is for 6.5mm long range game.My 6.5WSM shoots the 142 Sierra very well,just thinking out loud here.
Matt
Can't beat the bergers for long rnge game. I haven't used the matrix bullets.
jmatters
Silver $$ Contributor
Mine had issues with keyholing at 600 yards. But my barrel is an 8.5 twist, and the winds were VERY bad that day (20+ mph, gusty and changing direction...). I think you will be fine, but you probably have to push a bit harder than I was; I was trying a load that gave best SD, but it turned out to be too slow. (H4350; don't have the charge amount with me). Also I jammed by .005, and I think a .010 Jump might be better... (When I tested, I was running them about a full grain hotter, and it was not as windy.)
IMHO, the 140 JLK is THE benchmark bullet for a large 6.5mm. You'll have to push a 155 real hard to beat a 140 JLK, and it'll be a loooooong ways down range before you realize any tangible ballistic benefit from the heavier bullet. So loooooong, that the practicality of opting for the 155 is negated.
The 140JLK is a wicked bullet. Goof around with a ballistic calculator, crunch some #s and you'll see what I mean...
I do not have much experience with VLDs. Do you find that they generally shoot best from a jump or a jam?
-T
Have run the numbers.
G7 for jlk is .326
G7 for 155 is .336.
Getting a modest 2805 with 155's.
Not saying anything negative of the jlk.
The 140 needs to be going 2950 to match the 155's at 2805. Drop doesn't mean much to me. Wind drift is my key component.
I just ran the same #s on Ballistic AE @1K, 10mph full value wind, at my ASL:
(G7 of a 140 JLK is .327)
155 Caut @ 2805 fps needs 8.0mils correction for drop, and 1.3mils for wind
The 140 JLK only needs pushed to 2935 fps (not 2950) to match that 1.3mil wind dope, while shaving elevation dope down to 7.3 mils!
That 0.7mil improvement translates to ~26" @1K. Don't know of many shooters who'd dismiss the benefit of over 2 FEET less bullet drop so casually?
Essesntially, you're enjoying a MASSIVE improvement in drop for the same wind bucking performance. And added bonus being, running the lighter 140 JLK will generate less felt recoil.
Dunno what case your using, but if it can push a 155 to 2805, it shouldn't have any problem making 2935 with a 140.
For comparison...
P.S, I shoot JLKs mildly jammed
I am using a 6.5-284 and suspect that I could push both bullets at 2950. For reference, In the strait 284 case the 180gr bullet can be pushed at 2800fps so I would think that I could push a 155gr 6.5mm another 100-150 fps. Just speculation at this point.
-Trevor
Distance is relative. It doesn't matter if it 2 feet less drop or 10 feet(figuratively speaking) less drop. If it is 1000 yards, Its 1000 yards. Having 2 feet less drop doesn't really matter. Your just turning the knob a little less.
Now if I was doing a competition where you had to range objects and do the math from the reticle, absolutely Drop comes into play. Flatter trajectory gives you a better margin of error if you happen to calculate the distance wrong.
Wind is your biggest variable.
I also shoot 140's but the 155's are an experiment.
I posted #s to prove my point that the 140JLK is the bullet to beat in a big 6.5.
Because the tangible ballistic and recoil saving advantage is lost for your application does not erase that fact.
IF the wind call is a wash, why wouldn't a shooter pick the flatter shooting, lighter recoiling option? Square range, known distance, or otherwise?
Just not seeing the logic behind suffering more recoil and tangibly more bullet drop, just to enjoy the same wind bucking ability?
I shoot 130s and 140s in my 6.5SAUM the 130s beat the 140s in drop, but not wind. 155s aren't even in the same ballpark, ballistically. Not for my application, anyway...
jmatters
Silver $$ Contributor
6.5mm 155gr Cauterucio :
Tried them last year in an 8.5 twist, Guillard (Canadian barrel maker) 29" tube, but got several profile impacts at 600, so I was right on the stability edge. I don't recall the velocity. Some went on target normally; some went in sideways. I suggest you push them pretty hard to be safe.
Tried them last year in an 8.5 twist, Guillard (Canadian barrel maker) 29" tube, but got several profile impacts at 600, so I was right on the stability edge. I don't recall the velocity. Some went on target normally; some went in sideways. I suggest you push them pretty hard to be safe.
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