Highest BC bullet in the 105 to 108gr weight class

[SteveOak]

What twist would you need for 125 grains? 1:5?

I worked at length with the bullet maker. He has taken me on as a project. We are guesstimating an SG of 1.33 or so with an 8 twist barrel at 2,550 to 2,600 fps MV.

I'm expecting it to be 1.39 to 1.4" long and 124 to 125 grains.

 

[Ballisticboy]

I worked at length with the bullet maker. He has taken me on as a project. We are guesstimating an SG of 1.33 or so with an 8 twist barrel at 2,550 to 2,600 fps MV.

I'm expecting it to be 1.39 to 1.4" long and 124 to 125 grains.

With a bullet of that L/D you can always obtain the SG you want through twist rate and bullet CG position. The problem is not going to be SG but SD since it is very difficult to predict let alone obtain the dynamic stability you will need. In large calibres there is a limit of around 7 calibres above which you cannot get adequate dynamic stability with a low drag design. For bullets I would expect that limit to be significantly lower. I am not saying it cannot be done, but, even with an L/D approaching 6, it is difficult to get dynamic stability at 155mm calibre let alone 6mm.

 

[JRS]

I worked at length with the bullet maker. He has taken me on as a project. We are guesstimating an SG of 1.33 or so with an 8 twist barrel at 2,550 to 2,600 fps MV.

I'm expecting it to be 1.39 to 1.4" long and 124 to 125 grains.

Where did the bullet maker find the jackets to accommodate that bullet?

 

[SteveOak]

With a bullet of that L/D you can always obtain the SG you want through twist rate and bullet CG position. The problem is not going to be SG but SD since it is very difficult to predict let alone obtain the dynamic stability you will need. In large calibres there is a limit of around 7 calibres above which you cannot get adequate dynamic stability with a low drag design. For bullets I would expect that limit to be significantly lower. I am not saying it cannot be done, but, even with an L/D approaching 6, it is difficult to get dynamic stability at 155mm calibre let alone 6mm.

155mm would definitely qualify as large caliber. LOL

Do you have any input as to the original topic? "Highest BC in the 105 to 108gr weight class"

 

[Ballisticboy]

155mm would definitely qualify as large caliber. LOL

Do you have any input as to the original topic? "Highest BC in the 105 to 108gr weight class"

As 6mm is not a widely used military calibre I have tested very few 6mm bullets, though the ones we did test showed very good drag consistency (probably more important)and low drag coefficients, and even then we did not use BCs just individual drag laws produced from Doppler tracking radars. My comments on the 6mm long bullets are based on experience with other long designs at various calibres.

 

[Catfur]

Don’t waste time on the 110 smk. 115 dtac is fantastic in a 1:8 twist if you have decent velocity 3k ish FPS.

Why is the 110 smk wasting time?

 

[johara1]

RG Robinett's (BIB) 104 Gr. BT has a BC of .54

I've had thousands of them, and they shoot great, but that is very high BC. for a non VLD. Unless it is something new it was the old 108 nose and a bobtail punch..... jim

 

[RampedRaptor]

Why is the 110 smk wasting time?

From my personal testing and speaking to others in the industry, they seem to be too temperamental for many to tolerate. The numbers look great on paper but unless they deliver consistent results they are little value.

 

[dcali]

Here's the thing. "What's the highest BC in XXX class bullet?" is the wrong question. Once you've decided to shoot XXX class bullet, you've made your BC choice, more or less. Sure, some designs have better drag characteristics than others, even within a weight class, but BC is not a measure of bullet goodness. It's a measure of drag. The differences in BC between well designed bullets, which most of the majors (all?) make, is going to be small enough to disregard in favor of the results on paper. In fact, the things that give a bullet a high BC tend to make them less accurate.

 

[dcali]

Where did the bullet maker find the jackets to accommodate that bullet?

This is a very good question. Is there a jacket maker I don't know about?

 

[SteveOak]

...the results on paper......

This is not for shooting paper.

 

[STOMP442]

Personally, I think the 110 SMK is worth the look. They shoot fantastic for me in my 6mmXC and the BC is underestimated in my experience. I am having to use a .313 G7 for accurate firing solutions out to 1167 yards. I am using a 7.5 twist 26" Proof barrel and pushing them at 3070fps with 40.0gr of R16.

 

[284winner]

The BC published for the Berger 105gr Hunting VLD is .545.

Is there another another bullet under 110gr that has a better BC and equal or better accuracy?

This could be an off the shelf bullet or one that had the better BC after trimming and pointing.

Hornady's New A-Tip 110 grain 6mm bullet would be in the highest class of BC bullets if the published numbers are true. .304 BC seems impressive. Price isn't all that impressive tho. Worth a look if your looking at the highest BCs out there

 

[Ned Ludd]

Unless you're talking about an increase in BC of at least 5-7%, it's really not as important a consideration as consistency/uniformity, ease of load development, and inherent accuracy/precision. This is typically the amount of increase in BC generated by pointing bullets and you can certainly detect a measurable, albeit small, difference by doing so. However, if the increase in BC is any smaller than that, it will be generally lost in the noise even if the other factors as listed above are basically comparable between the different bullets.

 

[284winner]

Unless you're talking about an increase in BC of at least 5-7%, it's really not as important a consideration as consistency/uniformity, ease of load development, and inherent accuracy/precision. This is typically the amount of increase in BC generated by pointing bullets and you can certainly detect a measurable, albeit small, difference by doing so. However, if the increase in BC is any smaller than that, it will be generally lost in the noise even if the other factors as listed above are basically comparable between the different bullets.

Precision and accuracy trumps all else without a doubt BUT no reason a bullet couldn't provide both. No telling till some range work is done with the new ATips. Too rich for my blood. I'm good with the old Amax or ELDs.

 

[Ned Ludd]

Precision and accuracy trumps all else without a doubt BUT no reason a bullet couldn't provide both. No telling till some range work is done with the new ATips. Too rich for my blood. I'm good with the old Amax or ELDs.

Absolutely. I'm always up for trying a new bullet that has an advertised BC sufficiently higher than existing offerings that I think it might provide an advantage. However, on quite a few occasions I have found that accuracy/precision, ease of tuning, or even just the cost, made me realize that the new offering really wasn't any better than, if as good, as what I had been using. Sometimes with fairly subtle differences, you just have to buy some and load some up and see whether they actually are an improvement.

 

[284winner]

Absolutely. I'm always up for trying a new bullet that has an advertised BC sufficiently higher than existing offerings that I think it might provide an advantage. However, on quite a few occasions I have found that accuracy/precision, ease of turning, or even just the cost, made me realize that the new offering really wasn't any better than, if as good, as what I had been using. Sometimes with fairly subtle differences, you just have to buy some and load some up and see whether they actually are an improvement.

Many shooters here compete so dependable and reliable bullets are a must. For me Hornady has been a mainstay in my bullet supply. They are inexpensive, accurate and dependable (for me) as missing an X , 10 ring or even target won't matter in my world. I shoot Berger and Lapua regularly also and I get the same results only at a fairly higher cost to purchase. I tend to buy what my gun tells me it likes. Most often times Berger and Hornady are very close in my rifles. Even if a berger outshoots a Hornady bullet, it's not by enough margin for my use to make me decide to go the Berger route. Some of my .224s shoot the Berger's better to the point of sticking with them. I find, like you do that most times, new release bullets are worth trying but often times do not get the nod as they don't out perform my previous choice. Hornady does have some outstanding published BCs that do hold those numbers on the range. I will continue to pick up 100 everytime they develop a new series or product line. At their prices, it'd be crazy not to at least experiment. Unfortunately that can't be said for the A Tip design. We can only hope those prices come down a bit.

 

[r bose]

The BC published for the Berger 105gr Hunting VLD is .545.

Is there another another bullet under 110gr that has a better BC and equal or better accuracy?

This could be an off the shelf bullet or one that had the better BC after trimming and pointing.

This isn't going to be a very popular response but I've had very good luck with the Nosler 105 RDF. Posted BC is 571 and after shooting them 1000 yards they seem to hold true to advertised BC. I'm using an 8 TW kreiger and a 7 1/2 TW Kreiger 30" barrels

 

[284winner]

This isn't going to be a very popular response but I've had very good luck with the Nosler 105 RDF. Posted BC is 571 and after shooting them 1000 yards they seem to hold true to advertised BC. I'm using an 8 TW kreiger and a 7 1/2 TW Kreiger 30" barrels

RDFs do well in my 6.5s also. Heard many complaints but again I don't compete so a flier don't cause issues for me. It's just a ground hog back in hole for tomorrow.