Ran across this article about loading secant bullets, these are the newer style bullets like Nosler RDF's and Berger VLD's. These bullets are very slim and long and require different reloading procedure. I have been jumping mine for a while now with great success.

VLD bullets are designed with a secant ogive. This ogive shape allows bullets to be more efficient in flight (retain more velocity = less drop and wind deflection). While this result is desirable for many rifle shooters the secant ogive on the VLD bullets produces another result in many rifle. It can be difficult to get the VLD to group well (poor accuracy).
For years we encouraged shooters to use a base of cartridge to end of bearing surface OAL (I will use the term COAL to represent this dimension) which allows the VLD to touch the rifling or to be jammed in the rifling. This provided excellent results for many shooters but there were others who did not achieve top performance with the VLD jammed in their rifling. These shooters were left with the belief that the VLD bullets just won’t shoot in their rifle.
Other groups of shooters were discouraged by our recommendation to touch the rifling. Some of these shooters knew that at some point during a target competition they will be asked to remove a live round. With the bullet jammed in the rifling there was a good chance the bullet will stick in the barrel which could result in an action full of powder. This is hard on a shooter during a match.
Yet another group of shooters who were discouraged by our recommendation to touch the rifling are those who feed through magazines or have long throats. Magazine length rounds loaded with VLDs could not touch the lands in most rifles (this is the specific reason that for years we said VLD bullets do not work well in a magazine). When a rifle could be single fed but was chambered with a long throat a loaded round that was as long as possible still would not touch the rifling.
Until recently, shooters who suffered from these realities were believed to be unable to achieve success with VLD bullets. Admittedly, we would receive the occasional report that a rifle shot very well when jumping the VLD bullets but we discounted these reports as anomalies. It was not until the VLD became very popular as a game hunting bullet that we were then able to learn the truth about getting the VLD bullets to shoot well in a large majority of rifles.
After we proved that the Berger VLD bullets are consistently and exceptionally capable of putting game down quickly we started promoting the VLD to hunters. We were nervous at first as we believe the VLD needed to be in the rifling to shoot well and we also knew that most hunters use a magazine and SAMMI chambers. Our ears were wide open as the feedback was received. It was surprising to hear that most shooters described precision results by saying “this is the best my rifle has ever shot.”
We scratched our heads about this for awhile until we started getting feedback from hunters who were competition shooters as well. Many were the same guys who were telling us for years that the VLDs shoot great when jumped. Since a much larger number of shooters were using the VLD bullets with a jump we started comparing all the feedback and have discovered the common characteristics in successful reports which gave us the information needed to get VLD working in your rifle. We were able to relay these characteristics to several shooters who were struggling with VLD bullets. Each shooter reported success after applying our recommendation.
Solution
The following has been verified by numerous shooters in many rifles using bullets of different calibers and weights. It is consistent for all VLD bullets. What has been discovered is that VLD bullets shoot best when loaded to a COAL that puts the bullet in a “sweet spot”. This sweet spot is a band .030 to .040 wide and is located anywhere between jamming the bullets into the lands and .150 jump off the lands.
Note: When discussing jam and jump I am referring to the distance from the area of the bearing surface that engages the rifling and the rifling itself. There are many products that allow you to measure these critical dimensions. Some are better than others. I won’t be going into the methods of measuring jam and jump. If you are not familiar with this aspect of reloading it is critically important that you understand this concept before you attempt this test.
Many reloaders feel (and I tend to agree) that meaningful COAL adjustments are .002 to .005. Every once in a while I might adjust the COAL by .010 but this seems like I am moving the bullet the length of a football field. The only way a shooter will be able to benefit from this situation is to let go of this opinion that more than .010 change is too much (me included).
Trying to find the COAL that puts you in the sweet spot by moving .002 to .010 will take so long the barrel may be worn out by the time you sort it out if you don’t give up first. Since the sweet spot is .030 to .040 wide we recommend that you conduct the following test to find your rifles VLD sweet spot.
Load 24 rounds at the following COAL if you are a target competition shooter who does not worry about jamming a bullet:
1. .010 into (touching) the lands (jam) 6 rounds
2. .040 off the lands (jump) 6 rounds
3. .080 off the lands (jump) 6 rounds
4. .120 off the lands (jump) 6 rounds
Load 24 rounds at the following COAL if you are a hunter (pulling a bullet out of the case with your rifling while in the field can be a hunt ending event which must be avoided) or a competition shooter who worries about pulling a bullet during a match:
1. .010 off the lands (jump) 6 rounds
2. .050 off the lands (jump) 6 rounds
3. .090 off the lands (jump) 6 rounds
4. .130 off the lands (jump) 6 rounds
Shoot 2 (separate) 3 shot groups in fair conditions to see how they group. The remarkable reality of this test is that one of these 4 COALs will outperform the other three by a considerable margin. Once you know which one of these 4 COAL shoots best then you can tweak the COAL +/- .002 or .005. Taking the time to set this test up will pay off when you find that your rifle is capable of shooting the VLD bullets very well (even at 100 yards).
Regards,
Eric Stecker

Have any of you good folks seen any independent testing/review of the police round? It is a 106gr barrier blind load….. https://www.hornadyle.com/6mmARC#!/ I thought maybe it would be a version of their GMX but the pictures show a lead core and jacket.

Hornady used an 18” barrel for their testing and I have both an 18” and a 12” gun. I’m wondering how it does out of a 12” barrel and how it is for precision.

Cheers,
SBRSarge

Hello: All.

Understand we are largely in a state of work with what you can get & Experience is largely limited with many bullets on game. Yet Ill reach out & ask what bullets that are available & those that may be harder to acquire, What bullets are looking more favorable for the 6mm Arc in your eyes & why.

My view favors The following at this point. Yes this is based on personal availability thus far.

For Varmints Ill settle on 85 gr pulled spire points based on price and availability in the current market.

For Hunting Whitetail or mule deer I think Ill favor the Berger 108 grain Elite hunter though I have a lot of good options including the following bullets
1.) Pulled 100 gr Hot core.
2.) Hornady 100 gr Sp
3.) 103 gr Hornady Eldx
4.) 85 gr Hornady GMX
5.) Pulled Federal 85 gr all copper Fusion.

Wish I lived in wild Hog country so I could put all of these to the test. Expect all of these would do well inside of 200 yards where nearly all of my shot opportunities come in to play.

Morning Everyone, Just curious as to what length your are trimming your brass to after the fire forming, getting you chamber and set you shoulder back(I set my shoulder back .002" (+-.0005"). Do you go by the SAAMI Brass spec of 1.490" (-.020.. up to .020" less) or do you go by the actual chamber space which allows up to 1.5" and drop it back from there?

Are there any recommendations for substitute powders for Leverevolution and CFE223?

Can't find any Berger 105 match hybrids so I picked up a few boxes of the 109 long range hybrids. How do the 109s shoot compared to the 105s? I have a 20" AR15 6arc.

Jim

Finally made it to the range this morning. My main reason was testing the SMK 107gr(1.697" CBTO/.010" off the lands) under 28.3gr of LVR with the new EC Tuner/Brake. I can tell you it does work. Expensive, but it works. Started at 0 setting on the tuner and the group was large as was 1 and 2. Started to shrink at 3(nice group and probably opened up 1 shot due to me) with 4 at .412 MOA. Shot this setting twice(forgot to reset) and same result. 5 opened to .5 MOA  and 6 went to .6 MOA. 7 opened way up again. So, I had twelve shots consecutively at .6 MOA and below. Avg velocity was 2712. I had settled on the 28.3gr from a few weeks earlier at 95+ degrees(about 85 when shooting today) out and it was at 2745 AVG. IMHO, this is near max for this bullet/powder combo as I am seeing some ejector swipes. Using CCI BR-41 primers and Hornady brass. Only problem with the EC Tuner is it is too large to get the Magnetospeed to work right as I can't get it close enough. I had to take off the tuner to test the velocity. Oh well. I think I can get it better and more testing to come.

Hello, have 200rds of 6mm ARC hornady match ammo for sale. Asking 350 plus shipping. Also have e-lander Grendel mags, 2-24rd, 2-10rd, asking $75 plus shipping for all. Text me at (504) 473-3637 if interested.

To my surprise I see an e-mail from Pac-nor that the brown truck should be delivering a drop in barrel as early as this coming Friday. Hope this turns out to be true. Seems like a long wait. Hope She turns out to be worth it.

After getting my FL die back from Hornady (the first one wasn't sizing the neck) I started testing for my Seekins/Compass Lake build.

While the velocity numbers are spectacular, the accuracy for me was pretty amazing.  I rarely see results like this out of my Tikka A1.

Last week one notable group was as follows:

5 shot group
Berger 105g Hybrid
24.2g Vihtavuori N135
O.A.L 1.684"
C.O.A.L approx 2.203"
Average Velocity 2530'/sec
SD 7.4
ES 18
Group size .3130

I re-tested this week to see if it was a fluke and the results are as follows:

5 shot group

Berger 105g Hybrid
24.2g Vihtavuori N135
O.A.L 1.684"
C.O.A.L approx 2.203"
Average Velocity 2530'/sec
SD 11.9
ES 24
Group size .4180


Berger 105g Hybrid
24.4g Vihtavuori N135
O.A.L 1.684"
C.O.A.L approx 2.203"
Average Velocity 2551'/sec
SD 12.1
ES 29
Group size .2855


[url=Berger 105g Hybrid 24.2g Vihtavuori N135 O.A.L 1.684" C.O.A.L approx 2.203" Average Velocity 2530'/sec SD 7.4 ES 18 Group size .3130]Berger 105g Hybrid 24.2g Vihtavuori N135 O.A.L 1.684" C.O.A.L approx 2.203" Average Velocity 2530'/sec SD 7.4 ES 18 Group size .3130[/url]