Another custom 6xc!

[Tack-243]

Ok thanks! I'll start them on the lands and figure it out from there. Sounds like people feel they are a little more forgiving that VLDs to seat and almost on par with sierras.

I think your right, let me know how they shoot if you get the chance.

Cheers

 

[Longshot]

Roger that. Should be pretty interesting to see what velocities I can run them to. I'm getting the 115 VLD up to about 3050 ish so I'm hoping the 108 can get to about 3100 accurately. Still haven't decided on which is better the VLD or the DTacs. If the 108 shoots that much better I may just dump both!

 

[AlexF]

Berger has introduced 6mm 105gr hybrid bullets which will outperform every 6mm bullet except for 6mm 115gr VLD which might still have an edge if you manage to get them to shoot accurately.
Still, a new NRA High Power 600 yards record was set with the Berger 108gr BT a week or so ago.

Alex

 

[Longshot]

I thought the BT was the hybrid?

 

[AlexF]

I thought the BT was the hybrid?

No, the Berger 6mm 108gr Boat Tail is a tangent ogive bullet, a direct competitor to Sierra's excellent 6mm 107gr MatchKing.
It has a lower BC (0.511 vs 0.547) but is much less sensitive to seating depth (easy to find accurate load).

Alex

 

[Longshot]

Ah ok. What is the actual name on the box of the new 105 hybrid? Also have you compared its length with either the 115 vld or the Dtac?

 

[kombayotch]

I've been testing the new Matrix 117 VLD (thick jacket) and it has a considerably higher BC than the pointed 115 DTAC. I'd estimate around 40-50 points higher.

 

[Longshot]

Cool are they reasonably priced?

 

[kombayotch]

No worse than what I was paying for DTACs up here...

 

[Longshot]

So I saw some 300 gr 338 "hybrids" so I'm guessing the 105 will say hybrid on the box too.
I've got the 108 bts loaded up and ready to go to the range. Just gotta get some time when the weather eases off. The 107 mk has a higher bc than the 108 bt? Wouldn't have called that.

 

[Kodiak99317]

Bullet weight/shape SD(lb/in sq) i7 G7 G1


Sierra 70g MK 0.169 1.286 0.132 0.258
Lapua 90 Scenar 0.218 0.999 0.218 0.426
Lapua 105 Scenar 0.254 1.025 0.248 0.484
Berger 95 VLD 0.230 0.923 0.249 0.486
Hornady 105 AMAX 0.254 1.010 0.252 0.492
Berger 105 BT 0.254 1.006 0.252 0.493
Sierra 107g MK 0.259 0.993 0.262 0.510
Berger 108 BT 0.261 0.999 0.262 0.511
JLK 105 VLD 0.254 0.950 0.267 0.523
Berger 105 VLD 0.254 0.933 0.272 0.532
DTAC 115 BTHP 0.278 1.007 0.276 0.540
Berger 115 VLD 0.278 0.998 0.279 0.545
DTAC 117 BT 0.283 1.000 0.283 0.553

sorted by BC

According to Litz's book, and i7 is the G7 form factor

 

[Longshot]

Ah thanks Kodiak! I don't think the 117 Dtacs ever got going did they?

 

[lyle1]

Hello Kodiak, doe Litz or anyone else have the BC listing for the 117g Matrix bullet?

 

[kombayotch]

Bullet weight/shape SD(lb/in sq) i7 G7 G1

DTAC 115 BTHP 0.278 1.007 0.276 0.540

According to Litz's book, and i7 is the G7 form factor

This is the old 115 DTAC, from before Tubb started pointing them. They are now only offered pointed and the G1 BC is about 0.588

The BC of the old 117 Matrix was lower. I'm estimating the BC of the new thick jacketed one to be about 0.630 based on some 800 yard testing I did. It is nearly 1/8" longer and the meplat is about 1/3 the size of the old one.

Marshal made these for me because I was exploding half the old ones in my Crusader. I've launched the new ones at over 3200 fps and all of them reached paper.

 

[Longshot]

So I wonder if pointing them yourself has that much effect on BC?

 

[kombayotch]

I depends on the size of the meplat. If its big, then pointing has a large effect, but if its already small, then pointing just removes the burr and uniforms them a little without increasing the BC very much.

 

[Longshot]

On Bergers it seems to close up the meplat altogether. Not bad on the Dtacs either.

 

[Longshot]

I shot a bunch of the 108 bts at 200m and they perform very well. At least as good as the Dtac. Way easier to seat than the 115 vld. I got several 5 rd groups in the 1/2- 3/4 inch range which translates in to .25-.33 moa at 200m. Pretty happy with that for sure. Didn't get a measure on speed at all.
Now I've got 500 of the 105 hybrids from Jerry to try. With a BC slightly higher than the 115 vlds these should be very interesting bullets!

 

[Tack-243]

I shot a bunch of the 108 bts at 200m and they perform very well. At least as good as the Dtac. Way easier to seat than the 115 vld. I got several 5 rd groups in the 1/2- 3/4 inch range which translates in to .25-.33 moa at 200m. Pretty happy with that for sure. Didn't get a measure on speed at all.
Now I've got 500 of the 105 hybrids from Jerry to try. With a BC slightly higher than the 115 vlds these should be very interesting bullets!

Good to hear your happy with the 108 Bergers, just don't buy all of them or I'll sell my gun.
Cheers
Bucky

 

[NormB]

I shot a bunch of the 108 bts at 200m and they perform very well. At least as good as the Dtac. Way easier to seat than the 115 vld. I got several 5 rd groups in the 1/2- 3/4 inch range which translates in to .25-.33 moa at 200m. Pretty happy with that for sure. Didn't get a measure on speed at all.
Now I've got 500 of the 105 hybrids from Jerry to try. With a BC slightly higher than the 115 vlds these should be very interesting bullets!

What twists are you running to stabilize the 115/7's or the 108's?

NormB