New DTAC 115gr Rebated Boat Tail Bullet from David Tubb

[Capt. Yoda]

Die manne in die US wag al lank vir die koel, teen 3000fps gaan dinge lekker raak

http://bulletin.accurateshooter.com/201 ... avid-tubb/

http://accurateshooter.net/pix/dtac1611501.jpg

David Tubb has come out with a new, improved version of his heavyweight 6mm match bullet. David’s new DTAC 115gr 6mm projectile is very slippery — the tested G1 1000-yard BC is 0.620. The DTAC 115 features a Rebated Boat Tail (RBT) design and a factory-pointed tip (what David calls a closed nose). This bullet is in production now, priced at $145.00 for 500 bullets. David tell us the new DTAC 115 has arrived and his company is currently filling backorders. New orders will be taken at DavidTubb.com starting Monday, August 15th. You can also call 806-323-9488 (8:30 am-4:30 pm CT) to order.

David explained the two main reasons why the Rebated Boat Tail (RBT) design was chosen for the new DTAC 115 bullet

1. It is easier to precisely hold tolerances when manufacturing the 7 degree boat tail angle. Most conventional boat tails have 9 degree angles (or greater).

2. The RBT more efficiently obturates to the bore of the rifle barrel when fired. (It mimics a flat base bullet design). This will allow the RBT design to extend your accurate barrel life by reducing gas leakage around the bullet when fired in a worn 6mm throat.

NOTE: David does NOT claim the RBT offers a higher BC compared to a conventional boattail design.

DESIGN FEATURES: DTAC 115 Bullet with Rebated Boat Tail

Commentary by David Tubb
In the 1980s we shot 107 grain weight-range 6mm bullets for Silhouette and High Power competitions. Lower recoil and good wind drift were paramount in coming to the 6mm bullet diameter.

After I developed the 6XC case around 2003 I approached Sierra about making me a 6mm bullet in the 115 grain range. Sierra ran prototypes in 112, 115, and 120 grain configurations. I thoroughly tested these and decided on the 115 grain. In 2004 I used these at Camp Perry and the result was a Long Range National Championship Aggregate with a perfect 1450×101 score. Enough said….

In 2007 Sierra had just introduced its plastic-tipped bullets. I had them run a test batch of plastic-tipped 117 grain weights. These didn’t pass my criteria.

We then ran another test batch of 111 grain plastic tip 6mm bullets and they looked great in the Sierra tunnel tests. However when shot them over an Oehler 43 at 1000 yards the results indicated the plastic tips were deformed or nonexistent at the target. These didn’t pass my criteria.

FYI — that plastic tip deformation testing information preceded the Hornady “Plastic tips Are Bad” advertising campaign by more than seven years.

When using a .308 early in my High Power rifle career we shot 190 grain Sierras at the 600-yard stage. When 600-yard accuracy began to fall off a switch to a 185gr Lapua rebated boat tail brought the accuracy back. I remember shooting some very high X-Count scores with 185gr Lapuas. The reason the Lapua worked in a worn barrel is because the rebated boat tail allows the bullet to obturate to fit the worn throat and prevent less gas leakage around the bullet when fired.

I had a bullet-maker friend reform some 6mm 115s with a rebated boat tail (RBT) in 2015 and had excellent results. So it was a natural move to redesign the current DTAC 115 6mm with a RBT and a 7 degree boat tail.

Ballistic Coefficent and Stabilization

High BC Confirmed
David says, The new DTAC 115 RBT testing is complete and [we] can claim a G1 1000-yard BC of 0.620.

Required Twist Rate for Stability
David reports: This bullet stabilized out of true 1:8 twist or faster barrel at velocities approaching 3000 fps at sea level.

[Capt. Yoda]

Ook interesnt wat hy hier se as mens na Hornady se nuwe koels kyk

We then ran another test batch of 111 grain plastic tip 6mm bullets and they looked great in the Sierra tunnel tests. However when shot them over an Oehler 43 at 1000 yards the results indicated the plastic tips were deformed or nonexistent at the target. These didn’t pass my criteria

[Hein22]

Ek wonder of die RBT design regtig die voordele inhou wat hulle se dit doen. Ek het al heelwat opgelees daaroor en hoe meer ek lees hoe meer is ek oortuig dat die ontwerp daar is omdat dit makilker is om te maak sonder om tools te breek, nou probeer die vervaardigers daarvan maar 'n goeie "spin" daarop sit om te maak asof dit die plan was van die begin af.

Beteken natuurlik nie dat die koeels nie kan raak skiet nie, ek se maar net.

[Fritz]

Wat is G1? Ek dog dis iets waarmee mens 'n pad bou

Die koeeltjie lyk baie nice en hy gaan mooi werk. Die pointed tip gaan al klaar baie help. Ek sien noudiedag die 142gr SMK in die 6.5 is ook gepoint in die fabriek.

[Piet Pille]

Wat is G1? Ek dog dis iets waarmee mens 'n pad bou

Die koeeltjie lyk baie nice en hy gaan mooi werk. Die pointed tip gaan al klaar baie help. Ek sien noudiedag die 142gr SMK in die 6.5 is ook gepoint in die fabriek.

G1 is 'n standaard waarvolgens die Balistiese Koefisient gemeet word. Daar is die G1 metode en die G7 metode

[swc-tr]

Wraggies??

[Piet Pille]

Wraggies??

Dis wat google se.... ek dink egter ook dis eerder 'n padbou ding...
Sal my vrou vra, sy weet meer as google

[swc-tr]

Fritz terg net bietjie.
G1 se sleur model werk goed vir koeëls wat baksteen vorms het, die slim Amerikaners behoort dit nou al te weet, nadat Bryan Litz hulle moes reghelp.

[dehacked]

Ek wonder of die RBT design regtig die voordele inhou wat hulle se dit doen. Ek het al heelwat opgelees daaroor en hoe meer ek lees hoe meer is ek oortuig dat die ontwerp daar is omdat dit makilker is om te maak sonder om tools te breek, nou probeer die vervaardigers daarvan maar 'n goeie "spin" daarop sit om te maak asof dit die plan was van die begin af.

Beteken natuurlik nie dat die koeels nie kan raak skiet nie, ek se maar net.

Almal doen dit. Hornady se nuwe reeks met die tips wat meer hitte bestand is, is ook maar 'n twist op fout met die design spec van die huidige tips.

Soos ek verstaan is daar wel voordele in plat basis vir gas seel sowel as kontak breek met kroon so nie noodwendig 'n sleg plan nie.

[swc-tr]

Almal doen dit.

Absoluut, amper soos die Nazi propaganda teorie tydens WW2: as jy dieselfde snert oor en oor verkondig, gaan baie jou begin glo.