Barnes 115 gr TAC-TX for the 6.5 Grendel

White Smoke

Black powder rules!
May 2, 2011
206
27
28
119
Encinitas, CA
This is a fairly new bullet that was designed by Barnes specifically for the 6.5 Grendel. No one seemed to be able to get their hands on any, but John at Fine Firearms managed to get two boxes for me. THANK YOU John! I loaded up a couple of ladders the other day and finally got to the range. 26.0 grains of Reloder 15 gave a four-shot group of 0.81" and 26.0 grains of IMR 8208 XBR gave me a 0.69" group. Previously, I tried the 100 and 120-grain Barnes TTSX bullets, but could not get them to fly. These 115 TAC-TX's are dynamite with the Grendel!xbr.jpg20200303_162053.jpg
 
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Truduct

Well-Known Member
Dec 20, 2014
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We have the 308 110g tac-tsx shooting awesome in the boys Black out. Great bullets and they perform well at low velocity.
 

White Smoke

Black powder rules!
May 2, 2011
206
27
28
119
Encinitas, CA
Just shot another ladder today using H335. I got one group with 28.0 grains that measured 0.72" and another at 27.5 grains that had three of the four shots touching plus a called flyer. (My son torched off a 45-70 right next to me as I pulled the trigger). I'm going to be making up two five-shot loads at 27.5 and 28.0 just to confirm and see if I can get that 4-shot touching group. I also got some CFE223 and will be building a ladder using that powder. That SHOULD do it for the testing...I hope! The flyer is marked with a pen line coming in from the left.
 

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Aeon

just a dude who duck hunts
Feb 16, 2011
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How broad were your nodes impact or speed? Did you do it in 2/10ths of a gr increments.
 

White Smoke

Black powder rules!
May 2, 2011
206
27
28
119
Encinitas, CA
I shoot 4-round groups from the starting suggested load to the top load in half-grain increments. Once I find the best load, I shoot five more to confirm. If the patterns on either side of the "best" group don't match, I sometimes do a spread around the "best" in 2/10 increments to find the "real" best load. I don't usually chronograph a load until I find my final "best" load.
 

Aeon

just a dude who duck hunts
Feb 16, 2011
3,068
1,565
113
So ladder tests are a lil different and something you can all do. here is a good write up on how to do them and why they work.
The basic idea is you are looking for a node where a couple shots have close to the same impact and or speed. Think of the barrel whipping and you want to catch it on the sweet spot. You can run ladders with powder charge changes, primer, and seating depth. They can be a moving target as you shoot barrels wear and lands move so whats good today at shot 100 might suck at shot 700 on a fast burner.

shooting groups is good too and does work but wont show you the broad node you want to get the most out of your rig. Groups also induce shooter error and other things that can trick you into thinking you got it nailed.

my personal method is ladder test at 2/10ths gr increments. then seating test to bring it the rest of the way. I cheat all the time and stop if the gun shoots good with the break in loads. I am in that boat right now with the 7 saum. Its shooting lights out good with the break in/fireform loads and i am so tempted to just keep banging away at it. in competition on sat at 1k yards 8 of 20 shots were in a 1/2moa circle at 1k yards. The rest were basically in a 1moa circle.

as always 1" groups are easy but 1/2" will cost you :)

***EDIT**** forgot neck tension plays a part too. When things are not working right at all i will move that in and out .001 to .005ths
 
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White Smoke

Black powder rules!
May 2, 2011
206
27
28
119
Encinitas, CA
I also play with the seating depth once I get the final powder load. This Grendel has gotten spendy. I have been shooting a lot of bullets trying different powders to find the one combination that works best. The big cost was all the Barnes 100 and 120 TTSX's that never worked out. I've gotten the new 115 TAC-TX's under an inch with several powders. I have one more ladder to shoot using CFE, which is the one Barnes recommended. Hopefully, I'll get to the range this Friday.