130gr ttsx with ar comp in 308win

[Cadman458]

So i just started reoading this year and was wondering if anyone has tried a 130gr ttsx in a 308win with ar comp powder. what i have is:

ruger gsr 308win with 16" bbl 1:10 twist and trijicon accupoint 3-9x40 scope
lee single stage press
lee dies
lee safety scale (i weigh ALL my charges)
lyman case trimmer
once fired lake city brass fl sized and trimmed with swaged primer pockets
winchester large rifle primers

if nobody has tried this combination would it be safe to reference varget data and reduce the charge to take account for the thicker lc brass and the ar comp powder? from what i understand ar comp has a burn rate between rl15 and varget. if this is possible could someone recommend a starting load? below ill list some data from barnes, alliant, and hodgdon if it helps...

http://www.alliantpowder.com/reloaders/powderlist.aspx?type=1&powderid=35&cartridge=80

http://www.hodgdonreloading.com/data/rifle

http://www.barnesbullets.com/wp-content/uploads/2007/02/308WinWeb.pdf

speer 130gr hp
47.6gr ar comp
50.0gr varget (compressed)

sierra 155gr hpbt
43.2gr ar comp
47.0gr varget (compressed)

150gr nosler etip
?????? ar comp
46.5gr varget (compressed)

150gr hornady gmx
44.5gr ar comp
?????? varget

130gr barnes ttsx
?????? ar comp
52.0gr varget (compressed)

these are the MAX loads using federal 210 or 210m primers and federal or winchester brass. i threw in the known data for the etip and gmx bullets simply because its a non lead bullet if the same weight. (not sure if that helps or not tho bc they are both non banded where the ttsx is banded) so yeah anybody have any suggestions? (sorry for the long first post. just wanted to be thorough)

EDIT: oh and the reason i dont simply use varget powder and run with known data is to me varget is kinda like a unicorn. ive heard all about it but never seen it in real life. ar comp was the only powder locally available that i could get a decent supply of and so far ive gotten pretty good results from it. (.65 group at a hundred yards with a speer 165gr btsp bullet.)

 

[waffentomas]

I've not used this combo, but I'd measure the length of the bullet, it's probably about as long as a 165gr standard cup and core bullet. If it is, my starting load would be 42gr. That's probably going to be pretty slow for a 130gr bullet, but it'll be safe, and you can work up. Barnes has these things flying at 3200 +/- fps, so you'll have a lot of playing to do, as 42gr of AR Comp will probably get you around 2700fps

 

[jmr40]

I load 130 TTSX's with 48 gr of TAC. They are giving me 3050 fps from a 22" barrel and excellent accuracy. If you do run across some Varget I've used it in the past and got about the same speed and accuracy. I don't recall the exact load.

For a while Varget was had to find locally and I wanted to save what I had for heavier 150-168 gr bullets. I've since ran across a good bit of Varget and am in good supply. I tried the TAC, simply because it was available, and came well recommended from some other shooters.

I'm not going to even touch the topic of guessing on powders. It may work, and I know some do it. I'm just not comfortable with that. When changing bullet brands, brass or even primers I'm not opposed to starting light and working up using a chronograph to verfy as long as I stay with the same bullet weight.

I'm not saying it can't be done safely. Just that for me I'd find data for the powder I had, or find a powder I do have data for.