ramshot-tac question

[Hannu]

Tried TAC with Hornady 75gr BTHP in STI rifle. I did not got very good accuracy though. I shot best results with Accurate 2520 and Varget.
Brass Winchester, primer Federal 205GM and col 2.30"
I began from 23.5 grains and max load used was 24,9 grains. MV with max load was 2680 fps from STI 16" barrel.

Please note, this is way over published max ! STI:s long freebore allows long col and I can get 2.30" to my magazines (STI:s freebore would allow around 2.35"). Both col and long freebore reduce pressure significantly compared to SAAMI min. test barrel and shorter col.

[tmckay2]

what twist barrel did you have?

[SA Friday]

I've played around with Tac and 75's, but not enough to have a pet load set up. I've mostly shot 55's and 69's with it and gotten smoking accurate loads with it. Hoser may have more info about 75s and TAC, but it's a fairly new powder on the 223 scene in comparison to Varget and 2520. I was playing around in the 23.0gr area.

[tmckay2]

yeah i got some crazy accurate loads with reloader 15 and 75s. its tough because every weapon is different and some like some loads and not others. but i was just wondering if anyone had any half way decent loads with the ramshot tac. i may try it in 62s first and see what i can get

[Hannu]

STI says it is 8" twist, I have not gauged it though.
I got averaged very close to 1" 5 shot groups to 100 yd, but I do not consider that kind of accuracy as "good".
Groups started to spread quickly when I went over 24,0 grains.

[tmckay2]

yeah its funny how powders work like that. i used 23.5 of reloader 15 for my 75 grains and it was crazy accurate, bumped it to 24 and it was all over the place

[esaabye]

I found I had good luck with TAC at 23.5 and Siera HPBT 69gr in a 1/9 20inch. 24gr seems to do just about the same but I need to eval at full distance (200-400).