I've heard of people hitting pressure in Dasher before, but not GT. Know a few guys who run it as a substitute for Varget because that's all they could find and it seems to work well for them in the GT. I've got a bunch of it but haven't tried it in my GT. Still one of the few burning through circa 2004 Varget lot numbers.
Did you have good luck with the dtacs? I switched to 109 lrht but have been thinking about trying out some dtacs.
Ive read the only SW powder with similar temp stability as the Hodgdon equivalent was Precision being near same as Varget, the rest being noticeably more prone to temp related velocity swings. Have you found SW long rifle to be relatively temp stable?
I use SW Precision in a couple other cartridges and it's very temp stable.
Thanks...
Cratered primers, ejector marks, and 3000fps....
What primers are you using? Just got a barrel and I have pretty much the same components you’ve listed and or pictured just curious as to the brand of primer.
Those primers are trying to tell you something. Actually, they’re screaming it. I’d imagine those primer pockets won’t last long.
I'd come down in .1 or .2 grain increments depending on how much brass/powder/time you have and find out A) where that primer issue stops happening and B) where the upper node is and how big it is. For example, let's say the primers start looking good at 33.6 and the velocity is 2990 then you go 33.4 33.2 and they both shoot 2975 with idy bidy groups and the sd is 4-5 you then would know there is a nice velocity node there that's not on the edge of over pressure. I just had my 5th 6.5 SAUM barrel give me a reminder recently that every barrel is different and there are no shortcuts in this game. I was getting all excited at how good it was shooting and tried to rush the process only to have it speed up 100 fps on me at the 150 ish round mark and ended up having to pull about 200 loaded rounds. Bummer, dropped the charge back down in the manner I just suggested and it's hammering again tiny groups and low sd's. It was frustrating and time consuming but the finished product is worth it.
34gr is a pretty standard load for 6GT. No use in doing a bunch of ladder work on a brand new barrel. Plus I had no pressure signs previously. This was the first time seeing something like this, about 300 rounds down the pipe. Obviously- im going to make a change.
Another option worth looking into is the Impact 737r, Altus has them in stock and will do a barreled action deal.
www.altusshooting.com
I have been running an impact action for the last three years, actively compete in PRS comps both pro and regional. I love the action and have had zero complaints or failures with it... Tate Streater makes a great product, supports our sport, actively competes, match directs and is just a great guy! He is the T in JTAC if your ever looking for some training too.
Impact is a superior action IMO. You may be splitting hairs, but there is a reason about half of PRS shooters nationwide run an impact. Its an updated surgeon which was the golden standard of actions for over 10 years.
