6mm 280ai sounds like a beast. I like it! I'm working with a 6mm PRC but haven't had the time to work with it much. The LRT should work out well for you. From what I've heard, LRT is not wildly temp sensitive but may not be as insensitive as some of the H series.I just was able to get 2 lbs of Ramshot LRT powder. Don't know anything about the powder. Looking to use it possible in a 6mm/280AI case. So the rifle is an overbore for sure.
My concerns are temperature extreme. I generally use H type powder to stay away for temp insensitive powders.
Yeah, I had a typo in there, 285 not 385 obviously. I have yet to run the LRT. When my Norma gets back I’ll get some data on it and hope for the best. I have a friend still back in AK who can run it in his and we’ll compare data and see what how pressure looks. We’ve run a lot of 285’s in the past but we both have a thing for the 300’s.The guy that had it before me ran the berger 300's and he said he was getting 3000fps with those as well. I ran mine by the Labradar yesterday and it was getting and average of something like 3003fps with an SD of 9. I shoot a lot of nosler 300gr custom competitions. I plan to test them in it after this elk hunt. I have a 21" regular 338 lapua barrel for this rifle too. I want to try the LRT in it. I'm getting 2635fps with H1000 and the 300gr8 bullets but I think I can do the same with less pressure with the LRT. I Amy also try the 250gr bullets in that 21" I think it will be an excellent handy hunting rifle.
Yeah almost 3000 fps with a 300 gr. bullet is smokin!Back from the range. Now the work begins. My specs are as follows. H-S Precision Pro-Series 2000 HTR rifle. 28" 1/9.3" twist barrel chambered with a PTG 338 Rogue reamer. APA FB3 brake makes it very pleasant to shoot. With an all up weight of 16#11oz, it's definitely not a hunting rig.
Some OALs touching lands with common bullets.
250gr SMK 3.772" OAL
285gr ELD-M 3.805" OAL
300gr NCC 3.750" OAL
300gr SMK 3.763" OAL
300gr OTM 3.890" OAL
Today's testing was done with LRT and 300gr Nosler Custom Comps at 3.730" over LabRadar.
No heavy bolt lift and primers look great at max with no cratering. 113gr shows faint ejector marks on the Hornady brass. This was 10 single shots. I'll load some 3 or 5 round sets starting at 110gr and see what it does for consistency. This rifle is promising to be a beast.