New ELR Rig

[brando]

I've been busy lately, so I haven't made a whole lot of progress with this barrel, but I wanted to show you the difference between the standard .338LM cartridge and the .338LM Improved. I normally run about 92.7gr of N570 as my standard 300gr load, but with the extra room in the improved chamber, I expect to be able to get similar pressures with 98gr and therefor significantly more velocity (the 36" barrel will help with that too). I've made pressure testing loads up to 103gr (that's just shy of compressed), though we'll see where the pressure signs show up. If the cutoff is too early, I'll try RL33. The goal is to push 300gr Scenars to 3100+ fps.

[bombadillo]

What do you notice on the gain twist? Supersonic longer, velocity, bullet stability, or what? I've been curious about the theories on gain twist or T-Rifling as Bartlein calls it. What are your thoughts and observations on it since switching?

[brando]

Not enough data to come to a conclusion yet. Honestly, I didn't ask for the T-Rifling, it just so happens that the barrel I was looking for had everything I needed plus that.