I have a left hand gain twist 224 barrel up at MHS also, I am waiting for it to get machined but I'm going 24" for my TL3. I can't wait to try it out, it will be my first gain twist barrel.
I have an AMP with the AMP Mate and a Dillon case feeder. Make sure you update the firmware right away. My AMP mate works great, I don't have any issues with it jamming up but you do have to spend time setting it up for each caliber.
Just picked up my TL-3 yesterday from Bighorn and also talked to Mike at Mile High, my 224 left hand gain twist barrel showed up so I should have this put together soon. Looking forward to trying out the gain twist barrel!
I ordered an AMP annealer from Brownell's and had to wait 4 months for it, they still honored the 10% off promo code I used with no issues and it was the only item on the order.
I just received my mark II also, already had the AMP Mate sitting here for a bit. I had it set up and running in about 10 minutes, it's fast! I ordered a Dillon case feeder today but still need to order the Creedmoor Amp Stand Kit. Does anyone have the case feeder set up with the Amp Mate yet?