Originally Posted by linksmechanic
lil tank: which caliber?
I'm playing around with my .308 Winny. It has a custom 1" contour Mil spec barrel found at a military reclamation by the Fish Commission. It is a 1:10 twist that started out as a 30cal M1 carbine test barrel that is reamed to a .308 comp spec chamber. Still had the cosmoline in the rifling. It cleaned up nice and I think is finally breaking in after 400rnds. It is a very dense hard steel.
Anyway, I put together a load that tested well yesterday at 100yrds. I used 48.0 grns of RL17. I'm using Wolf primers and 168 A-Max at a COL of 2.256". Norma brass at 2.010" trimmed. 40% humidity, 27 degrees.
I shot a group of .618 MOA. It was a horizontal, so I am blaming that on me. I had a lot of clothes on and it was difficult to settle it, but CTC came out to a little over .230". I am going to shoot it across the chrony today and see what my velocities are. I am hoping for around 2650, but that might be a stretch.
I do feel confident that I could come up another grain if I could get it in. All I have right now is a 4" drop tube and it is at 100% compaction right now. The nice thing is that I was expecting this load to shoot low with my current zero. I am currently shooting 135grn SMK's at 2800fps with H335. My zero didn't change vertically with this new load. Very interesting thus far. This might be a good candidate for an ackly improved chamber.
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