Finally got back to the range to test out two different loads for this rifle.

The first was 170gr LRN .358 bullets over IMR 4198. No happiness. Only 2 of the 4 rounds fired impacted the target at 50 yards.

Next tried 180gr jacketed hollow points over the same powder. Nice enough group with 2 shots from each barrel, with left and right barrels shooting to same horizontal point, but separated by vertical stringing of 3". Overall group was also 3" right of bullseye.

I'll retry with more 180gr JHP rounds, hopefully when it's not in the 90s like yesterday.

I am going to re-slug to confirm the 0.358" measurement I got last time. This sure would be easier if I could use factory ammo after resizing the cases using tape around the case up 1/3" from the rim. When I do this with loaded or empty cases, I'm able to get them to chamber. The problem with the smaller diameter (.358") vs normal (.366") is that my CH4D dies open the necks up for the larger bullets. So the smaller ones risk falling inside the case as I'm crimping. That happened often until I started running the cases into a 357 Maximum die to compress the neck.