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Posted: 7/1/2019 7:15:49 AM EDT
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Old thread: https://www.ar15.com/forums/Armory/N32C-Tin-Star-equivalent-of-The-Load-in-308-Win-updated-with-range-report-/42-497354/
Pardon the lack of chrono numbers. I barely got to squeeze this in the range trip while helping a college youngun train. Dad has insisted on not using Hornady 150gr FMJs and ordered some Speer 130gr Varminter HPs. I reckoned the charge node might move up some. While loading Saturday, I confused the prior data for .308 and .30-06 which was 15gr and 16gr under a Hornady 150gr, respectively. Instead of 15.0, 15.5, and 16.0gr - I loaded 16.0, 16.5, and 17.0gr with the bullet seated to 2.650" (not sure how much jump). The latter two had a couple of stickier bolt lifts; not sure if pressure related. 16.0gr looks sufficient. Attached File Disregard a little bit of the left-right. I was pushing the handstop against the sandbag, but the securing handle put a little twist in the position which I think affected recoil repeatability. @Reorx |
Thanx for the follow up. I have to admit that 16.0 looks like a sweet spot - Noice! Having said that, I'm crazy and would try to "fine tune" it!... I would load up some @ 16.0 and ± 0.1 and ± 0.2 (i.e. 15.8 to 16.2 in 0.1 increments) and shoot some more paper just to see if what you have is as good as it gets. If they all shoot as good as what you have, you can feel good about being in the middle of the node which would make it easier to load more/faster!... 
As an added plus, the next go 'round you can get some chrono numbers! 
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The benefits I know of is 60% less cost for powder, less recoil so you don’t beat yourself up as much, more sensitive to follow through errors, so better training, less barrel wear and throat erosion during practice.
***edit There is a savings in bullets too since you can use a lighter varmint bullet or even a cast/coated bullet instead of FMJs or match bullets. |
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Lower cost per round (ok, more rounds per pound), lower cost by barrel life, lower recoil. It's an upscale .22LR with less brass fuss than .300Blk. Good for wind practice at 200yds; maybe 100 if it's wide open.
N32C is more expensive, but it's bulkier than Red Dot and seems to be better speed-wise than Trail Boss. |
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Dad shot this load in today's local HP match. He noted that 8/10 extractions were sticky, requiring more force to fully unlock the bolt. The brass is LC 58 with several firings, so hardness could be one factor. The headspace is bumped 0.005" (excessive, but better than the 0.0005" before sanding the shellholder), so I wonder if it's possible for the faster powder to stretch the web more radially than medium speed powders would, though with a lower theoretical chamber pressure that doesn't make much sense. I think I'll work with FC brass next time. |
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