Extreme 200gr rainier 180gr N320 loads

[drewbeck]

I got lucky enough to find enough N320 to switch from WST. I've been searching but having a hard time finding data in the mid length of 1.165-1.17 range.

Does anyone have good load data for N320 .40 at 1.17 OAL for a 5" STI barrel for the following bullets?

Extreme 200gr

Rainier 180 gr RNFP

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[Scooter567]

Everyone seems to run 4.8-5.0 gr. N320 for the 180 gr bullets. Loading up some right now in fact. For STI most people are running a coal of 1.170 to 1.180. That's what I run, and that's what I have found dead from searching the posts here on the Enos forums.

[Scooter567]

Don't known how the word dead got in there

[fastarget]

Everyone seems to run 4.8-5.0 gr. N320 for the 180 gr bullets. Loading up some right now in fact. For STI most people are running a coal of 1.170 to 1.180. That's what I run, and that's what I have found dead from searching the posts here on the Enos forums.

might be a hot load for a 180, and very hot for a 200, start low and safe .....may I suggest 4.5-4.6 and chrono for 180........maybe 4.0 for the 200gr. 200 are best best loaded long.

[bulm540]

4.3 grains with zeros if I can remember correctly. gun was SV LDC.

[Blacksamwell]

I worked on a major PF load for the 200gr Xtreme w/ N320 for my CZ TS but never acheived the necessary velocity and gave up. N320 worked for plain cast lead 200gr slugs and is a fantasticly soft and accurate major load. But the Xtreme bullets were substantially slower and less accurate with the same powder charge.

I pushed my Xtreme loads all the way up to 4.0gr of N320 at OAL of 1.160 and 1.130. This data was collected on a hot July day with a temp of 92 F. I was using mixed brass and S&B primers.

Xtreme 200gr RNFP @ 1.160" w/ 4.00gr N320: 776 Average, 36 ES, 11 SD

Xtreme 200gr RNFP @ 1.130" w/ 4.00gr N320: 783 Average, 39 ES, 14 SD

My 200gr cast lead loads with N320 give me major velocity at 3.90gr of powder at the 1.160" length with standard deviations as low as 5fps. The Xtreme loads weren't showing any of the usual pressure signs but their standard deviation figures were getting worse as I added more powder. That along with the worsening groups lead me to declare the major power factor experiment for that bullet/powder combo a failure. Others with more tollerance for playing with high pressures could likely make it work.