Vihtavuori N340/N320 load data? 124gr Nuke and 147gr RN

[Ben]

I am trying to figure out some loads for these bullets. The 147gr stuff ive been using 3.9-4gr of N340 and a 1.135 seating depth (for the TC bullets, not the RN 147gr). I suspect the RN will perform similarly with the same powder load and roughly the same COL.

Its the 124gr NUKEs that im a little unsure of. VV doesn’t have data for a similar shaped/weight projectile and i see one 124gr load with a (N340) max of 4.6gr and another with a minimum of 4.4gr.

Does anyone have any experience with these using N340 (or N320) or similar projectiles using those powders?

[Peter Turner]

I have successfully loaded N320 with the 147 FN “Heavy Match” RMR bullet for subsonic loads to use with a suppressor. N320 is supposed to burn clean and best of all it is 100% burned according to Quickload calculations. I am trying to reduce the amount of filth that a suppressor inherently drives back into the firearm.
Specifically I charge with 3.5 grain of N320 and seat the bullet to a COAL of 1.110 inch. That bullet is 0.625 inches long so if you use the round nose, just measure it and seat the bullet to that difference plus the 1.110 to get a COAL that yields the same case seating depth, hence about the same pressure. My load yields 902fps muzzle velocity in a Sig P226 with a 4.4 inch barrel, as measured with a Labradar unit . The load cycles well in all my firearms tested with or without the suppressor and includes a Ruger PC 9mm with 16 inch barrel.

[Author]

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