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SL1 · October 24, 2012, 08:19 AM

I have manuals listing both IMR-4320 and H-335 with bullets running from 180 to 220 grains. So, I would think you could try those two powders that you already have.

For the Sierra 200 grain bullet, QuickLOAD seems to think that H-335 will give near the best velocity (with loads in the 35,000 to 40,000 psi range), but with only about 90% of the powder being burned in a 20" barrel. QuickLOAD indicates that IMR-4320 is less suitable, with substantially less velocity and only about 80% of the powder burned.

SL1

October 24, 2012, 08:19 AM	#6
SL1 Senior Member Join Date: November 8, 2007 Posts: 2,001	I have manuals listing both IMR-4320 and H-335 with bullets running from 180 to 220 grains. So, I would think you could try those two powders that you already have. For the Sierra 200 grain bullet, QuickLOAD seems to think that H-335 will give near the best velocity (with loads in the 35,000 to 40,000 psi range), but with only about 90% of the powder being burned in a 20" barrel. QuickLOAD indicates that IMR-4320 is less suitable, with substantially less velocity and only about 80% of the powder burned. SL1 Last edited by SL1; October 24, 2012 at 09:47 AM.