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what powder for 300 RUM

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Unread 01-18-2009, 04:46 PM
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Join Date: Aug 2007
Location: bismarck ND
Posts: 406
Re: what powder for 300 RUM

i agree with joel also but at the same time i dont want temp sensative powder. thats why i want to start with h1000 or retumbo. Unless you guys that have a 300 rum in a 26in barrel so go faster then i will try that. i am mainly looking for a starting point.
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Unread 01-18-2009, 05:34 PM
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Join Date: Jul 2006
Location: Harrisburg, PA
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Re: what powder for 300 RUM

Since Retumbo and H-1000 are so close in burn rates, pick one and start around 89-90 grains. Move up one grain at a time while measuring case stretch to determine when you are approaching max load. Don't exceed .005". You'll find it somewhere around 93.0 with Retumbo and maybe a grain or two more with H-1000.
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Unread 01-19-2009, 10:18 PM
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Location: The rifle range, or archery range or behind the computer in Alaska
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Re: what powder for 300 RUM

My ABS 300 RUM 11.25x HATES Retumbo, likes H1000, H50BMG (with the 208's-220's), RL-25 and very little else.

Beware that you most likely will NOT want to use the same charges in your barrel as you commonly hear about. I hear about 93+ grains under 200-210 bullets alot. In the last 2 custom 300 RUM barrels I have owned including my ABS barrel I can get 92.0 MAXIMUM for a 180 grain variety and depending on the bullet it is 90.0. H1000 with the 200 AB wont do squat for me with any charge. However, H1000 under the 208 AMAX is awesome. So is H50BMG with the 208 and 220 SMK. The 178-180 likes 90.0 of it. RL-25 has worked with all the bullets I have tried from 180-200 grains. Again, 90.0 grains is max for the 180's and 86-87 is max for the 200 AB.\

Youre rifle will be different. Try several powders.

NOTE: Both my 12x and 11.25x barrels like 178's and 180's with 90.0 of RL-25 @ 3300 FPS. And 86.0 RL-25 @ 3100-3150 under the 200 AB. These maybe "pet" loads????? 2 barrels liking the same loads? Sounds like a sweet spot.
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