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Joined: Dec 2015
Posts: 6
New Member
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OP
New Member
Joined: Dec 2015
Posts: 6 |
Looking to an alternate powder for .223 26" heavy barrel bolt gun other than H335 I bought a pound of 8208 xbr. Made (3) test loads each starting at 24.3 24.6 24.9 25.2 Using 55g V-max with a OAL 2.250 here are the results:
24.3 fps 3122, 3094, 3112 group size .620 24.6 fps 3193, 3165, 3174 group size .710 24.9 fps 3245, 3212, 3261 group size .512 25.2 fps 3321, 3332, 3344 group size .367
It seems this powder performs better at closer to max levels. there were no signs of pressure at 25.2 which suggests I could increase load volume if desired (book values 23.0 to 25.3 max) However, i'm happy with the velocity i'm getting. I will adjust OAL and search more for the magic spot before increasing load.
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Joined: Dec 2007
Posts: 1,523
Campfire Regular
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Campfire Regular
Joined: Dec 2007
Posts: 1,523 |
My understanding from guys using if for Highpower competition is that this powder really spikes the pressure as you get up there at max. Not as linear as H4895 for instance. So go slow and make small changes like you have already. I have a pound but have not tried it yet.
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Joined: Jul 2009
Posts: 885
Campfire Regular
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Campfire Regular
Joined: Jul 2009
Posts: 885 |
It works great in my remington 700vtr 308 43gr and a 168gr matchkings
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Joined: Dec 2007
Posts: 1,258
Campfire Regular
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Campfire Regular
Joined: Dec 2007
Posts: 1,258 |
I use it in a match gun with 75gn and and 77gn bullets. It performs well but does get spikey.
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Joined: May 2011
Posts: 56,326 Likes: 9
Campfire Kahuna
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Campfire Kahuna
Joined: May 2011
Posts: 56,326 Likes: 9 |
Good to hear the firsthand experience and the spiking issue. I need to try some in a 338 Federal. Hows the temp stability?
_______________________________________________________ An 8 dollar driveway boy living in a T-111 shack
LOL
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Joined: May 2009
Posts: 17,276 Likes: 1
Campfire Ranger
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Campfire Ranger
Joined: May 2009
Posts: 17,276 Likes: 1 |
Great in the 35 Whelen. 200 accubonds with 57gr at 2750 and moa
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Joined: Nov 2010
Posts: 37,162 Likes: 3
Campfire 'Bwana
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Campfire 'Bwana
Joined: Nov 2010
Posts: 37,162 Likes: 3 |
Are we looking at a relatively narrow window of opportunity between optimal near max performance and spikes?
DF
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Joined: Sep 2007
Posts: 3,612
Campfire Tracker
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Campfire Tracker
Joined: Sep 2007
Posts: 3,612 |
Great in the 35 Whelen. 200 accubonds with 57gr at 2750 and moa I'm 100 fps faster with the exact same charge except I have a custom 24" barrel and used CCI 250's. Shoots great and is one of my favorite loads. I have never noticed any pressure problems but don't hot rod my loads which I think is the real source of "pressure spikes"
Gerry.
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Joined: Jul 2012
Posts: 392
Campfire Member
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Campfire Member
Joined: Jul 2012
Posts: 392 |
It works great in my remington 700vtr 308 43gr and a 168gr matchkings ^^^^^ Exactly, except my .308 is a 5R. One hole at 100 yards.
Browning X-Bolt .30-06 Leupold VX-3i 4.5-14x50 CDS Tikka T3x Lite 308 win Leupold VX-3i 4.5-14x50 CDS
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Joined: Jan 2002
Posts: 4,288
Campfire Tracker
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Campfire Tracker
Joined: Jan 2002
Posts: 4,288 |
I have used IMR 8208 XBR in two 6 BRs and a 30 BR. I have loaded beyond max with these chamberings to learn what the limits were and there were no spikes.
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Joined: Dec 2007
Posts: 1,258
Campfire Regular
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Campfire Regular
Joined: Dec 2007
Posts: 1,258 |
I've never had to load it up really high to get the MV I was looking for or great precision; my experience is confined to 75-77gn in .223 Wylde and 175gn in .308 Win although I will use it under 123gn in a Grendel soon. I do find that it gets spikey if you are using a compressed load sort of like RL17. More than anything I find that I get really high port pressures and over gas in AR if I use hotter loads of 8208.
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Joined: Nov 2010
Posts: 1,611
Campfire Regular
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Campfire Regular
Joined: Nov 2010
Posts: 1,611 |
Works well in my 7-08...very well.
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