300 black out. Accuracy expectations ?

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JasonYuke

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Just started fooling with full loads with my black out.

Little data little knowledge myself.

1:7 twist bolt gun.

Anyone using 175 smk full loads. ? I have tried h110 with decent results but I am sure there is better powder for accuracy ?

What are you getting accuracy wise.

Please share your experience if ur up for it.
 
best results with the heavies so far has been with IMR 4198.......I like the fact its a rifle powder as well.......
 
lets keep it out in the open........there are others playing with bolt rifles and we have to stick together on this with a data share program.....

150-225 grain bullets and IMR 4198

I started at the minimum charge of all powders listed on the updated hogdgon reloading data site, out of 6 powders tested with this range of bullet weight IMR 4198 5 shot groups where half the size of the rest with more consistent groups and less fliers. I have been going the sub sonic route as of lately but will once again go sonic in the near future as I want to see how fast I can get the dual caliber 225 grain bullets to fly, to date they have taken 3 hogs in texas sub sonic with excellent results........will post back when I have more info and data
 
Well, not sure if it will help you any, but last I checked Savage Arms was getting an average of 0.8"@ 100 yards, which was ostensibly the reason why they cancelled their project for a product line in 300blk. However, I haven't actually seen the case-by-case data, and that's only the average group size and doesn't say anything about first-shot cold bore accuracy, or the best total results, which is many times more important than group size.
 
Stevebot-7 said:
Well, not sure if it will help you any, but last I checked Savage Arms was getting an average of 0.8"@ 100 yards, which was ostensibly the reason why they cancelled their project for a product line in 300blk. However, I haven't actually seen the case-by-case data, and that's only the average group size and doesn't say anything about first-shot cold bore accuracy, or the best total results, which is many times more important than group size.
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Interesting, where did you get this information regarding the accuracy results you claim Savage was getting?

The best accuracy is more than likely going to be with supersonics. The most accurate load I've shot so far was an aggregate of 5-shot groups at .80 MOA @100 yards. This load was using 168gr. BTHP bullets over 14.7gr. H110 and a WSRP. Experimentation with primers yielded some varrying results. Federal No #100 primers appeared to work really well with this load but I don't have enough of them to do thorough testing. Cases are converted Winchester .223 Remington.

I think ones has to remember that the Blackout is NOT a benchrest cartridge and not to expect exceptional levels of accuracy. Practical accuracy I would think for 5-shot groups would be near 1 MOA for most quality bullets in my experience. For plinking, bulk Hornady 150gr. FMJ-BT bullets have been in the area of 1.50 MOA " 100 yds. based on loads I have shot.
 
I was thinking 168s as well !!

I exactly agree. My expected accuracy I would think is around Moa.

I have only fiddled with subs. Can't wait to try full loads.

Thanks for the info guys
 
I would be inclined to think a heavy weight flat based bullet would be most accurate at the relatively low velocities the Blackout generates. Sooo many bullets...too little time. ;)
 
Suputin said:
Has anyone spent any time with the 200gr Lapua subsonic bullet? That is by far the most accurate bullet I have ever used.
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not yet..........but by the end of this week you should be receiving some 225 grain round nose.........
 
Stevebot-7 said:
http://www.thetruthaboutguns.com/2012/04/foghorn/savage-scraps-300-blk-rifle/
http://www.thefirearmblog.com/blog/2012/04/18/savage-scraps-300-aac-blk-rifles/


Huh, now I'm not sure where I got the 0.8" number from. I could have sworn I got it from those two sites, but I guess not. Maybe it was some forum user's info, and not Savage's.
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I think Savage`s claim of poor accuracy was an excuse not too chamber the Blackout and reflects poorly on them. Think about it for a minute. Look over their selection of product. The majority of cartridges they chamber for would not have match grade accuracy under reasonable circumstances using factory ammunition. So, why hold the Blackout to this arbitrary goal.
 
2bad4u2 said:
I think Savage`s claim of poor accuracy was an excuse not too chamber the Blackout and reflects poorly on them. Think about it for a minute. Look over their selection of product. The majority of cartridges they chamber for would not have match grade accuracy under reasonable circumstances using factory ammunition. So, why hold the Blackout to this arbitrary goal.
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Savage didn't bother to research the cartridge, didn't understand its application, and had unrealistic expectations of it. Their offering was going to be a 20" barrel with a 1-10" twist. I think that tells you everything...
 
2bad4u2 said:
I think Savage`s claim of poor accuracy was an excuse not too chamber the Blackout and reflects poorly on them. Think about it for a minute. Look over their selection of product. The majority of cartridges they chamber for would not have match grade accuracy under reasonable circumstances using factory ammunition. So, why hold the Blackout to this arbitrary goal.
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I think it was some guys on Sniper's hide mentioning that the Savage test rifle had an 18" barrel and a 1:10 twist, which would certainly explain poor supersonic performance because you're very likely losing velocity with that much barrel, which might result in your bullet transitioning to subsonic mid-flight and gaining a lot of instability and turbulence. A different twist rate might also help. I think I'm going to sniff around for where I can get a Rem700 barrel. I think ATRS mentioned they could do one without much trouble.
 
Stevebot-7 said:
I think it was some guys on Sniper's hide mentioning that the Savage test rifle had an 18" barrel and a 1:10 twist, which would certainly explain poor supersonic performance because you're very likely losing velocity with that much barrel, which might result in your bullet transitioning to subsonic mid-flight and gaining a lot of instability and turbulence. A different twist rate might also help.
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300 BLK produces ca 2300 fps velocity with supersonic rounds. Somehow I don't think it will be going transonic in the first 100 yds, which is where accuracy is typically measured.


I think I'm going to sniff around for where I can get a Rem700 barrel. I think ATRS mentioned they could do one without much trouble.
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I have done a number of 300 BLK bolt gun bbls for guys on this board. PM me and we can discuss it.
 
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