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Author Topic: 300 cal 68 gr. BBT Group Buy bullet performance  (Read 490 times)

Archshadowman

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300 cal 68 gr. BBT Group Buy bullet performance
« on: July 27, 2017, 07:53:24 AM »
Hey guys, I'm interested how these bullets perform.  I have a Flex in .30 on the way and I'm considering giving them a try.  I think Bullfrog posted somewhere out there that his .30 Flex likes them.
I talked to Jim at WAR and asked him about them and he called someone that knows a little more about them to get some info about the round (maybe it was Bob but not sure).  He was told that they are not recommended for choked barrels such as the Flex has.  Some real world data or opinions would be greatly appreciated.
Thanks
Mike M


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rsterne

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Re: 300 cal 68 gr. BBT Group Buy bullet performance
« Reply #1 on: July 27, 2017, 08:07:38 AM »
It wasn't me, I have no experience shooting bullets from choked barrels, good or bad....I know that some guys have had success,  once they find the right diameter to size them to.... but don't know what that is....

Bob
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oneshot61

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Re: 300 cal 68 gr. BBT Group Buy bullet performance
« Reply #2 on: July 27, 2017, 04:17:08 PM »
I have shot 357, .25, .22 bbt out of choked barrels. Sizing them down is the key. I would suggest slugging your barrel through the choke to find the best sizing.

rsterne

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Re: 300 cal 68 gr. BBT Group Buy bullet performance
« Reply #3 on: July 27, 2017, 04:32:17 PM »
Thanks for that, oneshot61.... Do you size to the groove diameter at the muzzle, smaller, or larger?....

Bob
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nielsenammo

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Re: 300 cal 68 gr. BBT Group Buy bullet performance
« Reply #4 on: July 27, 2017, 05:46:14 PM »
Bob, my Daystates are choked.  I size for the choke.  The barrel slugs like .219 and they are .217 at the choke.  I shoot 33 grain .217 swage slugs that will shoot 1 inch groups, maybe a bit better when stars align if I get out there before the wind picks up.
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rsterne

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Re: 300 cal 68 gr. BBT Group Buy bullet performance
« Reply #5 on: July 27, 2017, 05:57:42 PM »
So you size to the groove diameter at the muzzle.... Good information, I keep getting asked that question.... Thanks....

Bob
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oneshot61

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Re: 300 cal 68 gr. BBT Group Buy bullet performance
« Reply #6 on: July 27, 2017, 08:48:22 PM »
Yes sir, what Mr Nielsen said. Seems to work.

Archshadowman

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Re: 300 cal 68 gr. BBT Group Buy bullet performance
« Reply #7 on: July 31, 2017, 06:34:31 AM »
Thanks for information.  Just what I was looking for.  So what would be the typical procedure to "slug" the barrel?  I assume you push a slug from the breach slowly increasing the size until you get one that pushes through with a moderate amount of force.  Could one of you elaborate on how to make / buy or otherwise obtain the slugs and about how snug the correct sized slug should be at the muzzle?
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oneshot61

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Re: 300 cal 68 gr. BBT Group Buy bullet performance
« Reply #8 on: August 01, 2017, 04:53:06 AM »
My suggestion would be to push a jsb 44 or 50 through and measure the groove depth that the choke makes. You will need digital micrometer/calipers to measure with. If you don't have any, they can be found on Amazon.

rsterne

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Re: 300 cal 68 gr. BBT Group Buy bullet performance
« Reply #9 on: August 01, 2017, 08:23:52 AM »
I don't think you meant to measure the "groove depth" on the pellets, because then you would be measuring the land diameter of the muzzle (choke).... You would want to measure the outside (maximum) diameter of the skirt (and head) after it passes through the choke, because it is the groove (maximum) diameter of the barrel at the muzzle you want to size the bullets to.... at least that is my understanding.... Note that the head of the pellet may be smaller than the groove diameter of the barrel, so if the head of the pushed through pellet measures smaller than the skirt, you would use the skirt diameter....

Bob
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oneshot61

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Re: 300 cal 68 gr. BBT Group Buy bullet performance
« Reply #10 on: August 01, 2017, 09:26:04 AM »
Yes sir, I stand corrected. What Mr. Bob said is correct. Thank you!

Archshadowman

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Re: 300 cal 68 gr. BBT Group Buy bullet performance
« Reply #11 on: August 01, 2017, 12:24:07 PM »
Never mind, I found some pretty good articles that my good friend Mr. Google recommended.  It looks pretty straight forward.
Thanks
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Bullfrog

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Re: 300 cal 68 gr. BBT Group Buy bullet performance
« Reply #12 on: August 14, 2017, 07:14:22 AM »
I do have good success with them in my .30 Flex. I size them to .300. I've also found that getting the hardness right is also important. Most of my groups give me pellet-like accuracy, with a flier about every 5 shots or so, which I chalk to errors in my casting techique. Which reminds me, I know someone who wants to test some I got to get a batch shipped to...

I'm actually going to build a .30 with a TJ's barrel just for the slugs. I'm tired of constantly resetting my Flex. I have my Flex regged now and I prefer it as a pellet shooter around 74fpe for a good balance between power, shot count, and quietness. I get best results with the bullets shooting them at 110fpe and filling the gun to 3600psi. I've got a Conthran power valve but never could get a TP to work for it and never could get one from Don. I'm going to try to build this new .30 around it.
« Last Edit: August 14, 2017, 07:16:56 AM by Bullfrog »