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Dennis_in_VA
Reply with quote  #1 
I was wondering if anybody here could tell me if there is a round that can push a Nosler 120 gr 6.5mm Ballistic Tip around 4000 fps with a good degree of accuracy and without the bullet self destructing?

I see that Richard Franklin's 300 WSM Varminter will push a Hornady 110 gr VMax @ 4000 - 4100 fps with a slow twist barrel.

Would a 6.5X284 have the potential for pushing the 120 gr Ballistic Tip to 4000 fps using a long, slow twist barrel?

Let's hear what you have to say, I am all ears.

Thanks in advance for your input.
k80skeet
Reply with quote  #2 
I have a 6.5 x284 and the best I seem to get is low 3000. I also Have a 264 Winchester Magnum and with 66.5 of H4831 about 3360fps and it is about 20 more grains of powder than my 6.5X284. So to answer your question no not possible.
2506
Reply with quote  #3 
I am getting 3600 fps from my 264 Win mag with 65.0 grs H-4831 and 70.5 grs Retumbo with 120 BT's but my rifle has a 27 3/4" barrel.
Asscott4
Reply with quote  #4 
Well you could neck down a .300 Ultra mag and I'm sure that you could achieve that velocity with a .264 bullet. But again that would prolly cost a lot and it prolly wouldn't be very accurate with the light bullets. but I would think it would be cool non-the-less!
Dennis_in_VA
Reply with quote  #5 
Well I don't see why a 300WSM can do 4000 with a 110 Vmax and accurate to boot and 6.5-284 with a 120 BT can only get low to mid 3000.

What twist are you guys using.

Richard is using a 1-15 twist on his 300WSM.

So why wouldn't lets say a 1-12 work with the 6.5-284, since it appears the have the same general case capacity, right? Sure beats having to neck 30 cal to 6.5mm?

Or if I wanted to get really jiggy with it, maybe look into one of those Kirby Allen Magnums. He takes a 338 RUM and necks down to 6.5mm. I don't know much about it but he went with the 338RUM instead of the 7mm or 300RUM because of shoulder and feeding issues.

I know which ever route that is taken on the path to what I'm asking about, that one thing is certain. It will be an overbore barrel burner but it will be like a Dragster. Fast, Fun, and lots of Red Mist and Chunks.
malcarjeb
Reply with quote  #6 
I have a 6.5 RUM with a 29" barrel and the best it will do is 3850 with the 120 BT. I have a 264 Win Mag that will do 3900 with a 100 BT. I have never tried the 100s in the 6.5 RUM. The 6.5 bullets will have a lot better BC than the 110 30s.

I have shot several whitetail deer with the 120 BTs in the RUM and it makes a mess!
bohemR13
Reply with quote  #7 
With all else being equal, the larger bore bullet will go faster from a given case.

The reason is the bearing area and the pressure area on the bullet. That 120 6.5 bullet with the same bearing vs. pressure area ratio as a 110 30 bullet would probably be around 90 grains.

This trend is easy to see.

140 in a 260 Rem vs. a 140-150 in a 308
50Vmax in a 223 vs. 50 Vmax in a 6mm-223
180 in a 280 Rem vs. 180 in a 30-06
225 in a 30-06 vs 225 in a 338-06

6Dasher
Reply with quote  #8 
Quote:
Originally Posted by Dennis_in_VA
So why wouldn't lets say a 1-12 work with the 6.5-284, since it appears the have the same general case capacity, right?


Not even close. The 284 holds about 15gr less powder than the WSM.
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