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Velocity Comparison of 20" & 27" Barrels

Posted: Thu 22 Apr, 2010 11:06 am
by Barrett1
This is for all you tech junkies out there!

*edit*
Thanks to everyone who caught the coefficient error in the chart. Drag function wasn't quite right either, but the techs jumped right on it. This update was made on 4 June 2010.

Re: Velocity Comparison of 20" & 27" Barrels

Posted: Fri 23 Apr, 2010 9:05 pm
by leftcoast32
Great Information!!!

Re: Velocity Comparison of 20" & 27" Barrels

Posted: Wed 02 Jun, 2010 4:42 am
by freddy979
Interesting. I thought there would be a more dramatic difference in velocity.

*edited by Kevin Fry* The same question was asked in another thread and I responded there.

Re: Velocity Comparison of 20" & 27" Barrels

Posted: Fri 04 Jun, 2010 1:38 am
by Kiwi Greg
I was wondering which 300 grain bullet was used for this data, because it seems awfully slow, not even supersonic at 1000 ?
Jbm with the same atmospherics is way quicker with the 300 SMK ?

Re: Velocity Comparison of 20" & 27" Barrels

Posted: Fri 04 Jun, 2010 7:02 am
by flyjets
Kevin

I was looking over your numbers for the 300Gr 27" 338 Lapua Magnum.

My experience doesn't agree with your posted data and when Exbal is used your data seems off as well.

Think about it a 338 Lapua according to your data is starting to go subsonic at 975 yards ? Impacts at 1000 yards with only 805 lbs of energy ?

Ballistic coefficient of 224 seems incorrect.

Ian

Re: Velocity Comparison of 20" & 27" Barrels

Posted: Fri 04 Jun, 2010 9:30 am
by Barrett1
Sure, blame the guy that posts the data! :lol: Thank you all for catching the error. The techs have provided the correct chart this time and it's now updated in the original post up top.

Re: Velocity Comparison of 20" & 27" Barrels

Posted: Fri 04 Jun, 2010 4:37 pm
by Shadow
Kevin Fry wrote:Sure, blame the guy that posts the data! :lol: Thank you all for catching the error. The techs have provided the correct chart this time and it's now updated in the original post up top.


Yeah.... blame it on "the techs". :owned:

I didn't look at the charts until the errors surfaced - so I missed all the drama.... :whip:

Maybe youse guys need to get those techs out more - to shoot the 98Bs??
:cheer:

Re: Velocity Comparison of 20" & 27" Barrels

Posted: Mon 07 Jun, 2010 9:02 am
by Barrett1
It was only a typo, no biggie, no drama. Just glad someone caught it.

Re: Velocity Comparison of 20" & 27" Barrels

Posted: Sun 20 Jun, 2010 10:16 pm
by caporider
As an additional data point, my 20" 98B throws the Hornady 250gr BTHPs at 2615fps.

Re: Velocity Comparison of 20" & 27" Barrels

Posted: Tue 15 Mar, 2011 8:32 am
by Barrett1
Thanks for your interest, but we've only got data on 20" & 27" barrels. This looks like a job for the community!

Re: Velocity Comparison of 20" & 27" Barrels

Posted: Sat 11 Oct, 2014 6:30 pm
by Ptkcombatives
Hi there , Is there any reason why I cant see the tables ? The Tables are there but just black inside with no data ?

cheers