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375 barrel twist

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Unread 12-07-2012, 02:53 AM
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Join Date: May 2004
Location: Alaska
Posts: 994
375 barrel twist

Lets say I have a .375" 300 gr Accubond leaving the muzzle at 2800-2900 fps and is my do all bullet of choice,
BUT .... I plan on shooting the 350 gr SMK, TSX and other heavy/ier, longer bullets as they come into my possesion....

the question is ?? what would be the proper twist rate that will work for 300 grain and up at the velocities mentioned above ? 10 twist ? 12 twist ?

I like cut rifled barrels, but most require 1/2 a year wait or are not taking orders, out of the button rifled barrel makers , who makes the better .375 bbls ?

I don't intend to use bullets lighter than 300 grains..

my wildcat dimensions have been finalized and the reamer ordered, need to get a barrel order in soon,
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Unread 12-07-2012, 07:47 PM
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Join Date: Sep 2001
Location: North, Texas
Posts: 613
Re: 375 barrel twist

Not sure what wildcat you are doing but I'm working on a 375wsm and all the info I got was with a 1/10 twist using a 300 grain bullet. I'm going with a Pac-Nor polygonal 10" twist finishing out at 26"
Courage,Spirit and Honor
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Unread 12-08-2012, 05:36 AM
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Join Date: May 2004
Location: Alaska
Posts: 994
Re: 375 barrel twist

I apologize for the questions, just curious and need info....
Reason for the choice of polygonal over Pac-Nor's button 6 groove ? velocity ?

Any idea as to how much velocity increase the polygonal rifled bbl will provide over a cut 5R or button 5C ?

Bartlein & Krieger is too long of a wait, Rock Creek not taking orders, Brux only do 12 twist, no experience with Satern cut bbls.

I was thinking a Broughton but 12 twist only and they don't do 5C in .375,.. Hart 12 twist only
McGowan ????? Spencer ???? Schneider ???? no experience with them !
might have to resort to a Lilja or Pac-Nor !!

Did some reading on the polygonal and I admit it has me interested, anybody here with any experience with Pac-Nor's polygonal rifling ?

texas :
my wildcat is off the 338 Norma Mag..
.342" neck and 35 degree shoulder
ballistically equivalent to the 375 RUM
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Unread 12-08-2012, 08:08 AM
Join Date: Mar 2010
Location: on the Southern Plains
Posts: 1,988
Re: 375 barrel twist

There's a thread in Gubsmithing, "SHORT lead time for Benchmark Barrels" by 'deadlift'. He says "3-4 weeks". Benchmark has been making excellent RF barrels for years, I'd expect nothing less from their CF barrels.
"Shoots real good!": definition; it didn't blow-up in my face. 1993 graduate Montgomery Community College 2yr. gunsmithing program
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Unread 12-08-2012, 10:42 AM
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Join Date: Aug 2008
Location: washington utah
Posts: 230
Re: 375 barrel twist

My 375 rum improved (tejas) has a 1-10" twist hart barrel and shoots the 260 grain accu bond, 300 grain sierra game king and the 350 grain match king all very well.
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Unread 12-08-2012, 04:58 PM
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Join Date: May 2004
Location: Alaska
Posts: 994
Re: 375 barrel twist

338 Bruce:

I have a Hart in my 300 Tomahawk and it is very accurate...

was your 10 twist .375 bbl a special run ?
looking at the Hart website they only list 12 twist in .375

final Q... Is the Pac-Nor polygonal hammer forged ?
the info I get seems thats the way polygonal rifled bbls are made
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Unread 12-08-2012, 06:53 PM
Platinum Member
Join Date: May 2012
Posts: 4,265
Re: 375 barrel twist

standard twist in 37 cal. is 1-12". If sierra wants a faster than standard twist they usually list it, so it should be good to the 350 matchking if you can get over 2400 fps or so with it . they don't list a twist requirement....

Bullet NameDiameter inchesWeight grainsSectional DensityBallistic Coefficients.375 dia. 350 gr. HP MatchKing
.375 350 .355 .805 @ 2,200 fps and above
.780 between 1,700 and 2,200 fps
.720 @ 1,700 fps and below
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