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Barrel Contour Data

Types of Contours: Contoured Barrels | Straight Tapers l Palma Contours l Rimfire Contours l Octagon

Special Straight Tapers l Factory Contours l 15" Long XP-100 Type l AR-Type Barrels

For our special contour policy - Click Here

Contoured Barrels:

Contoured Barrel

Contoured

Barrel Number

A B C D E F Approx. Weight at "F" Length in .30 caliber Weight per inch at "C" Diameter in .30 caliber
1 1.200" .700" .525" 2.50" 6" 27.0" 2.70 lbs. .040 lbs.
2 1.200" .750" .575" 2.50" 6" 27.0" 3.00 .052
3 1.200" .800" .625" 2.75" 6" 27.0" 3.37 .065
4 1.200" .825" .650" 2.75" 6" 27.0" 3.59 .072
5 1.250" .875" .700" 3.00" 6" 27.0" 4.00 .087
6 1.250" .925" .750" 3.25" 6.5" 27.0" 4.46 .103
7 1.250" 1.000" .825" 3.50" 6.5" 27.0" 5.07 .128
8 1.250" 1.075" .900" 3.50" 6.5" 27.0" 5.90 .156

The above contours listed are our standard contours. Our standard length contoured and straight taper barrels listed above are furnished 28" long, with 27" useable. All contoured barrels have a taper of .008" per inch between the B and C diameters shown above, so the muzzle diameter for a shorter barrel would be proportionately larger. The radius of the contoured section is 30", tangent to the barrel at the "B" dimension point. On request we can make barrels of #4 contour or larger up to a 30" finish length (see pricing). The #4 contour can be fluted in .30 caliber and smaller.

XP-100 tpye barrels 15" long, for contour listing - Click Here

Estimating Weights. The weights listed above are for a 27" long barrel in .30 caliber. For estimating the weights of shorter barrels, subtract the figure in the weight-per-inch column from the weight in the 27" length column. For example the weight for a 27" #5 contour is listed above at 4.00 pounds. For a 24" length: 4.00 - (3 x .087) = 3.74 pounds. Keep in mind that these are approximate weights and that calibers other than .30 will weigh more or less. At a 27" length a .224 caliber barrel will weigh .247 pounds more than a .30 caliber barrel. Threading and chambering would typically reduce the weight by about .20 pounds. The weight removed by fluting depends on the caliber, contour and finish length. On a typical #5 contour with a 26" finish length, in .30 caliber fluting would remove about .50 pounds, reducing it to about the weight of a #4 contour. Our normal stopping point for flutes at the muzzle end of the barrel is 1.5" short of the requested finish length.

To download an Excel file that will calculate the weights of our standard contours very accurately at different lengths and calibers - Click Here.

We can also duplicate some factory barrel contours like the Remington contours including the Varmint / Sendaro contours and the Winchester model 70, Weatherby and a few others. There is a $40 extra charge for these special contours if we do not already have a CNC program for that particular contour. For a listing of existing factory contours - Click Here.

Octagon barrels can be milled. Please inquire about your specific dimensions. We work from across-the-flats dimesions. For more information on octagon barrels - Click Here

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Straight Taper Benchrest Barrels:

Straight Taper

Barrel Taper A C D F Approx. Weight at "F" Length
NBRSA HV Taper 1.250" .925" 5.0" 27.0" 6.75 lbs.
1.200 HV Taper 1.200" .875" 5.0" 27.0" 6.25 lbs.
NBRSA Hunter 1.250" .725" 4.0" 27.0" 5.75 lbs.
M24 1.200" .900" 5.0" 27.0" 6.45 lbs.
MTU 1.250" .930" 3.0" 26.0" 6.77 lbs.
Mk13 Mod7 1.250" .800" 4.0" 26.0" 6.13 lbs.
Tactical 1.200" .780" 4.0" 27.0" 5.65 lbs.

The two HV taper barrels above have a taper of .015" per inch. The Tactical taper is a pattern developed by one of our military customers. It has a taper of .018" per inch. The NBRSA Hunter taper is .024" per inch. Our standard length barrels are furnished 28" long and will finish up to 27". On request we can make them up to a 30" finish length (see pricing). All of these straight taper barrels can be fluted. We also have close to 200 special straight tapers we have CNC programs for that we've run in the past. To see the complete list in a .pdf file - Click Here

To download an Excel file that will calculate the weights of straight taper barrels very accurately at different lengths and calibers and with or without fluting Click Here.

Palma Contours: Return to top

Contoured Barrel

Palma Barrel Designation A B C D E F Approx. Weight at "F" Length in .30 caliber
#7 x 28" 1.250" 1.000" .815" 3.5" 6.5" 28.0" 5.25 lbs.
#7 x 30" 1.250" 1.000" .800" 3.5" 6.5" 30.0" 5.50
Palma 28 1.250" .950" .795" 5.0" 8.5" 28.0" 5.25
Palma 30 1.250" .950" .780" 5.0" 8.5" 30.0" 5.48
Palma 30B 1.250" .950" .815" 5.0" 8.5" 30.0" 5.62
Palma 31B 1.250" .950" .810" 5.0" 8.5" 31.0" 5.92
Palma 32 1.250" .950" .760" 5.0" 8.5" 32.0" 5.68
Palma 34 1.250" .950" .745" 5.0" 8.5" 34.0" 5.89
Palma 35A 1.250" .980" .760" 4.5" 7.5" 35.0" 6.09
Palma 35B 1.250" .980" .760" 3.5" 6.5" 35.0" 5.92

The contours listed above are what we refer to as Palma contours. They can be used for any long-range over-the-course type rifles. Specifically for Palma shooting we offer these in a tight .299" bore diameter 13" twist 3-groove rifling configuration. All other calibers and twist combinations available in barrels up to 30". For barrels over 30" caliber and twist combinations available are .264 - 8", 7mm - 9", .30 - 10", .30 - 11", and .30 - 13". The weights listed will vary slightly with caliber - most were .30 caliber when weighed.

The radius of the contoured section is 36", tangent to the barrel at the "B" dimension point and the taper between the B and C diameters is .008" per inch except for Palma 30B.

AR Type Barrels:

We make a variety of profiles for AR type rifles including the AR-15, AR-10 and M-4's. These barrels require threading and chambering, drilling of the gas hole, crowning and installation of the gas block and barrel extension. On large orders we will thread and chamber. To see a complete list of the profiles we are presently turning as a .pdf file - Click Here

This is an image of our AR Wasp contour turned on the AR750 contour and fluted ahead of and behind the gas block. This blank is 24" long and weighs 2.74 pounds as shown.

 

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