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J.Dubell - 2009

Available Bore Dimensions

nominal  nominal standard  optional
Tool # bore dia. groove dia. typical chamberings groove count groove count
1 .217 .222 22 Rimfire (non magnum)    
2 .219 .224 221 Fireball, 223 Remington,  220 Swift 4 7
3 .237 .243 6mm BR, 243 Winchester, 6mm Remington 6 4
4 .250 .257 25-35 WCF, 250 Savage, 25-06 Remington 6  
5 .256 .264 260 Remington, 6.5-284 Norma, 264 Winchester Magnum 6  
6 .270 .277 270 Winchester, 270 WSM 6  
7 .277 .284 7x57mm Mauser, 280 Remington, 7mm STW 6  
8 .295 .300 300 Rook 6  
9 .300 .308 30-30 WCF, 308 Winchester, 30-06 Springfield, 300 WSM 6 4
10 .303 .311-.314 303 British, 7.62x39mm, 32 H&R, 327 Federal 6  
11 .305 .318 8x57mm J 6  
12 .315 .320-.323 8x57mmJS, 8mm Remington Magnum, 32 Winchester Special, 32-40 6  
13 .330 .338 338 Federal, 338-06 A-Square, 338 Winchester Magnum 6  
14 .340 .348 348 WCF 6  
15 .345 .354-.356 9x57mm Mauser, 9mm pistols, 38/357 revolvers 6  
16 .350 .358 35 Remington, 358 Winchester, 35 Whelen, 358 STA 6  
17 .358 .366 9.3x57mm Mauser, 9.3x62mm Mauser, 9.3x74R 6  
18 .366 .375 375 Winchester, 375 H&H Magnum, 375 Ruger 6  
19 .373 .379 38-55 Winchester 6  
20 .390 .400 10mm Auto, 40 S&W 6  
21 .394 .400 38-40 WCF 6  
22 .400 .408-.411 40-65 Winchester, 400 Whelen, 400 H&H Magnum 6  
23 .405 .412 405 Winchester 6  
24 .408 .416 416 Taylor, 416 Remington Magnum, 416 Rigby, 416 Ruger 6  
25 .417 .429-.430 44 Remington Magnum, 444 Marlin 6  
26 .422 .427-.428 44-40 WCF 6  
27 .438 .446 44-77 Sharps 6  
28 .442 .451 45 ACP, 45 Colt, 454 Cassull 6  
29 .450 .458 45-70 Gov't, 458 Winchester Magnum, 458 Lott, 458 SOCOM 6  
30 .466 .475 .470 Nitro Express, 475 Turnbull, 475 Linebaugh 6  
31 .475 .483 or .488 475 #2 Nitro Express 3  1/2”  (Ely or Jeffery) 6  
32 .488 .498-.500 50 Action Express, 500 S&W 6  
33 .495 .505 505 Gibbs Magnum 6  
34 .500 .510-.513 500 Linebaugh, 50 Alaskan, 50-110 WCF, 50 BMG 6  
35 .575 .585 577 Nitro Express, 577 Snider 8  
36 .604 ..614 or .621 600 Nitro Express 8  
37 .688 .700 700 H&H Nitro Express 8  

As soon as I get my list completed I'll post the selection of chamber reamers we have on hand.

 

 

Gear Generated Twist Rates Available

 

Clearwater Rifling Machine Change Gears
 
gear rifling pitch gear rifling pitch
teeth (actual) (rounded) teeth (actual) (rounded)
30 5.89   77 15.12  
31 6.09 6 78 15.31  
32 6.28   79 15.51  
33 6.48 6.5 80 15.70  
34 6.67   81 15.90 16
35 6.87   82 16.10  
36 7.07 7 83 16.29  
37 7.26   84 16.49  
38 7.46 7.5 85 16.69  
39 7.66 7.7 86 16.88  
40 7.85   87 17.08 17
41 8.05 8 88 17.27  
42 8.24   89 17.47  
43 8.44 8.5 90 17.67  
44 8.64   91 17.86  
45 8.83   92 18.06 18
46 9.03 9 93 18.26  
47 9.23   94 18.45  
48 9.42 9.5 95 18.65  
49 9.62 9.6 96 18.84  
50 9.82   97 19.04 19
51 10.01 10 98 19.24  
52 10.21   99 19.43  
53 10.40 10.5 100 19.63  
54 10.60 10.6 101 19.83  
55 10.80   102 20.02 20
56 10.99 11 103 20.22  
57 11.19   104 20.42  
58 11.39   105 20.61  
59 11.58 11.5 106 20.81  
60 11.78   107 21.00 21
61 11.97 12 108 21.20  
62 12.17   109 21.40  
63 12.37   110 21.59  
64 12.56 12.5 111 21.79  
65 12.76   112 21.99 22
66 12.96 13 113 22.18  
67 13.15   114 22.38  
68 13.35   115 22.57  
69 13.54 13.5 116 22.77  
70 13.74   117 22.97 23
71 13.94 14 118 23.16  
72 14.13   119 23.36  
73 14.33   120 23.56  
74 14.53   121 23.75  
75 14.72   122 23.95 24
76 14.92 15

The twist rates in the highlighted boxes are what we are currently working with. If you decide your project needs one of the others (non-highlighted) we can aquire the drive gear at an additional charge. See notes below about twist rates slower than 1:22

 

 

On our Rifling machine the twist rate is generated by a gear and rack system for twists from one in seven inches to one in twenty-two inches. For slower twist rates we are able to set up a sine-bar attachment and work out to some very slow twist rates. We have cut 1:120 on a couple of projects, and of course we can handle the standard twist rates for black-powder cartridge guns and muzzle loaders as well. There is an additional charge to set up for the slower twist rates as more time is required to install the sine-bar attachment and set it for each project.