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MONTANA
RIFLEMAN BARRELS TECHNICAL INFORMATION
The Montana Rifleman only makes one grade
of barrels. This is Premium Grade. All of our barrels are
completely hand-lapped to assure that you only receive the
best quality.
Look at the bottom of this page for our
barrel break in procedures (procedures are in pdf format)
Contour |
# |
A |
B |
C |
D |
E |
Maximum
Length |
Estimated
Weight |
Max
Bore Size |
U/L Sporter |
1 |
1.180 |
2.25 |
2.5 |
.800 |
.570 |
22" |
2.5 |
.300 |
L/W Sporter |
2 |
1.200 |
2.5 |
2.5 |
.840 |
.600 |
24" |
3 |
.330 |
| Reg. Sporter |
3 |
1.200 |
2.5 |
2.5 |
.860 |
.625 |
26" |
3.25 |
.350 |
Med. Sporter |
4 |
1.200 |
2.625 |
2.5 |
.880 |
.650 |
28" |
4 |
.375 |
Hvy Sporter |
5 |
1.200 |
2.75 |
2.5 |
.935 |
.700 |
28" |
5 |
.416 |
#1 Heavy Sporter |
#1 |
1.200 |
3 |
2.5 |
. |
.985 |
26" |
6 |
. |
#2 Heavy Sporter |
#2 |
1.200 |
3.25 |
2.5 |
. |
1.035 |
26" |
7 |
. |
Contour |
# |
A |
B |
C |
D |
Maximum
Length |
Estimated
Weight |
Light Target |
6 |
1.200 |
3 |
21-23 |
.750 |
32" |
6 |
Medium Target |
7 |
1.200 |
3.125 |
21-23 |
.875 |
32" |
7 |
Heavy Target |
8 |
1.200 |
3.25 |
21-23 |
1.00 |
32" |
8 |
All dimensions are "approximate".
We do not guarantee these dimensions and reserve the right
to change them at any time.
Octagon Contours
Please note that their are no
"standard" dimensions in a octagon barrel. If
you desire specific dimensions please use these drawings.
Bores, Grooves, Twists &
Cartridges We Chamber For
Please note on
the chambers below that these are all SAAMI
standard chambers. If you want a chamber other than
SAAMI standard you will
need to provide all reamers and gauges necessary to complete
the job safely. This also includes special throating specifications.
(SAAMI = Sporting Arms and Ammunition
Manufacturers Institute)
CALIBER |
BORE/GROOVE |
TWISTS AVAILABLE |
17 |
.168/.172 |
7 1/2, 9, 10 |
19 |
.193/.198 |
12 |
204 |
.199/.204 |
9, 11, 12 |
22 Rim Fire |
.218/.222 |
9, 16 |
22 Center Fire |
.219/.224 |
7, 8, 9, 10, 12, 14 |
6mm/243 |
.237/.243 |
8, 9, 10, 12 |
25 |
.250/.257 |
10 |
6.5 |
.256/.264 |
7 1/2, 8 1/2, 9, 10 |
270 |
.270/.277 |
10, 11 |
7mm |
.277/.284 |
8, 9 1/2, 10 |
30 |
.300/.308 |
10, 12 |
302 |
.302/.310 |
10 |
303 |
.303/.311 |
10 |
8mm |
.315/.323 |
10 |
338 |
.330/.338 |
10, 11 1/2, 12 |
9mm |
.347/.355 |
10 |
357 Pistol |
.350/.357 |
18 |
35 |
.350/.358 |
12 |
9.3 |
.358/.366 |
14 |
375/38-55 |
.368/.376 |
12, 18 |
38-40 |
.395/.405 |
20 |
40 |
.400/.408 |
13, 20 |
41 |
.402/.409 |
18 |
416 |
.408/.416 |
14 |
404/425 |
.416/.424 |
|
44 |
.422/.429 |
16, 24 |
45 Pistol |
.442/.450 |
20 |
| 45 |
.450/.458 |
14, 16, 18, 22 |
475 |
.467/.475 |
10, 20 |
50 AE |
.492/.500 |
18 |
505 |
.495/.505 |
16 |
50 |
.500/.510 |
15, 16, 20, 28 |
If you are interested
in a bore/groove and twist that is "not" listed
above please contact us with your requirements. Tooling
costs are estimated at $500 and take approximately 3 months
to order and receive.
Just Added! You can now order our barrels
& actions online. To place an order for a barrel or
action click here Barrel
& Action Order
Barrel
Break-In Procedures
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