I don't 'spose anyone on here has the actual email address for Weaver mounts tech help service. I've tried to fill out their online request form but it just keeps asking me for a valid zip code, not so easy when I'm not resident in the USA. Maybe I'm just not getting the hint but I figure if its good enough to sell their mounts & rings all around the world then its good enough to answer questions from customers from all around the world too.
Steve.

just go buy a set of warnes if you like that style of mounting setup, if thats too heavy at least use the warne bases, they have the cross slot all the way across, not just at the ends like weaver does

I likely would if I knew the correct mounts for my application, a BSA modded P14 303, its similar to either a Rem 700 or Win 70 rear receiver bridge profile & I thought if sent Weavers tech help some measurements they'd tell me what I needed in a flash,however... you know the rest of the story. I've posted on the Canadian & Aus/NZ hunting forums hoping for a answer as these things are relatively common in the colonies but to no avail, thus my post on this forum. HELP
Steve.

The help form mentions that Weaver will answer via email…so lets pretend for a few days that you moved to:

City = Hopkinsville
State = Kentucky
Zip = 42240

Plug that in (still using your correct email address) and lets see what happens

If you know the distance between holes, the diameter of the curve it fits on, and the thickness of the mount, then the Weaver # can be found.

There is a chart in MacFarland's book, "Introduction to modern Gunsmithing".



MacFarland's book was written back when drawing were made with ink pens. But his book is very well written and almost timeless, if it weren't for the Weaver mount #s that have been added since.



It is also possible to change the radius on the bottom, make a mount thinner, and move the hole and countersink. So if you want to customize a Weaver mount, putting it in a pair of V blocks and cutting off the bottom with a fly cutter will change the thickness and the radius ala Steve Acker. With end mills the size of the clearance hole and one the size of the countersink, the holes can be made oblong or new holes made. Blank Weaver rails are available for $10 or $20/ foot in anodized Aluminum.



Acker is an engineer by day, and a first class gunsmith author by night. The book is not just technically great, but every photo and every word exudes the very best quality.
http://www.realguns.com/books/review75.htm

WEAVER COMPANY MOUNT BASE SPECIFICATIONS No.ofBaseLengthHoleSpacingDiameterThickness
11 .812 .504 1.290 .147
12 .812 .504 .925 .155
13 .812 .504 .730 .238
14 .812 .504 Tapered for Savage 99 only
15 .812 .504 .946 .195
16 .812 .504 .840 .205
17 .812 .504 .770 .219
18 .812 .504 1.050 .182
19 .812 .504 1.160 .125
20A 1.168 .860 1.360 .127
21 .812 .504 .710 .273
22 .812 .504 .700 .201
24 .812 .504 .900 .271
25 .812 .504 1.125 .248
27 .812 .504 .930 Tapered .161/.185
28 .812 .504 Flat .239
29 .812 .504 Flat .292
30 .812 .504 .845 Tapered .205/.230
31 .812 .504 Octag. .182
32 .812 .504 Octag. .357
35 1.168 .860 1.290 .147
36 1.401 .604 3.900 .272
39 .812 .504 Flat .165
40A 1.840 .860 1.290 .147
42 .812 .504 .730 .298
43 .812 .504 .840 .265
44 .812 .504 .770 .279
45 .812 .504 1.050 .396
46 1.168 .860 1.290 .222
47 1.168 .860 2.692 .368
48 .812 .504 1.290 .395
49A 1.058 Win. 70 in 375 H&H, 300 H&H only .368
50 4.500 .504 Flat-Tapered .200/.232
53 4.983 Win. 88, 100 1.290 .222
54 .812 .504 1.290 .222
55 .812 .504 1.050 .310
57 2.340 .960 1.220 .250
58 4.624 3.275 Flat .283
59 .812 One hole only Notched .366
60 4.500 Browning .22 Auto, H&R "Topper" .361
61 1.168 .860 Flat .360
62 4.430 Rem. 740, 760 1.290 .222
63A 6.125 Marlin 336 Flat .283
63B 5.450 Marlin 336 Flat .370
65 2.000 None Spec. * .322
66 2.650 None Spec. * .322
67 1.650 None Spec. * .332
68 .812 .504 .916 .399
70 5.900 Rem 600 1.290 .275
71 1.168 .748 1.180 .215
72 .812 .504 2.590 .376
74 5.723 Savage 24V 1.125 .275
75 1.168 .860 1.050 .310
76 .812 One hole only 1.050 .310
77 .812 .504 .700 Tapered .248/.267
78 .812 .504 .880 Tapered .171/.198
79 .912 .604 3.900 .272
80 6.125 .500 1.892 .147
81 6.000 H&R 360, 361 .946 Tapered .237/.252
82 6.000 H&R Topper 158C 1.050 .396
83 .812 .504 1.252 .250
84 1.168 .860 1.252 .250
85 1.168 .860 1.124 .275
86 .862 .555 .925 Tapered .366/.396
87 5.000 H&R 700 1.050 .400
88 5.900 Mossberg 500AS 1.500 .496
89 .862 .560 1.062 .347Fr/.301Rr
90 5.000 Marlin 39A .300Fr/.428Rr
91 1.400 .504 .946 .280
92 4.500 Thompson Contender Hand Gun .361
93 4.430 Rem 4/6/7400/7600 1.290 .222
94 .812 .500 1.124 .170
95 1.168 .860 1.124 .170
TO-9 4.750 Ruger 10/22 2.000 Tapered .155/.170
TO-10 5.00 Grooved for most 22's Spec. * .175

Thanks gentlemen, a brilliant response, Guncat have tried the form thing, seemed to work OK, I'll have to wait & see now though having subsequently got the list from imhance, I think I've worked it out to nos 35 & 36 which are Rem 700 mounts so shouldn't be too hard to come by.tnekkcc, thanks for the book recommendations, a couple I will have to track down by the look of it, the link will make one of them easy. Cheers all.
Steve.

call weaver, they are very helpful over the phone.

quote:

Originally posted by delloro:
call weaver, they are very helpful over the phone.

I would but I have a hell of a time working out time zones & besides, its hardly a local call from where I am, & I don't think they'll accept a reverse charge call.
Steve.

Maybe the same information as imhance posted, but easier to read:
Weaver base specs

Bruce

Damn , all that time putting them into columns & then this comes along. Thanks Bruce.
Steve.

Do a search on midways site for enfield scope mounts, it list the common ones meaning rear bridge contoured like rem700, rem30, and win70. The front shoud be #11 I don't know the rear offhand.
-Don