7mm International Rimmed
Historical Notes:
The 7mm International Rimmed was developed as a silhouette cartridge for use in
the Thompson Center single shot pistol. It is based on the 30-30 Winchester case
necked down to 7mm (.284"), then fire formed to create a 38 degree shoulder
angle. It was developed by Elgin Gates in the late 1970s as one of a series of
wildcat silhouette cartridges ranging from 25 to 35 caliber for I.H.M.S.A.
matches. The 7mm International Rimmed cartridge is similar to the commercial
7-30 Waters except for the sharper shoulder and less body taper. Both are made
by necking down the 30-30 Winchester case. The 7mm International Rimmed is
popular among handgun silhouette shooters and is a very effective cartridge for
this sport.
General Comments:
The 7mm (284) caliber has emerged as a popular choice for handgun silhouette
shooting, and a fairly large number of 7mm cartridges have emerged for this
purpose. The 7mm International Rimmed is one of the better ones and also makes a
good field cartridge for anything from varmints up to deer sized game when
loaded with proper bullets at top velocities. It will push the 130 grain bullet
at over 2000 fps muzzle velocity out of a 10 inch barrel, and the same bullet at
around 2200 fps out of the 14 inch barrel. The 7-30 Waters loaded by
Federal can
do as well or better, and it is a commercial cartridge requiring no neck sizing
or other changes. For these reasons it may replace the 7mm International Rimmed
and some of the other rimmed 7mm cartridges as a favorite handgun silhouette
round.
Source: Cartridges of the World
| 7mm International Rimmed Reloading Data | ||||
|---|---|---|---|---|
| Bullet (grs.) | Powder / (grs.) | MV | ME | Source |
| 120 SP | RL-7 / 27.5 | 2085 | 1160 | 12" barrel |
| 130 SP | H-4895 / 31.0 | 2040 | 1200 | 12" barrel |
| 139 SP | H-4895 / 30.0 | 1830 | 1040 | 12" barrel |
| 145 SP | H-322 / 28.0 | 1925 | 1200 | 12" barrel |
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