Greetings @JoshB,
For a first load it pays to keep things simple. The Mag in the model 7 is quite short so the lighter flat base projectiles or Ballistic Tips are a good place to start. Recent chronographing in a 19" barrelled 7mm-08 produced 2,710 fps for the 140 grain and 2.570 fps for the 150 grain Remington corelokt projectiles. The loads were 42.5 and 41.5 grains of AR2208 respectively. These loads are close to or at book max so start lower and chronograph to check velocity and pressure. I am also using 41 grains of AR2206H behind the 145 grain Speer Hot Core for 2,800 fps in a 26" barrel which should give a little less than 2,650 fps in your barrel. Once again this is close to book max so start lower etc.
AR2206H and AR2208 data from ADI/Hodgdons checks out pretty well with my chronographed data assuming the projectiles are similar and barrel length is allowed for. Data for AR2209 may be for an older and slower version so starting low and chronographing is essential.
Regard Grandpamac.
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