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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm re-chamber question...
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<blockquote data-quote="AZShooter" data-source="post: 350090" data-attributes="member: 5219"><p>How much over 3000 fps do you need with a 180? I put together a 30" 7 rem mag last year and it shoots the 180 VLD at 3050 @ 60 degrees with 68 gr of RL-25. Recoil is very mild and I know barrel life will be good. </p><p></p><p>Just a few weeks ago I picked up a used LSS model 700 in 7 RUM. It had a 26" barrel. For the heck of it I tried the 180 Berger VLDs. (The bullets were moly coated) Maxed out with 89 gr for a velocity of 3100 fps. A 28" barrel would give you more velocity but how much I can not say. It will also give you far more recoil. </p><p></p><p>Another consideration is magazine fit. The 7 RUM with a 180 VLD is one long cartridge. I had a wyatts box mag added to the LSS 7 RUM and still had a .140" jump to the rifling. This rifle shot well with that jump but another might not. The 7 Rem mag has extra room at the end of the mag box and currently the bullet is .035" INTO the rifling. I have lots of room to chase the throat at the barrel wears. </p><p></p><p>I am certain a few will add to this thread on velocities obtained with the 7 RUM. </p><p></p><p></p><p>Here is one comparison. 180 Berger VLD: G7 BC is .337 Using JBM's program: 4000 ft, 65 degrees:</p><p></p><p>I am guessing what a 28" 7 rem mag would do 2950 fps</p><p>7 RUM ??? ------------------------------------------------------- 3200 fps</p><p></p><p>Both rifles zeroed at 200 yds</p><p></p><p>7 rem mag: </p><p></p><p>100 yd 1.4 high</p><p>300 yd -6"</p><p>500 yd -33.3 </p><p>drift in a 90 degree 10 mph crosswind 8.8"</p><p>energy at 500 yd 2391 ft/lb</p><p></p><p>7 RUM:</p><p></p><p>100 yd 1" high</p><p>300 yd -4.9"</p><p>500 yd -27.7"</p><p>drift in 90 degree 10 mph crosswind 7.8"</p><p>energy at 500 yd 2859 ft/lb</p><p></p><p></p><p>Hope this helps.</p></blockquote><p></p>
[QUOTE="AZShooter, post: 350090, member: 5219"] How much over 3000 fps do you need with a 180? I put together a 30" 7 rem mag last year and it shoots the 180 VLD at 3050 @ 60 degrees with 68 gr of RL-25. Recoil is very mild and I know barrel life will be good. Just a few weeks ago I picked up a used LSS model 700 in 7 RUM. It had a 26" barrel. For the heck of it I tried the 180 Berger VLDs. (The bullets were moly coated) Maxed out with 89 gr for a velocity of 3100 fps. A 28" barrel would give you more velocity but how much I can not say. It will also give you far more recoil. Another consideration is magazine fit. The 7 RUM with a 180 VLD is one long cartridge. I had a wyatts box mag added to the LSS 7 RUM and still had a .140" jump to the rifling. This rifle shot well with that jump but another might not. The 7 Rem mag has extra room at the end of the mag box and currently the bullet is .035" INTO the rifling. I have lots of room to chase the throat at the barrel wears. I am certain a few will add to this thread on velocities obtained with the 7 RUM. Here is one comparison. 180 Berger VLD: G7 BC is .337 Using JBM's program: 4000 ft, 65 degrees: I am guessing what a 28" 7 rem mag would do 2950 fps 7 RUM ??? ------------------------------------------------------- 3200 fps Both rifles zeroed at 200 yds 7 rem mag: 100 yd 1.4 high 300 yd -6" 500 yd -33.3 drift in a 90 degree 10 mph crosswind 8.8" energy at 500 yd 2391 ft/lb 7 RUM: 100 yd 1" high 300 yd -4.9" 500 yd -27.7" drift in 90 degree 10 mph crosswind 7.8" energy at 500 yd 2859 ft/lb Hope this helps. [/QUOTE]
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7mm re-chamber question...
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