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7mm Rem Mag Twist Rate
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<blockquote data-quote="sable tireur" data-source="post: 2872215" data-attributes="member: 27307"><p>Before the advent of long for caliber and nonmetallic bullets, factory rifles used the 1:9" for the most part. Here is the short list of factory twist rates:</p><p></p><p><strong><em><em><strong>7mm Remington Magnum - 1 in 9"</strong></em></em></strong><em><em>...HVA; Rem 40-XB, 700 (1969); Magnum Research Mountain Eagle; T/C Rifle</em></em></p><p><em><strong><em><em><strong>7mm Remington Mag. - 1 in 9-1/4"</strong></em></em></strong><em><em>.... Remington 700; Savage 110, 111, 112, 114, 116; Sako; Win 70, 770; Ruger #1, 77 (old); Mossberg; Browning A-Bolt II, BLR 81; Weatherby Mk V</em></em></em></p><p><em><em><strong><em><em><strong>7mm Remington Mag. - 1 in 9-1/2"</strong></em></em></strong><em><em>... Ruger (present); Savage (present)</em></em></em></em></p><p><em><em><em><strong><em><em><strong>7mm Remington Mag. - 1 in 10" </strong></em></em></strong><em><em>....Browning; FN; H&R 300; Interarms Musketeer; Schultz & Larsen; Browning BAR Mk II; Weatherby Vanguard</em></em></em></em></em></p><p></p><p>There are other factors to consider when using short barrels and long, heavy bullets. </p><p></p><p>Magazine length is important so you don't get caught with one that's too short for your desires. Be sure to check your reamer for the dimensions necessary to achieve your loads.</p><p></p><p>I shoot a very specialized cartridge in a longer barrel using the Badlands 160 Super BD2 bullets. My twist rate is 1:8" (because that's what I had in the shop) since I shoot this above 2,000' and in warmer temps. When it dips down a little colder, I lose about 8 BC points which I can calculate. It's a one-of-a-kind bullet and shouldn't be the deciding factor in your choice of twist rates unless you want to shoot this bullet only.</p><p></p><p>Your 1:8.5" is just a tad too slow for some of the majority of the bullets in the weight range you want to use. I suggest the 1:8" from experience.</p><p></p><p>Enjoy the experience!</p><p></p><p><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="sable tireur, post: 2872215, member: 27307"] Before the advent of long for caliber and nonmetallic bullets, factory rifles used the 1:9" for the most part. Here is the short list of factory twist rates: [B][I][I][B]7mm Remington Magnum - 1 in 9"[/B][/I][/I][/B][I][I]...HVA; Rem 40-XB, 700 (1969); Magnum Research Mountain Eagle; T/C Rifle[/I] [B][I][I][B]7mm Remington Mag. - 1 in 9-1/4"[/B][/I][/I][/B][I][I].... Remington 700; Savage 110, 111, 112, 114, 116; Sako; Win 70, 770; Ruger #1, 77 (old); Mossberg; Browning A-Bolt II, BLR 81; Weatherby Mk V[/I] [B][I][I][B]7mm Remington Mag. - 1 in 9-1/2"[/B][/I][/I][/B][I][I]... Ruger (present); Savage (present)[/I] [B][I][I][B]7mm Remington Mag. - 1 in 10" [/B][/I][/I][/B][I][I]....Browning; FN; H&R 300; Interarms Musketeer; Schultz & Larsen; Browning BAR Mk II; Weatherby Vanguard[/I][/I][/I][/I][/I] There are other factors to consider when using short barrels and long, heavy bullets. Magazine length is important so you don't get caught with one that's too short for your desires. Be sure to check your reamer for the dimensions necessary to achieve your loads. I shoot a very specialized cartridge in a longer barrel using the Badlands 160 Super BD2 bullets. My twist rate is 1:8" (because that's what I had in the shop) since I shoot this above 2,000' and in warmer temps. When it dips down a little colder, I lose about 8 BC points which I can calculate. It's a one-of-a-kind bullet and shouldn't be the deciding factor in your choice of twist rates unless you want to shoot this bullet only. Your 1:8.5" is just a tad too slow for some of the majority of the bullets in the weight range you want to use. I suggest the 1:8" from experience. Enjoy the experience! :) [/QUOTE]
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