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The Basics, Starting Out
Long Range Rifle
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<blockquote data-quote="MontanaRifleman" data-source="post: 287992" data-attributes="member: 11717"><p>Good discussion so why not add my $.03 <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p> </p><p>I own a couple of 7mm RM's and it's a good cartridge. I think I'll have to stand somewhere between JE and Grit.</p><p> </p><p>The max effective range of a cartridge depends on a lot of things, not the least of which is personal preferences. I consdier the minimum opening velocity as my first limit and with most deer size crittters that velocity in say a 140 bullet and bigger will provide adequate penetration to the job fairly well. For larger elk size game I like to see at least 40 lbft of momentum for adequate penetration and exit of the boiler room and I would be choosy about my shot. I look at momentum instead of enrgy because I think it's a more accurate indicator of penetration. I do think the 1500 ftlb of energy is more than adequte to kill an elk and a very safe limit.</p><p> </p><p>So where does that leave me with the 7mm RM and a 160 gr NAB with an MV fo 3000 fps? At 3000 ft of elev, where a lot of elk are found (or higher) the 160 NAB will get to 800 yds with a little over 1800 fps (the minimum opening velocity of most hunting bullets we use) and 41 lbft of momentum. This would be my personal limit on both deer and elk for this combination. Now I believe Hornadys open at lower velocites, so if using a Hornady I could maybe strectch the distance a 100-200 yds farther. Could I kill an elk or deer without bullet expansion? Yes, but it isn't something I would plan to do.</p><p> </p><p>OK now... shooting griz @ 660 yds with a 7mm... not something I would do. Although it could probably done fairly effectively, I want a little more assurance of a good, damaging hit to make a shot on a critter like a griz. Would really hate to shoot one of those and have it get away.</p><p> </p><p>Enjoy your Sako and welcome to LR hunting,</p><p> </p><p>-MR</p></blockquote><p></p>
[QUOTE="MontanaRifleman, post: 287992, member: 11717"] Good discussion so why not add my $.03 :) I own a couple of 7mm RM's and it's a good cartridge. I think I'll have to stand somewhere between JE and Grit. The max effective range of a cartridge depends on a lot of things, not the least of which is personal preferences. I consdier the minimum opening velocity as my first limit and with most deer size crittters that velocity in say a 140 bullet and bigger will provide adequate penetration to the job fairly well. For larger elk size game I like to see at least 40 lbft of momentum for adequate penetration and exit of the boiler room and I would be choosy about my shot. I look at momentum instead of enrgy because I think it's a more accurate indicator of penetration. I do think the 1500 ftlb of energy is more than adequte to kill an elk and a very safe limit. So where does that leave me with the 7mm RM and a 160 gr NAB with an MV fo 3000 fps? At 3000 ft of elev, where a lot of elk are found (or higher) the 160 NAB will get to 800 yds with a little over 1800 fps (the minimum opening velocity of most hunting bullets we use) and 41 lbft of momentum. This would be my personal limit on both deer and elk for this combination. Now I believe Hornadys open at lower velocites, so if using a Hornady I could maybe strectch the distance a 100-200 yds farther. Could I kill an elk or deer without bullet expansion? Yes, but it isn't something I would plan to do. OK now... shooting griz @ 660 yds with a 7mm... not something I would do. Although it could probably done fairly effectively, I want a little more assurance of a good, damaging hit to make a shot on a critter like a griz. Would really hate to shoot one of those and have it get away. Enjoy your Sako and welcome to LR hunting, -MR [/QUOTE]
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