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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
300 RUM Barrel Length
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<blockquote data-quote="River Man" data-source="post: 164991" data-attributes="member: 9084"><p>[html] </p><p> </p><p>Hello All,</p><p> </p><p>This is my first post, so be gentle on me.</p><p> </p><p>I have a 300 RUM with a Rem 700 action and a Krieger Light Varmint contour 35 inch barrel. </p><p>It is set up as a tactical rifle with a McMillan A5 stock. (I am in my Tactical Toys phase right now.) </p><p>The gun will be used for target shooting as well as long range hunting. </p><p> </p><p> </p><p>I plan to primarily shoot either 240 SMKs or 210 Berger VLDs pending the</p><p>results of future accuracy tests.</p><p> </p><p> </p><p>I bought the extra long barrel because some wise person posted on long range hunting </p><p>that you can cut a barrel shorter but you can't add length to an existing barrel. </p><p>Currently the barrel is a bit long for carry. </p><p>I want to cut it to either 28, 29, or 30 inches. </p><p>Based on my data below, I am leaning toward the 30 inch barrel. </p><p> </p><p> </p><p>I would appreciate some feedback from the wise people on this forum.</p><p> </p><p>My test results are below. </p><p>Factory velocity's are from Hodgdon's website. Hodgdon data is from 24 inch barrels.</p><p> </p><p>190 gr sierra 35 inch barrel</p><p> Grains Velocity Factory Increase Speed/inch</p><p>US869 104 3240 3035 205 18.63636</p><p> </p><p>Retumbo 96 3200 3204 -4 -0.36364</p><p> </p><p>H50BMG 105 3136 3085 51 4.636364</p><p> </p><p>IMR 7828 86 3209 2985 224 20.36364</p><p> </p><p> </p><p>210 gr berger 35 inch barrel </p><p> Grains Velocity Factory Increase Speed/inch</p><p>US869 101 3126 2897 229 20.81818</p><p> </p><p>Retumbo 92 3063 2977 86 7.818182</p><p> </p><p>H50BMG 101 3061 2900 161 14.63636</p><p> </p><p>IMR 7828 83 3013 2816 197 17.90909</p><p> </p><p> </p><p>240 gr Sierra 35 inch barrel </p><p> Grains Velocity 1 Velocity 2 Velocity 3 </p><p>US869 97 2908 2928 2933 Good</p><p> </p><p>US869 98 2964 2954 2974 Best</p><p> </p><p>US869 99 2923 2997 3024 Max</p><p> </p><p>US869 100 2981 Err 2 3017 </p><p> </p><p>US869 101 2992 3042 3115 </p><p> </p><p> </p><p> </p><p>Estimated velocity change per inch extrapolated from my data </p><p>and corresponded to Lilja 50 BMG data</p><p> </p><p> bbl length + fps 30 inch 29 inch 28 inch </p><p>24-25 31 x x x </p><p>26 29 x x x </p><p>27 27 x x x </p><p>28 25 x x 135 fps </p><p>29 23 x 156 fps</p><p>30 21 175fps </p><p>31 19 </p><p>32 17 </p><p>33 15 </p><p>34 13 </p><p>35 11 </p><p> </p><p> Total 231fps</p><p>[/html]</p></blockquote><p></p>
[QUOTE="River Man, post: 164991, member: 9084"] [html] Hello All, This is my first post, so be gentle on me. I have a 300 RUM with a Rem 700 action and a Krieger Light Varmint contour 35 inch barrel. It is set up as a tactical rifle with a McMillan A5 stock. (I am in my Tactical Toys phase right now.) The gun will be used for target shooting as well as long range hunting. I plan to primarily shoot either 240 SMKs or 210 Berger VLDs pending the results of future accuracy tests. I bought the extra long barrel because some wise person posted on long range hunting that you can cut a barrel shorter but you can't add length to an existing barrel. Currently the barrel is a bit long for carry. I want to cut it to either 28, 29, or 30 inches. Based on my data below, I am leaning toward the 30 inch barrel. I would appreciate some feedback from the wise people on this forum. My test results are below. Factory velocity’s are from Hodgdon’s website. Hodgdon data is from 24 inch barrels. 190 gr sierra 35 inch barrel Grains Velocity Factory Increase Speed/inch US869 104 3240 3035 205 18.63636 Retumbo 96 3200 3204 -4 -0.36364 H50BMG 105 3136 3085 51 4.636364 IMR 7828 86 3209 2985 224 20.36364 210 gr berger 35 inch barrel Grains Velocity Factory Increase Speed/inch US869 101 3126 2897 229 20.81818 Retumbo 92 3063 2977 86 7.818182 H50BMG 101 3061 2900 161 14.63636 IMR 7828 83 3013 2816 197 17.90909 240 gr Sierra 35 inch barrel Grains Velocity 1 Velocity 2 Velocity 3 US869 97 2908 2928 2933 Good US869 98 2964 2954 2974 Best US869 99 2923 2997 3024 Max US869 100 2981 Err 2 3017 US869 101 2992 3042 3115 Estimated velocity change per inch extrapolated from my data and corresponded to Lilja 50 BMG data bbl length + fps 30 inch 29 inch 28 inch 24-25 31 x x x 26 29 x x x 27 27 x x x 28 25 x x 135 fps 29 23 x 156 fps 30 21 175fps 31 19 32 17 33 15 34 13 35 11 Total 231fps [/html] [/QUOTE]
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300 RUM Barrel Length
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