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Rifles, Reloading, Optics, Equipment
7mm STW
Why 7STW over 7RUM?
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<blockquote data-quote="Black Sheep" data-source="post: 804018" data-attributes="member: 36862"><p>To echo what 7stw said, the cost of the upgrade from STW to RUM isn't worth it. When I was looking into buying a 7, I was going to go with a RUM. More powder, more speed, more manly testosterone!!!!! Then I started to research the rounds. I shoot Barnes, so using their data, here is an example on a 175 gr tsx:</p><p>7mmSTW 71.5g max of RL25 @ 2898fps. 75.0g max H1000 @ 2908fps</p><p>7mmRUM 84.0g max of RL25 @ 2985fps. 84.0g max H1000 @ 2943fps</p><p>Rum uses 17.5% more RL25 for 3% more velocity</p><p>Rum uses 12.0% more H1000 for 1.2% more velocity.</p><p>Even assuming barrel life, and load workup not being any different for either cartridge, the math nerd in me says its just isn't worth it. For fun, here's the 7RM:</p><p>7mmMAG 62.5g max of RL25 @ 2738fps. 64.0g max h1000 @ 2697fps</p><p>STW uses 14.4% more RL25 for 6% more velocity</p><p>STW uses 17.2% more H1000 for 7.8% more velocity</p><p>Better velocity for powder upgrade from 7RM to STW then from STW to RUM.</p></blockquote><p></p>
[QUOTE="Black Sheep, post: 804018, member: 36862"] To echo what 7stw said, the cost of the upgrade from STW to RUM isn't worth it. When I was looking into buying a 7, I was going to go with a RUM. More powder, more speed, more manly testosterone!!!!! Then I started to research the rounds. I shoot Barnes, so using their data, here is an example on a 175 gr tsx: 7mmSTW 71.5g max of RL25 @ 2898fps. 75.0g max H1000 @ 2908fps 7mmRUM 84.0g max of RL25 @ 2985fps. 84.0g max H1000 @ 2943fps Rum uses 17.5% more RL25 for 3% more velocity Rum uses 12.0% more H1000 for 1.2% more velocity. Even assuming barrel life, and load workup not being any different for either cartridge, the math nerd in me says its just isn't worth it. For fun, here's the 7RM: 7mmMAG 62.5g max of RL25 @ 2738fps. 64.0g max h1000 @ 2697fps STW uses 14.4% more RL25 for 6% more velocity STW uses 17.2% more H1000 for 7.8% more velocity Better velocity for powder upgrade from 7RM to STW then from STW to RUM. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
7mm STW
Why 7STW over 7RUM?
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