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Long Range Hunting & Shooting
New stw or go to 7mm rum
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<blockquote data-quote="IdahoCTD" data-source="post: 1129657" data-attributes="member: 13110"><p>I would go with the caliber I could get enough brass to wear the barrel out and then some. A 7-300wm really isn't far behind a 7STW and 300wm brass is much easier to find. I'm sure you have some components since you already have a 7STW but do you have enough for another barrel? I shoot 162 Amax's 3240fps through my 27" Schneider barreled 7-300wm and a little faster than that through my 28" barreled gun (3265fps). I have 2 STW's also and have shot the caliber since the early 90's but rarely shoot them now because the brass is getting so much harder to find and I gain almost nothing over a 7-300wm. The STW and RUM really need long mag boxes to get the most out of them where as my 7-300wm's with 162's runs just barely over 3.6" so they work in a standard length Remington mag box (3.68") without alterations. </p><p></p><p>I would skip the RUM unless you were going to shoot heavy bullets like the 195 Berger. There are some pretty serious diminishing returns going past a 7-300wm or STW. I have a 7-338 Norma Imp reamer on order now but it is throated specifically for the 195's and I have enough brass to last me for probably 20 barrels. I also have a customer that I'm going to build a 7-338 Lapua Imp for to shoot 195's also. I expect 3150-3200fps out of mine and his should go 3300+fps with 195's. If you consider a 7-300wm will shoot 180's 3150fps out of a 28" barrel using roughly 75-78grs of powder and it will take 15+grs more powder to drive the 195 about the same velocity out of a RUM or 7-338 Norma Imp then that tells you they aren't very efficient. That is only about 10fps per grain of powder and even less with the 7-338 Lapua Imp.</p></blockquote><p></p>
[QUOTE="IdahoCTD, post: 1129657, member: 13110"] I would go with the caliber I could get enough brass to wear the barrel out and then some. A 7-300wm really isn't far behind a 7STW and 300wm brass is much easier to find. I'm sure you have some components since you already have a 7STW but do you have enough for another barrel? I shoot 162 Amax's 3240fps through my 27" Schneider barreled 7-300wm and a little faster than that through my 28" barreled gun (3265fps). I have 2 STW's also and have shot the caliber since the early 90's but rarely shoot them now because the brass is getting so much harder to find and I gain almost nothing over a 7-300wm. The STW and RUM really need long mag boxes to get the most out of them where as my 7-300wm's with 162's runs just barely over 3.6" so they work in a standard length Remington mag box (3.68") without alterations. I would skip the RUM unless you were going to shoot heavy bullets like the 195 Berger. There are some pretty serious diminishing returns going past a 7-300wm or STW. I have a 7-338 Norma Imp reamer on order now but it is throated specifically for the 195's and I have enough brass to last me for probably 20 barrels. I also have a customer that I'm going to build a 7-338 Lapua Imp for to shoot 195's also. I expect 3150-3200fps out of mine and his should go 3300+fps with 195's. If you consider a 7-300wm will shoot 180's 3150fps out of a 28" barrel using roughly 75-78grs of powder and it will take 15+grs more powder to drive the 195 about the same velocity out of a RUM or 7-338 Norma Imp then that tells you they aren't very efficient. That is only about 10fps per grain of powder and even less with the 7-338 Lapua Imp. [/QUOTE]
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