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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm X .338 Lapua?
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<blockquote data-quote="IdahoCTD" data-source="post: 1140550" data-attributes="member: 13110"><p>I know the 7RUM and 7-338 Lapua are off. Going off memory a Edge is 115-116grs and a 338 Lapua is 113-114. Necking them both down won't change that relationship. I think my 30-338 Lapua Imp is more like 123-124grs but I won't be home until tomorrow to confirm that. Also wasn't the capacity of the 28 Nosler measured at 102-103grs in the thread about it? I would bet the 7-8x68 Imp is off too. A 6.5x68S is only 86grs (I've measure it in RWS brass because I intend to make a 6.5x68 Imp and have the brass for it). Necking it up adds about 1 grain and even though it's got a 14.5 degree shoulder and a bunch of taper your not going to gain 12grs of capacity improving it. A 7STW is .200" longer and only .010" skinnier with a pretty modern case design and thinner brass. You have to have a much fatter case like a 28 Nosler to make up for the .200+" case length difference. </p><p></p><p>I do know that my 30-338 Lapua Imp with a 33" barrel shoots 230's at 3350fps and my 30-338 Norma Imp with a 30" barrel is tapped out just over 3100fps. I do have a 30-378 Imp. with a 30" barrel and it will shoot 150's over 4000fps. I'm not home so I don't have the data for the 210's but it seems like it was 3400+fps with 210's. It has a significant increase in capacity over a standard 30-378 though. I've loaded nearly 130grs of WC872 with 150's.</p><p></p><p>Anymore I build calibers based on good brass too. If there isn't really good brass available it's not worth the effort to me. I like improved cases to limit the amount I have to trim brass and minimize case stretch which can result in case head separation. In the case of my 7-338 Norma Imp, it's nice having about 7RUM capacity with a 2.5" long case instead of a 2.85". That allows it to work through magazines much easier. With 423 Dakota brass it's just as good as 338 Lapua brass so you don't need the additional .220" of case length to get roughly the same capacity you would with a standard 7-338 Lapua. Good RWS brass and the lack of a belt is the reason I'll do the 6.5x68 Imp too.</p></blockquote><p></p>
[QUOTE="IdahoCTD, post: 1140550, member: 13110"] I know the 7RUM and 7-338 Lapua are off. Going off memory a Edge is 115-116grs and a 338 Lapua is 113-114. Necking them both down won't change that relationship. I think my 30-338 Lapua Imp is more like 123-124grs but I won't be home until tomorrow to confirm that. Also wasn't the capacity of the 28 Nosler measured at 102-103grs in the thread about it? I would bet the 7-8x68 Imp is off too. A 6.5x68S is only 86grs (I've measure it in RWS brass because I intend to make a 6.5x68 Imp and have the brass for it). Necking it up adds about 1 grain and even though it's got a 14.5 degree shoulder and a bunch of taper your not going to gain 12grs of capacity improving it. A 7STW is .200" longer and only .010" skinnier with a pretty modern case design and thinner brass. You have to have a much fatter case like a 28 Nosler to make up for the .200+" case length difference. I do know that my 30-338 Lapua Imp with a 33" barrel shoots 230's at 3350fps and my 30-338 Norma Imp with a 30" barrel is tapped out just over 3100fps. I do have a 30-378 Imp. with a 30" barrel and it will shoot 150's over 4000fps. I'm not home so I don't have the data for the 210's but it seems like it was 3400+fps with 210's. It has a significant increase in capacity over a standard 30-378 though. I've loaded nearly 130grs of WC872 with 150's. Anymore I build calibers based on good brass too. If there isn't really good brass available it's not worth the effort to me. I like improved cases to limit the amount I have to trim brass and minimize case stretch which can result in case head separation. In the case of my 7-338 Norma Imp, it's nice having about 7RUM capacity with a 2.5" long case instead of a 2.85". That allows it to work through magazines much easier. With 423 Dakota brass it's just as good as 338 Lapua brass so you don't need the additional .220" of case length to get roughly the same capacity you would with a standard 7-338 Lapua. Good RWS brass and the lack of a belt is the reason I'll do the 6.5x68 Imp too. [/QUOTE]
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7mm X .338 Lapua?
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