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Long Range Hunting & Shooting
7RM or 7mm/300 win
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<blockquote data-quote="IdahoCTD" data-source="post: 933949" data-attributes="member: 13110"><p>I didn't say the caliber was junk. I have 2 7STW's myself and numerous other 8mm mag/375 H&H based calibers from 7STW to 458 Lott. I've probably built more 7STW's then you would ever own and have been playing with the caliber for nearly 20 years. It's a good caliber "IF" you give it the magazine space it needs to be a good caliber. Rechambering a 24" 7RM barrel to STW was my dad's idea not mine. Since it doesn't cost him a thing, and I don't mind doing it for him, I did it. It shoots pretty good but is just slow. If this barrel doesn't do well for my dad he will finally do what I've told him to do for years and that is to buy a custom barrel. He get's free gunsmithing so it's pretty hard to beat that deal.</p><p></p><p>You get entirely too defensive about calibers that you have guns for. Just because you like them doesn't mean there isn't a better mouse trap or someone with a varying opinion. Play with a few more calibers to form a more well rounded opinion of things and you will understand what I'm talking about. BTW my first custom rifle was a 7-300wm on a Mark X mauser action with a 24" Douglas barrel that I had built when I was about 20 years old. Between then and now I learned to build my own guns and have chambered over 150 custom barrels for myself plus numerous others for friends and family, many of which were 7 STW's. I've built just about any magnum caliber available along with a few non-magnums. In custom barrels I've had about 8 STW's and have rechambered another dozen or so factory barrels yet the last 2 7mm's I built were 7-300wm because they give up very little, if anything, to a 7STW and function through a factory mag box with room to spare. Both shoot under 3/8" and one shot a .211" group with the 2nd through the 4th rounds down the barrel and a .318" group the 5th through 7th rounds using a different seating depth. A few days later it went 11 for 12 on pigeons and rock chucks with some pretty spectacular kills.</p><p></p><p>The same goes for your .300 Ackley......I've had .30-8mm's (300 Super), .308 Baer's, and .30-358 STA's (300 Jarrett) based on the 2.85" magnum case. The latter two are almost identical to your 300 Ackley but with 35 degree shoulders instead of 40 degree. The one I shoot the most is the 30-8mm because I don't have to fireform brass. Neck down 8mm mag and away you go. The chamber is perfect so I don't have to neck size at all (shoot it, knock the primers out, put new ones in, load it with powder and seat a new bullet. no sizing) and if I have to FL size I use a 8mm mag FL die with the expander removed. Much easier and cheaper than custom dies. The only nice thing about the 35 and 40 degree shoulders is you don't hardly have to trim your brass and the cases are less likely to separate ahead of the belt with multiple firings. I just had a case separate and stick in the chamber of my 30-8mm I took chuck hunting last week. It did log a most spectacular kill with a 150 Nosler BT doing 3550fps before that though. Parts were hanging in the sage brush behind where he was laying. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /></p><p></p><p>I'm only at 2700' elevation so your speeds and mine won't be that much different. Generally I hunt at 6000' plus though.</p></blockquote><p></p>
[QUOTE="IdahoCTD, post: 933949, member: 13110"] I didn't say the caliber was junk. I have 2 7STW's myself and numerous other 8mm mag/375 H&H based calibers from 7STW to 458 Lott. I've probably built more 7STW's then you would ever own and have been playing with the caliber for nearly 20 years. It's a good caliber "IF" you give it the magazine space it needs to be a good caliber. Rechambering a 24" 7RM barrel to STW was my dad's idea not mine. Since it doesn't cost him a thing, and I don't mind doing it for him, I did it. It shoots pretty good but is just slow. If this barrel doesn't do well for my dad he will finally do what I've told him to do for years and that is to buy a custom barrel. He get's free gunsmithing so it's pretty hard to beat that deal. You get entirely too defensive about calibers that you have guns for. Just because you like them doesn't mean there isn't a better mouse trap or someone with a varying opinion. Play with a few more calibers to form a more well rounded opinion of things and you will understand what I'm talking about. BTW my first custom rifle was a 7-300wm on a Mark X mauser action with a 24" Douglas barrel that I had built when I was about 20 years old. Between then and now I learned to build my own guns and have chambered over 150 custom barrels for myself plus numerous others for friends and family, many of which were 7 STW's. I've built just about any magnum caliber available along with a few non-magnums. In custom barrels I've had about 8 STW's and have rechambered another dozen or so factory barrels yet the last 2 7mm's I built were 7-300wm because they give up very little, if anything, to a 7STW and function through a factory mag box with room to spare. Both shoot under 3/8" and one shot a .211" group with the 2nd through the 4th rounds down the barrel and a .318" group the 5th through 7th rounds using a different seating depth. A few days later it went 11 for 12 on pigeons and rock chucks with some pretty spectacular kills. The same goes for your .300 Ackley......I've had .30-8mm's (300 Super), .308 Baer's, and .30-358 STA's (300 Jarrett) based on the 2.85" magnum case. The latter two are almost identical to your 300 Ackley but with 35 degree shoulders instead of 40 degree. The one I shoot the most is the 30-8mm because I don't have to fireform brass. Neck down 8mm mag and away you go. The chamber is perfect so I don't have to neck size at all (shoot it, knock the primers out, put new ones in, load it with powder and seat a new bullet. no sizing) and if I have to FL size I use a 8mm mag FL die with the expander removed. Much easier and cheaper than custom dies. The only nice thing about the 35 and 40 degree shoulders is you don't hardly have to trim your brass and the cases are less likely to separate ahead of the belt with multiple firings. I just had a case separate and stick in the chamber of my 30-8mm I took chuck hunting last week. It did log a most spectacular kill with a 150 Nosler BT doing 3550fps before that though. Parts were hanging in the sage brush behind where he was laying. :D I'm only at 2700' elevation so your speeds and mine won't be that much different. Generally I hunt at 6000' plus though. [/QUOTE]
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