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Long Range Varminter - Opinions Welcomed
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<blockquote data-quote="Darryl Cassel" data-source="post: 2168" data-attributes="member: 34"><p>Hello</p><p></p><p>Good questions you have presented.</p><p></p><p>After having several of the larger and smaller 7mm calibers in various barrel lengths, I can give you my opinion, for what it's worth.</p><p></p><p>Out of the two you mentioned, I would stick with the 7mm RUM Mag. or add to that, the straight 7MM mag as a consideration. The straight 7mm Mag will give you Less barrel wear and throat erosion.</p><p>Good brass is available for the straight 7 MM Mag but, not the 7mm RUM and you don't have to fool around and do a lot of fireforming of the cases. Load it and shoot it after picking the powder and bullet combination that works best. </p><p></p><p>I have a straight 7mm mag with a 30" barrel and it shoots very well. If you want to load it hot, you can stay with a 7/300 Weatherby with the right powder. The 7/300 Weatherby and the 7mm RUM are very close in ballistics.</p><p>I have proved that the straight 7mm Mag, with the correct powder will turn up 3200 to 3250 FPS with 162 gr and 168 gr bullets in a 30" barrel to some of my friends who said it couldn't be done and also own 7/300 Weatherby mags. </p><p>We matched them up side by side over the chronagraph.</p><p></p><p>I use 168 gr MK and 162 Gr Hornady Match and A-Max bullets in mine, exclusivly. The same bullets are used in my 7/300 Weatherby.</p><p></p><p>There are some very good bullets up to 180 gr available with high BCs and if you run out of reloads, factory ammo can be found everywhere. I have some custom bullets that are 176 gr and 186 Gr but, not available any longer.</p><p></p><p>If you like the 7mm bore and for your application, the 7mm Mag would be the way I would go especially with the 30" barrel you plan on installing. Necking down the 300 RUM case to a 7mm makes for a very inefficient case. That compares (almost) to a 378 Weatherby case being necked down to a 7mm. </p><p>We necked down a 378 case to 7mm and 6.5 long ago and found they were VERY inefficient in BOTH bore diameters. </p><p>Had to use a lot more powder to equal what a 7/300 or 6.5/300 Weatherby would give with the SAME bullet weights for each.</p><p></p><p>1000 to 1500 yards is NOT out of the question for the 7mm Mag, especially for ground hogs and whitetail deer plus the fact of longer barrel wear and case availability and quality.</p><p></p><p>The trick for the 7mm Mag is to have your smith chamber it so you can seat the bullets further out (not Weatherby Freebore) in the neck before touching the lands, to allow for the use of as much powder as possible.</p><p></p><p>Good luck to you.</p><p>Darryl Cassel</p><p></p><p>PS---You might want to consider a brake for it also. I find that you can shoot a medium to heavy recoil rifle MUCH more accurately with a brake installed. Some match shooters put brakes on the 6.5/284 too.</p><p></p><p>as an add on here---If you don't want to overwork the straight 7mm Mag Brass to maintain a higher velocity, I would go with the 7/300 Weatherby Mag over the 7MM RUM.</p><p></p><p>MUCH better brass available.</p><p></p><p>[ 06-26-2002: Message edited by: Darryl Cassel ]</p></blockquote><p></p>
[QUOTE="Darryl Cassel, post: 2168, member: 34"] Hello Good questions you have presented. After having several of the larger and smaller 7mm calibers in various barrel lengths, I can give you my opinion, for what it's worth. Out of the two you mentioned, I would stick with the 7mm RUM Mag. or add to that, the straight 7MM mag as a consideration. The straight 7mm Mag will give you Less barrel wear and throat erosion. Good brass is available for the straight 7 MM Mag but, not the 7mm RUM and you don't have to fool around and do a lot of fireforming of the cases. Load it and shoot it after picking the powder and bullet combination that works best. I have a straight 7mm mag with a 30" barrel and it shoots very well. If you want to load it hot, you can stay with a 7/300 Weatherby with the right powder. The 7/300 Weatherby and the 7mm RUM are very close in ballistics. I have proved that the straight 7mm Mag, with the correct powder will turn up 3200 to 3250 FPS with 162 gr and 168 gr bullets in a 30" barrel to some of my friends who said it couldn't be done and also own 7/300 Weatherby mags. We matched them up side by side over the chronagraph. I use 168 gr MK and 162 Gr Hornady Match and A-Max bullets in mine, exclusivly. The same bullets are used in my 7/300 Weatherby. There are some very good bullets up to 180 gr available with high BCs and if you run out of reloads, factory ammo can be found everywhere. I have some custom bullets that are 176 gr and 186 Gr but, not available any longer. If you like the 7mm bore and for your application, the 7mm Mag would be the way I would go especially with the 30" barrel you plan on installing. Necking down the 300 RUM case to a 7mm makes for a very inefficient case. That compares (almost) to a 378 Weatherby case being necked down to a 7mm. We necked down a 378 case to 7mm and 6.5 long ago and found they were VERY inefficient in BOTH bore diameters. Had to use a lot more powder to equal what a 7/300 or 6.5/300 Weatherby would give with the SAME bullet weights for each. 1000 to 1500 yards is NOT out of the question for the 7mm Mag, especially for ground hogs and whitetail deer plus the fact of longer barrel wear and case availability and quality. The trick for the 7mm Mag is to have your smith chamber it so you can seat the bullets further out (not Weatherby Freebore) in the neck before touching the lands, to allow for the use of as much powder as possible. Good luck to you. Darryl Cassel PS---You might want to consider a brake for it also. I find that you can shoot a medium to heavy recoil rifle MUCH more accurately with a brake installed. Some match shooters put brakes on the 6.5/284 too. as an add on here---If you don't want to overwork the straight 7mm Mag Brass to maintain a higher velocity, I would go with the 7/300 Weatherby Mag over the 7MM RUM. MUCH better brass available. [ 06-26-2002: Message edited by: Darryl Cassel ] [/QUOTE]
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