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Rifles, Reloading, Optics, Equipment
Reloading
7mm Mag Norma Brass, too soft?
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<blockquote data-quote="naja302" data-source="post: 1009027" data-attributes="member: 69437"><p>Hey, first post here. Mostly I just come here to learn by reading other posts, but this is bugging me so I figured I ask for some advice. </p><p> </p><p>I gave up on the 338 Lapua after not being able to get acceptable accuracy with 3 different guns...the last of which being outrageously expensive (problem must be me). So I figured I would try this 7mm mag thing that everyone seems to think is so good (despite my pre-conceived notion that its basically equivalent to a 30-06).</p><p> </p><p>I have a sour taste from expensive guns that shoot 2MOA, so I bought a Remington 700 long range in 7mm mag for $750. I wanted fancy brass so I bought 100 pieces of Norma brass.</p><p> </p><p>Facts:</p><p></p><ul> <li data-xf-list-type="ul">I have fired less than 200 rounds through the gun</li> <li data-xf-list-type="ul">I am new to the 7mm Rem Mag</li> <li data-xf-list-type="ul">I have fired 13 different 5 shot groups under MOA and 6 of those were roughly .5MOA. This is outstanding and I have never had this kind of repeatable accuracy with anything.</li> <li data-xf-list-type="ul">I have shot mostly 168 bergers and they shot best at Zero clearance</li> <li data-xf-list-type="ul">Velocity is very slow and when I get to 2900 fps extraction is very stiff and I had to use a cleaning rod to remove several rounds.</li> <li data-xf-list-type="ul">I neck sized the brass and they would not chamber (without a fair amount of force) These rounds when chambered scraped the case immediately in front of the belt.</li> <li data-xf-list-type="ul">150 barnes TTSX shot great but same severe extaction trouble at 2850-2900 FPS (loaded with .050" clearance and I did not try any other depths)</li> <li data-xf-list-type="ul">Remington Factory 150 cor-lokts shot fine and chronographed 3112 without ext trouble</li> <li data-xf-list-type="ul">R/P brass is 10-15 grains heavier than the Norma brass</li> <li data-xf-list-type="ul">Norma brass varies by about 2 grains in weight</li> <li data-xf-list-type="ul">R/P brass varies by about 10 grains in weight</li> <li data-xf-list-type="ul">My chronographs reads normal type velocities with the other guns I am shooting so I don't thing that it is significantly off.</li> <li data-xf-list-type="ul">I was expecting 3000-3050 FPS with the 168g (maybe that's just not reasonable)</li> </ul><p>Brief synopsis of some of the loads I tried:</p><p></p><ul> <li data-xf-list-type="ul">68g H1000 with Norma brass and Fed 215 GMM primers @ 2744 FPS (69 and 70 grains gave significant extraction trouble)</li> <li data-xf-list-type="ul">68g Retumbo with Norma brass and Fed 215 GMM Primer @ 2825 FPS (69 and 70 grains gave significant extraction trouble)</li> <li data-xf-list-type="ul">150g TTSX with 59g H4831SC, Norma Brass, Fed 215 GMM primers @ 2672FPS (60 grains and above gave extraction trouble)</li> <li data-xf-list-type="ul">168 VLD, R/P brass, Fed 210 GMM, 70g Retumbo @ 2970FPS without ext trouble but poor accuracy</li> </ul><p>I read some stuff on here and realized that I should not utilize mag primers so I loaded some more up with Fed 210 GMM primer and now utilizing once fired Norma brass was able to shoot the 68g load of Retumbo at 2825 with only ext trouble with about 1 out of 10 shots. I loaded this load up to go hunting and after my hunt I went to the 1000 yard range and verified drop at 500, 800 and 1000 yards. Drop matched what my G7 BR2 gave me exactly so that gives me some reassurance in the velocity being at least close to correct.</p><p> </p><p>I am definitely seeing pressure signs, but I think the brass is just soft down in the belt region and its probably not actually a high pressure load or I would see faster velocities to go with the extreme pressure.</p><p> </p><p>I loaded some in some once fired R/P brass and group size doubled, but velocity increased by 150fps without ext trouble.</p><p> </p><p>I am a believer that pressure equals velocity. SO I am thus convinced that the norma brass is expanding excessively under normal pressures...Anyone agree?</p><p> </p><p>If I didn't own a chronographs I would be really happy cause this thing is shooting very well, but there is a big difference in 2825 and 3025 FPS (at least in my mind).</p><p> </p><p>Should I be happy with 2825 FPS?</p><p>Should I sort and prep R/P brass and hope to get good accuracy with that AND more velocity? </p><p> </p><p>Thanks, and I hope the above makes some sense.</p><p> </p><p>Danny</p></blockquote><p></p>
[QUOTE="naja302, post: 1009027, member: 69437"] Hey, first post here. Mostly I just come here to learn by reading other posts, but this is bugging me so I figured I ask for some advice. I gave up on the 338 Lapua after not being able to get acceptable accuracy with 3 different guns...the last of which being outrageously expensive (problem must be me). So I figured I would try this 7mm mag thing that everyone seems to think is so good (despite my pre-conceived notion that its basically equivalent to a 30-06). I have a sour taste from expensive guns that shoot 2MOA, so I bought a Remington 700 long range in 7mm mag for $750. I wanted fancy brass so I bought 100 pieces of Norma brass. Facts: [LIST] [*]I have fired less than 200 rounds through the gun [*]I am new to the 7mm Rem Mag [*]I have fired 13 different 5 shot groups under MOA and 6 of those were roughly .5MOA. This is outstanding and I have never had this kind of repeatable accuracy with anything. [*]I have shot mostly 168 bergers and they shot best at Zero clearance [*]Velocity is very slow and when I get to 2900 fps extraction is very stiff and I had to use a cleaning rod to remove several rounds. [*]I neck sized the brass and they would not chamber (without a fair amount of force) These rounds when chambered scraped the case immediately in front of the belt. [*]150 barnes TTSX shot great but same severe extaction trouble at 2850-2900 FPS (loaded with .050" clearance and I did not try any other depths) [*]Remington Factory 150 cor-lokts shot fine and chronographed 3112 without ext trouble [*]R/P brass is 10-15 grains heavier than the Norma brass [*]Norma brass varies by about 2 grains in weight [*]R/P brass varies by about 10 grains in weight [*]My chronographs reads normal type velocities with the other guns I am shooting so I don't thing that it is significantly off. [*]I was expecting 3000-3050 FPS with the 168g (maybe that's just not reasonable) [/LIST] Brief synopsis of some of the loads I tried: [LIST] [*]68g H1000 with Norma brass and Fed 215 GMM primers @ 2744 FPS (69 and 70 grains gave significant extraction trouble) [*]68g Retumbo with Norma brass and Fed 215 GMM Primer @ 2825 FPS (69 and 70 grains gave significant extraction trouble) [*]150g TTSX with 59g H4831SC, Norma Brass, Fed 215 GMM primers @ 2672FPS (60 grains and above gave extraction trouble) [*]168 VLD, R/P brass, Fed 210 GMM, 70g Retumbo @ 2970FPS without ext trouble but poor accuracy [/LIST] I read some stuff on here and realized that I should not utilize mag primers so I loaded some more up with Fed 210 GMM primer and now utilizing once fired Norma brass was able to shoot the 68g load of Retumbo at 2825 with only ext trouble with about 1 out of 10 shots. I loaded this load up to go hunting and after my hunt I went to the 1000 yard range and verified drop at 500, 800 and 1000 yards. Drop matched what my G7 BR2 gave me exactly so that gives me some reassurance in the velocity being at least close to correct. I am definitely seeing pressure signs, but I think the brass is just soft down in the belt region and its probably not actually a high pressure load or I would see faster velocities to go with the extreme pressure. I loaded some in some once fired R/P brass and group size doubled, but velocity increased by 150fps without ext trouble. I am a believer that pressure equals velocity. SO I am thus convinced that the norma brass is expanding excessively under normal pressures...Anyone agree? If I didn't own a chronographs I would be really happy cause this thing is shooting very well, but there is a big difference in 2825 and 3025 FPS (at least in my mind). Should I be happy with 2825 FPS? Should I sort and prep R/P brass and hope to get good accuracy with that AND more velocity? Thanks, and I hope the above makes some sense. Danny [/QUOTE]
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7mm Mag Norma Brass, too soft?
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