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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
SHERMAN MEGA LINE
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<blockquote data-quote="Idaho Trecker" data-source="post: 2346640" data-attributes="member: 67706"><p>After some setbacks and troubleshooting the 338 Mega is up and running! After actually measuring the barrel it is only 21.25". My testing has shown that this round does well with a shorter barrel also. My barrel is chambered with the "long" reamer which has a longer freebore. Rich was kind enough to get me a bit of the ADG 300 WSM brass to use for initial testing until the proper length brass is done.</p><p></p><p>So far I have basically just been able to run pressure tests, with very little accuracy testing, using the 250 grain Berger, 265 grain Long Range Accubond, and the 285 grain ELD-M. Powders tested so far include RL 26, N555, RL 16, Hybrid 100V, and IMR 4451.</p><p></p><p>Disclaimer: All loads with RL 26 and 285 ELD-M and 265 LRAB used a drop tube and with bullets seated .005-.010" off lands. 250 Berger was seated .080" off. All speeds taken with Magentospeed. These were just pressure tests in my rifle an not to be taken as load data. I stopped at pressure signs that were obvious to me (extractor marks, extra bolt lift, cratering or flattening of primer).</p><p></p><p>285 ELD-M Fed 215 primer RL 26</p><p>72 grains 2635 fps</p><p>73 grains 2666 fps</p><p>74 grains 2706 fps</p><p>75 grains 2747 and 2735 fps</p><p>75 grains was max pressure and capacity. Only the faintest shadow of an extractor mark</p><p></p><p>265 LRAB Fed 215 primer RL 26</p><p>74 grains 2741 fps</p><p>75 grains 2770 fps</p><p>76 grains 2807 fps</p><p>77 grains 2845 and 2856 fps</p><p>77 grains was also max pressure and capacity. Faint shadow of extractor mark but harder bolt lift</p><p></p><p>250 Berger Fed 215 primer RL 26</p><p>79 grains 2987 fps</p><p>80 grains 3013 fps</p><p>Both these loads were hot. I will post a picture of the 80 grain load case head. 80 grains was excessive and 79 grains is where I would normally stop and go 2 grains lower to start playing.</p><p>[ATTACH]314048[/ATTACH]</p><p></p><p>Fed 215 primer N555</p><p>72.5 grains 2758 fps</p><p>73.5 grains 2780 fps</p><p>74.5 grains 2810 fps</p><p>I could have possibly fit 1-2 more grains in but basically out of capacity. Didn't pressure out.</p><p></p><p>Fed 215 primer RL 16</p><p>69.5 grains 2791 fps</p><p>70.5 grains 2811 fps I made a jump to find pressure next.</p><p>73.5 grains 2915 fps This just had a slightest shadow of extractor mark. Basically out of capacity also.</p><p></p><p>Fed 215 primer Hybrid 100V</p><p>72.0 grains 2922 fps</p><p>I have used 100V quite a bit and had a good idea where to start which seemed right on. This seemed like no more pressure than where I stopped with other powders.</p><p></p><p>Fed 215 primer IMR 4451</p><p>71 grains 2852 fps</p><p>72 grains 2860 fps</p><p>73 grains 2905 fps pressure didnt seem bad but has to be close to top</p><p></p><p>I'm going to concentrate on groups when I get a chance next and possibly try another powder or two. Can't wait to try and smash a spring bear with this rifle since it missed my elk season this fall.</p></blockquote><p></p>
[QUOTE="Idaho Trecker, post: 2346640, member: 67706"] After some setbacks and troubleshooting the 338 Mega is up and running! After actually measuring the barrel it is only 21.25". My testing has shown that this round does well with a shorter barrel also. My barrel is chambered with the "long" reamer which has a longer freebore. Rich was kind enough to get me a bit of the ADG 300 WSM brass to use for initial testing until the proper length brass is done. So far I have basically just been able to run pressure tests, with very little accuracy testing, using the 250 grain Berger, 265 grain Long Range Accubond, and the 285 grain ELD-M. Powders tested so far include RL 26, N555, RL 16, Hybrid 100V, and IMR 4451. Disclaimer: All loads with RL 26 and 285 ELD-M and 265 LRAB used a drop tube and with bullets seated .005-.010" off lands. 250 Berger was seated .080" off. All speeds taken with Magentospeed. These were just pressure tests in my rifle an not to be taken as load data. I stopped at pressure signs that were obvious to me (extractor marks, extra bolt lift, cratering or flattening of primer). 285 ELD-M Fed 215 primer RL 26 72 grains 2635 fps 73 grains 2666 fps 74 grains 2706 fps 75 grains 2747 and 2735 fps 75 grains was max pressure and capacity. Only the faintest shadow of an extractor mark 265 LRAB Fed 215 primer RL 26 74 grains 2741 fps 75 grains 2770 fps 76 grains 2807 fps 77 grains 2845 and 2856 fps 77 grains was also max pressure and capacity. Faint shadow of extractor mark but harder bolt lift 250 Berger Fed 215 primer RL 26 79 grains 2987 fps 80 grains 3013 fps Both these loads were hot. I will post a picture of the 80 grain load case head. 80 grains was excessive and 79 grains is where I would normally stop and go 2 grains lower to start playing. [ATTACH]314048[/ATTACH] Fed 215 primer N555 72.5 grains 2758 fps 73.5 grains 2780 fps 74.5 grains 2810 fps I could have possibly fit 1-2 more grains in but basically out of capacity. Didn't pressure out. Fed 215 primer RL 16 69.5 grains 2791 fps 70.5 grains 2811 fps I made a jump to find pressure next. 73.5 grains 2915 fps This just had a slightest shadow of extractor mark. Basically out of capacity also. Fed 215 primer Hybrid 100V 72.0 grains 2922 fps I have used 100V quite a bit and had a good idea where to start which seemed right on. This seemed like no more pressure than where I stopped with other powders. Fed 215 primer IMR 4451 71 grains 2852 fps 72 grains 2860 fps 73 grains 2905 fps pressure didnt seem bad but has to be close to top I'm going to concentrate on groups when I get a chance next and possibly try another powder or two. Can't wait to try and smash a spring bear with this rifle since it missed my elk season this fall. [/QUOTE]
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