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338 Norma Review By Ward W. Brien
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<blockquote data-quote="985" data-source="post: 315150"><p>Doug:</p><p></p><p>This is the same cartridge you may have been reading about. </p><p>Most of the guys that are building these feel that the optimum twist rate is 1:9.4.</p><p>However, the 1:9.1 Works Perfect. I started with my barrel length at 28" and obtained</p><p>2780 fps. (The 10" group at 1536 was due to a full value left to right wind that you could not see. No indicators whatsoever. If we had been shooting without that wind, the group would have been pretty small...</p><p></p><p>I then cut the barrel down to 24" and obtained a velocity of 2710 fps. That's not much of a velocity loss for four full inches.</p><p></p><p>Now I have cut the barrel down to 22.8", and with 1:9.1 twist rate I get two full twists and my accuracy is still phenomenal. I have not chronoed the loads yet however I increased the charge to 83.5 grains of R22 with Fed 215M primers, and will work up in .2 increments starting tomorrow. </p><p></p><p>On the second page of the article, where it shows the target and two bullet holes... That was made when I was breaking in the barrel. The hole on the left is round 21 and was shot out of a perfectly clean barrel. The hole to the right is round 22 and 23 out of 23 Total.</p><p></p><p>I absolutely Love this cartridge. Really...</p></blockquote><p></p>
[QUOTE="985, post: 315150"] Doug: This is the same cartridge you may have been reading about. Most of the guys that are building these feel that the optimum twist rate is 1:9.4. However, the 1:9.1 Works Perfect. I started with my barrel length at 28" and obtained 2780 fps. (The 10" group at 1536 was due to a full value left to right wind that you could not see. No indicators whatsoever. If we had been shooting without that wind, the group would have been pretty small... I then cut the barrel down to 24" and obtained a velocity of 2710 fps. That's not much of a velocity loss for four full inches. Now I have cut the barrel down to 22.8", and with 1:9.1 twist rate I get two full twists and my accuracy is still phenomenal. I have not chronoed the loads yet however I increased the charge to 83.5 grains of R22 with Fed 215M primers, and will work up in .2 increments starting tomorrow. On the second page of the article, where it shows the target and two bullet holes... That was made when I was breaking in the barrel. The hole on the left is round 21 and was shot out of a perfectly clean barrel. The hole to the right is round 22 and 23 out of 23 Total. I absolutely Love this cartridge. Really... [/QUOTE]
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