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Hunting
Long Range Hunting & Shooting
Load Development 7mm Rem Mag Berger 195 Extreme Outer Limits (EOL)
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<blockquote data-quote="jdmecomber" data-source="post: 1349821" data-attributes="member: 94549"><p><strong>Cold Ammunition Testing:</strong></p><p><strong></strong></p><p>I left the gun and four rounds of ammunition outside this morning from around 1:00 am till around 7:30 am. The temperature dropped to around 32 degrees. </p><p></p><p>Last night, I cleaned the brass and went over all the brass techniques one more time. I uniformed primer pockets, once over on flash holes, trimmed everything to length, chamfer and deburred. I took my time with the powder. </p><p></p><p><strong>Four rounds fired at 33 degrees:</strong></p><p><strong></strong></p><p>Round 1: 2897</p><p>Round 2: 2879</p><p>Round 3: 2885</p><p>Round 4: 2878</p><p></p><p>It looks like the best I can do is a 19 feet per second spread. </p><p></p><p>I know this is not all that scientific but i have yet to find a powder that didn't have a drop in velocity when the gun and ammunition were cold. </p><p></p><p><strong>60 degrees vs 33 degrees:</strong></p><p></p><p>The average speed at 60 degrees was 2923 and the average speed at 33 degrees was 2884. It looks like a 39 FPS difference. </p><p></p><p>I will try this with my .243 Winchester with H4831SC in the morning if it's around freezing.</p></blockquote><p></p>
[QUOTE="jdmecomber, post: 1349821, member: 94549"] [B]Cold Ammunition Testing: [/B] I left the gun and four rounds of ammunition outside this morning from around 1:00 am till around 7:30 am. The temperature dropped to around 32 degrees. Last night, I cleaned the brass and went over all the brass techniques one more time. I uniformed primer pockets, once over on flash holes, trimmed everything to length, chamfer and deburred. I took my time with the powder. [B]Four rounds fired at 33 degrees: [/B] Round 1: 2897 Round 2: 2879 Round 3: 2885 Round 4: 2878 It looks like the best I can do is a 19 feet per second spread. I know this is not all that scientific but i have yet to find a powder that didn't have a drop in velocity when the gun and ammunition were cold. [B]60 degrees vs 33 degrees:[/B] The average speed at 60 degrees was 2923 and the average speed at 33 degrees was 2884. It looks like a 39 FPS difference. I will try this with my .243 Winchester with H4831SC in the morning if it's around freezing. [B][/B] [/QUOTE]
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Load Development 7mm Rem Mag Berger 195 Extreme Outer Limits (EOL)
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