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Rifles, Reloading, Optics, Equipment
Reloading
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<blockquote data-quote="Capt. D" data-source="post: 1091994" data-attributes="member: 10225"><p>First; my rifle is a 7LRM. Bighorn action, 1 in 9 twist Bartlein barrel finished at 26" including brake, Mcmillian HTG adjustable stock and topped with a NF 5.5-22X50. </p><p> </p><p>The components I am using are Gunwerks brass, CCI 250 primers, H-1000 powder, and Berger 180 Hybrids.</p><p> </p><p>I started load developement seating the bullet at .015" off the lands. Powder charge weights ranged from 68 grains working up to 72 grains with no pressure signs. Charge weights from 70.5 grains to 72 grains all shot group sizes in the mid to high .4's, however the 72 grain group dropped about one minute (maintained group size but dropped 1") so I stopped there.</p><p> </p><p>Today I seated the bullet .005" off the lands and loaded charge weights ranged from 70.5 to 72 grains in half grain incriments. The 70.5gr 3 shot group was .092" (has to be the rifle, not me<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" />) the 71 grain 3 shot group was .352", the 71.5 grain group was .453", and the 72 grain group was .658" with an ever so slight ejector mark. All of the loads were shot with virgin brass. I do not have a chronograph so I don't know the speeds.</p><p> </p><p>Don't get me wrong, I love the rifle. My question is, with each powder charge increase the group as a whole moved down approximately .250 moa. Is this a barrel node thing or something else. I let the barrel cool between groups and made sure my front rest and rear bag were located in the same place each shot.</p><p> </p><p>Thanks</p></blockquote><p></p>
[QUOTE="Capt. D, post: 1091994, member: 10225"] First; my rifle is a 7LRM. Bighorn action, 1 in 9 twist Bartlein barrel finished at 26" including brake, Mcmillian HTG adjustable stock and topped with a NF 5.5-22X50. The components I am using are Gunwerks brass, CCI 250 primers, H-1000 powder, and Berger 180 Hybrids. I started load developement seating the bullet at .015" off the lands. Powder charge weights ranged from 68 grains working up to 72 grains with no pressure signs. Charge weights from 70.5 grains to 72 grains all shot group sizes in the mid to high .4's, however the 72 grain group dropped about one minute (maintained group size but dropped 1") so I stopped there. Today I seated the bullet .005" off the lands and loaded charge weights ranged from 70.5 to 72 grains in half grain incriments. The 70.5gr 3 shot group was .092" (has to be the rifle, not me:D) the 71 grain 3 shot group was .352", the 71.5 grain group was .453", and the 72 grain group was .658" with an ever so slight ejector mark. All of the loads were shot with virgin brass. I do not have a chronograph so I don't know the speeds. Don't get me wrong, I love the rifle. My question is, with each powder charge increase the group as a whole moved down approximately .250 moa. Is this a barrel node thing or something else. I let the barrel cool between groups and made sure my front rest and rear bag were located in the same place each shot. Thanks [/QUOTE]
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