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.264 Win Mag
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<blockquote data-quote="BillR" data-source="post: 549507" data-attributes="member: 462"><p>I've been working on getting 2 different .264 Win Mags to shoot. Both are Remington Sendero II's and except for scopes their identical up to a point. One has just a wee bit less freebore and that is about it. Both actually have too little free bore. Both have oversize firing pin holes. One is a bit larger than the other and no mater what load I use on either of them I get cratered primers. I'm trying to get them both to shoot with the Sierra 142 MK and Retumbo.</p><p>I started out 1.5 grains below book max and started working up. 61 grains is where I started. I was using Federal 215M magnum primers. With new Nosler custom brass, Retumbo at 61 through 65 grains, 215M Mag primer it shot patterns, not groups. No problem with bolt lift ever. I kept going carefully and worked my way up. I was getting a lot of soot coming back along the neck on the lower loads and as I worked up I was seeing less and less. About 67 grains it really started to come around. I was down to about a 1" group but just could not get it any better. I kept going and at 68 it seemed to act like it knew what it was supposed to do but was still getting around a 3/4" group. I talked to my gunsmith about the bolt's problem and he said after hunting season we can bush it and cure the problem or send them back to Remington. Neither are blowing primers. I showed him the target and he advised me to change my primers to Winchester Magnum LR primers. Didn't give me much for reason except he said it would tighten up my groups. </p><p>So yesterday I did just that. </p><p>Both rifles are shooting right at 1/4" groups</p><p>68 grains of Retumbo</p><p>3 times fired brass. (Neither gun likes new brass and really come into their own with 2-3 times fire brass) Dies set to neck size only.</p><p>Winchester LR Magnum primers.</p><p>142 grain SMK's</p><p>COL is 3.33 </p><p>Any longer and they both have trouble with accuracy again. This is about 10 thousands off the lands for both guns. Neither gun will chamber a factory 140 grain cartridge which I still had a box of Winchester ammo.</p><p>I'm getting around 3190 FPS with single digit spread except for 1 round decided to do 3210 which I think I can blame on the chronograph or maybe it was just a fluke. </p><p>Anyway that is where I am at with both guns. Neither seem to like anything different for OAL and neither seem to want a different primer but the load works very well for them.</p><p>Like everyone else says, start low and work up as every gun is different.</p></blockquote><p></p>
[QUOTE="BillR, post: 549507, member: 462"] I've been working on getting 2 different .264 Win Mags to shoot. Both are Remington Sendero II's and except for scopes their identical up to a point. One has just a wee bit less freebore and that is about it. Both actually have too little free bore. Both have oversize firing pin holes. One is a bit larger than the other and no mater what load I use on either of them I get cratered primers. I'm trying to get them both to shoot with the Sierra 142 MK and Retumbo. I started out 1.5 grains below book max and started working up. 61 grains is where I started. I was using Federal 215M magnum primers. With new Nosler custom brass, Retumbo at 61 through 65 grains, 215M Mag primer it shot patterns, not groups. No problem with bolt lift ever. I kept going carefully and worked my way up. I was getting a lot of soot coming back along the neck on the lower loads and as I worked up I was seeing less and less. About 67 grains it really started to come around. I was down to about a 1" group but just could not get it any better. I kept going and at 68 it seemed to act like it knew what it was supposed to do but was still getting around a 3/4" group. I talked to my gunsmith about the bolt's problem and he said after hunting season we can bush it and cure the problem or send them back to Remington. Neither are blowing primers. I showed him the target and he advised me to change my primers to Winchester Magnum LR primers. Didn't give me much for reason except he said it would tighten up my groups. So yesterday I did just that. Both rifles are shooting right at 1/4" groups 68 grains of Retumbo 3 times fired brass. (Neither gun likes new brass and really come into their own with 2-3 times fire brass) Dies set to neck size only. Winchester LR Magnum primers. 142 grain SMK's COL is 3.33 Any longer and they both have trouble with accuracy again. This is about 10 thousands off the lands for both guns. Neither gun will chamber a factory 140 grain cartridge which I still had a box of Winchester ammo. I'm getting around 3190 FPS with single digit spread except for 1 round decided to do 3210 which I think I can blame on the chronograph or maybe it was just a fluke. Anyway that is where I am at with both guns. Neither seem to like anything different for OAL and neither seem to want a different primer but the load works very well for them. Like everyone else says, start low and work up as every gun is different. [/QUOTE]
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