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Rifles, Reloading, Optics, Equipment
Reloading
Intrigued by truly big 6mms - and their absence in the shooting world
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<blockquote data-quote="AZShooter" data-source="post: 1917420" data-attributes="member: 5219"><p>I made a 6mm-264 win mag. Had the 7 Rem mag reamer ground to 6mm. Rechambered a 26" 243 Rem takeoff. Used necked down 264 win mag brass.</p><p>I already had a 6mm-284 in a heavy 30 barreled package shooting 105 Bergers at just under 3500 fps.</p><p></p><p>Had a Rem LA and wanted to make a sporter package I could use for hunting deer or antelope. It didn't work out so well. Due to twist I had to use a shorter bullet. Chose the 95 gr Berger. Worked up to 3650 fps. Accuracy came and went. The issue was perhaps the use of a rough factory barrel. The amount of powder burned in the barrel would cause fouling quickly as I was working up a load. I used CO2 to keep things cool. The fouling with less than a dozen shots would cause the groups to get larger fast. Never felt I could use it as consistency would change with so few rounds through the barrel. </p><p></p><p>FYI I made a 24" sporter 6mm-284 with another 243 Rem takeoff. Got 3465 fps with 95 gr Berger. Difference was consistent accuracy past 20 rounds. </p><p></p><p> Ross Seyfried wrote an article on his version the Mach IV. First barrel had to be thrown away due to a hard carbon ceramic like substance building up on the first barrel due to not cleaning it every dozen rounds or so. </p><p></p><p>He stated that he could get 4205 fps with IMR 7828 and 70 grain nosler BT and 4150 fps with 75 grain x bullet. IIRC this article was back in the 1990s. </p><p></p><p>Would love to read about it if you attempt using a larger case than a 6mm-284. Let us know how it works out for you.</p></blockquote><p></p>
[QUOTE="AZShooter, post: 1917420, member: 5219"] I made a 6mm-264 win mag. Had the 7 Rem mag reamer ground to 6mm. Rechambered a 26" 243 Rem takeoff. Used necked down 264 win mag brass. I already had a 6mm-284 in a heavy 30 barreled package shooting 105 Bergers at just under 3500 fps. Had a Rem LA and wanted to make a sporter package I could use for hunting deer or antelope. It didn't work out so well. Due to twist I had to use a shorter bullet. Chose the 95 gr Berger. Worked up to 3650 fps. Accuracy came and went. The issue was perhaps the use of a rough factory barrel. The amount of powder burned in the barrel would cause fouling quickly as I was working up a load. I used CO2 to keep things cool. The fouling with less than a dozen shots would cause the groups to get larger fast. Never felt I could use it as consistency would change with so few rounds through the barrel. FYI I made a 24" sporter 6mm-284 with another 243 Rem takeoff. Got 3465 fps with 95 gr Berger. Difference was consistent accuracy past 20 rounds. Ross Seyfried wrote an article on his version the Mach IV. First barrel had to be thrown away due to a hard carbon ceramic like substance building up on the first barrel due to not cleaning it every dozen rounds or so. He stated that he could get 4205 fps with IMR 7828 and 70 grain nosler BT and 4150 fps with 75 grain x bullet. IIRC this article was back in the 1990s. Would love to read about it if you attempt using a larger case than a 6mm-284. Let us know how it works out for you. [/QUOTE]
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Intrigued by truly big 6mms - and their absence in the shooting world
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