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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
New Barrel Break-in And Cleaning Methods
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<blockquote data-quote="J E Custom" data-source="post: 1734704" data-attributes="member: 2736"><p>A few months back I posted this and wanted to follow up with another test that was similar only using a much less powerful cartridge to see if the results were similar.</p><p></p><p>The cartridge was a 22 WMR with a new custom barrel.</p><p></p><p>After each shot, the barrel was cleaned and another shot followed. each shot was chronographed to try and identify when the barrel was broken in and if there was any advantage to a break in on such a small caliber.</p><p></p><p>Shot number and velocity.</p><p>1 = 1883</p><p>2 = 1893</p><p>3 = 1929</p><p>4 = 1944</p><p>5 = 1948</p><p>6 = 1950</p><p>7 = 1961</p><p>8 = 1970</p><p>9 = 1977</p><p>10 = 1981</p><p>11 = 1979</p><p>12 = 1984</p><p>13 = 1982</p><p>14 = 1977</p><p></p><p>The last 4 shots seemed to level out and shot an average of 1980.5 for an average velocity increase of 97.5 ft/sec over the first round. NOTE: the ammo used was factory 40 grain CCI and was not very consistent and with large SD after brake in.</p><p>while testing the 30 grain Vmax, group size and velocity greatly improved with a SD of 21 and a top velocity of 2307 ft/sec.</p><p></p><p>I have to try the 45 grain ammo and see if it will do anything for SD s And accuracy.</p><p>The best groups achieved during these test were just over 1/2 MOA @ 100 yards with the 30 grain ammo.</p><p></p><p>Most rim fire (LR) ammo Is held to a SAMMI standard of 4 % deviation in velocity, the 22 WMR is only held to 10 % and this is the reason that the WMR does not shoot as accurately as Other Rim Fire ammo. I couldn't find the SAMMI spec. for the 17 HMR</p><p>for comparison.</p><p></p><p>So once again I find brake in a valuable tool to season your barrel for early velocity gains and load development.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1734704, member: 2736"] A few months back I posted this and wanted to follow up with another test that was similar only using a much less powerful cartridge to see if the results were similar. The cartridge was a 22 WMR with a new custom barrel. After each shot, the barrel was cleaned and another shot followed. each shot was chronographed to try and identify when the barrel was broken in and if there was any advantage to a break in on such a small caliber. Shot number and velocity. 1 = 1883 2 = 1893 3 = 1929 4 = 1944 5 = 1948 6 = 1950 7 = 1961 8 = 1970 9 = 1977 10 = 1981 11 = 1979 12 = 1984 13 = 1982 14 = 1977 The last 4 shots seemed to level out and shot an average of 1980.5 for an average velocity increase of 97.5 ft/sec over the first round. NOTE: the ammo used was factory 40 grain CCI and was not very consistent and with large SD after brake in. while testing the 30 grain Vmax, group size and velocity greatly improved with a SD of 21 and a top velocity of 2307 ft/sec. I have to try the 45 grain ammo and see if it will do anything for SD s And accuracy. The best groups achieved during these test were just over 1/2 MOA @ 100 yards with the 30 grain ammo. Most rim fire (LR) ammo Is held to a SAMMI standard of 4 % deviation in velocity, the 22 WMR is only held to 10 % and this is the reason that the WMR does not shoot as accurately as Other Rim Fire ammo. I couldn't find the SAMMI spec. for the 17 HMR for comparison. So once again I find brake in a valuable tool to season your barrel for early velocity gains and load development. J E CUSTOM [/QUOTE]
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New Barrel Break-in And Cleaning Methods
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