semtav
11-21-2009, 11:44 AM
maybe trying to reinvent the wheel,
first, I'm shooting the carcano bullets as cast at .271, but putting on a gas check that winds up about .267. If the gas check is suppose to seal the gasses , is that too much gap?
Second, I thought I 'd get smart and put a 270 gas check on. (They are hard to find.) So I got an old tin (round tin of 1000 Hornady GC's in sealed can) only to measure them and find out they are .284 dia. Mislabeld tin ??
Now I look on the Gas check Sticky chart and find that the 270 GC's are supposed to be .266, the 6.5 .271 and the 7mm .290.
http://www.tmtpages.com/LinkSkyImages/forum_images/Gas_Check_Dimensions.gif
If the 270's are smaller than the 6.5's, is Gas check size really that critical.
Just a follow up, I looked at the chart again, and it shows dimension A on the 270 GC as .277 and dimension C as .266, so there must be a misprint on the chart.
thanks
first, I'm shooting the carcano bullets as cast at .271, but putting on a gas check that winds up about .267. If the gas check is suppose to seal the gasses , is that too much gap?
Second, I thought I 'd get smart and put a 270 gas check on. (They are hard to find.) So I got an old tin (round tin of 1000 Hornady GC's in sealed can) only to measure them and find out they are .284 dia. Mislabeld tin ??
Now I look on the Gas check Sticky chart and find that the 270 GC's are supposed to be .266, the 6.5 .271 and the 7mm .290.
http://www.tmtpages.com/LinkSkyImages/forum_images/Gas_Check_Dimensions.gif
If the 270's are smaller than the 6.5's, is Gas check size really that critical.
Just a follow up, I looked at the chart again, and it shows dimension A on the 270 GC as .277 and dimension C as .266, so there must be a misprint on the chart.
thanks