Re: COL and load data
Seating the bullet longer DOES NOT reduce pressure....it increases it...alot.
When a round is fired the bullet gets pushed out of the case a bit before it engages the rifling...at that point it stops for a couple of nanoseconds while the pressure builds up enough to push it on through the barrel....that bit of movement before engaging the rifling is "the cushion".
When you seat bullets "to the lands"...you remove that cushion...meaning, when the round is fired, the peak pressure is increased and so is the muzzle velocity.
I'm not that good at explaining things, but I know what I'm talking about...I tried to find an article for you but all I came up with was "forum posts".
All Remington barrels have a REALLY long "jump" to the lands . So seating to the lands will require either feeding the rounds one at a time by hand or an after market magazine box (Midway has them), they don't cost much ($42...IIRC) but they do require some gunsmithing to install.
The Berger VLD's do shoot much better when seated "to the lands"...most of the time.
Another thing...Be very careful with using that dummy round as a measuring tool. I know...it sounds simple enough, but if the neck is left too tight on the "dummy round" it can shove the bullet into the rifling and give you a measurement that may be as much as .050 too long...that's a very bad thing that could cost you a few fingers...or worse. I'm not trying to scare you or talk you out of it...I just don't want to see you get hurt...and when you start seating bullets to the lands, pressure spikes happen fast...real fast.
Be careful...do some more research and good luck.
Last edited by Ridgerunner665; 11-14-2008 at 05:17 AM..