Well I'd HOPE he was shooting Bergers, not SMKs!
In wearing out several 30 caliber competition barrels, I've not seen any need to trim the bullet tip on HPMK Sierras to reshape them whatsoever. There's a better way to get bullets to shoot closer to the same hole than meplat trimming.
I'm convinced that unbalanced bullets cause more accuracy problems than anything else when all else is a repeatable as possible. Lowest spread in muzzle velocity, perfect bores and rifle bedding help, but my estimate is that no more than 20% of all the bullets in a box of even the best ones are perfectly balanced.
Back in the early 1970's, a friend of mine and his buddy (I believe the bullet forming die maker at Sierra Bullets) spun some Lapua match bullets in a collet chucked in a Dremel Moto Tool. An amp meter was connected to the tool's power cord. Spinning at 30,000 rpm, bullets that were more unbalanced caused the tool to draw more current; perfectly balanced ones required the least amount of current. The more unbalanced bullets were, the more centrifugal force they put on the bearings and more current was needed to spin the motor up to speed.
A few of the bullets were so unbalanced they flew out of the collet and bounced off the walls and ceiling. No wonder these Lapua 185-gr. rebated base FMJBT .3092" diameter match bullets were notorioius for shooting an occasional bad shot.
About 20% of each box of 100 were absolutely perfect in balance. Several dozen of these "perfectly balanced" bullets were loaded into full length sized .308 Win. cases and tested in a standard SAAMI chambered match rifle at 600 yards. Several 10-shot groups were fired. They ranged from about .700 inch up to 1.5 inches.
No, I'm not using this method to sort bullets. I just commented on what a friend did years ago. If someone made one and it worked well, he could make some money selling them.Bart...So are you currently using this method to sort bullets? Have you tried the SMK or Bergers?
Just who are the best LR shooters?Interesting thread on this on BR central where several tests were done and documented as much as 18" less wind deflection and 3 MOA elevation depending on the bullet. Done by the best LR shooters who know what they are doing and how to win.
Just who are the best LR shooters?
I ask because there's 3 or 4 disciplines who have excellent LR shooters. And there's not a bid of difference in their hardware's accuracy.
Meanwhile, back to meplatting and trimming, I don't think the Juenke tool would be as good as one that spun them upwards of 100,000 rpm or higher. The Juenke tool did a good job of measuring jacket and case wall thickness, but not the mass of core plus jacket spinning about its center of form. This is what the bullet does going down the barrel. Any offset between center of form and center of mass is what causes the bullet to exit the muzzle at an angle to the bore axis.
Surely there's a motor that would spin 'em that fast....somewhere. Even an air dirven one would work. Such as those used to spin rate gryos at ultra high speed.