Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Reloading

Reloading Techniques For Reloading


Reply

Meplat trimming & bullet tipping?

 
LinkBack Thread Tools Display Modes
  #15  
Old 04-11-2011, 02:43 PM
Platinum Member
 
Join Date: Feb 2009
Location: Sedalia, MO
Posts: 1,253
Re: Meplat trimming & bullet tipping?

Well I'd HOPE he was shooting Bergers, not SMKs!
__________________
Kevin Thomas
Lapua USA
Reply With Quote
  #16  
Old 04-12-2011, 10:35 AM
Platinum Member
 
Join Date: Nov 2005
Location: Texas
Posts: 1,844
Re: Meplat trimming & bullet tipping?

Quote:
Originally Posted by Kevin Thomas View Post
Well I'd HOPE he was shooting Bergers, not SMKs!
HAHAHAHA!! If he shot SMK's then maybe Team Berger could beat Team Sierra.. Why did I know you would comment on this! LOL!!


If anyone wants to know something about this subject ask Kevin! He has forgotten more than most people will ever know on this subject! Sorry Kevin but now you can tell it like it really is regarding trimming meplats.
__________________
The Truth Is Not Always Good For Business!!
Reply With Quote
  #17  
Old 04-12-2011, 08:25 PM
Platinum Member
 
Join Date: Dec 2005
Posts: 2,114
Re: Meplat trimming & bullet tipping?

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.
Reply With Quote
  #18  
Old 04-12-2011, 08:33 PM
Gold Member
 
Join Date: Oct 2006
Posts: 718
Re: Meplat trimming & bullet tipping?

Bart

So are you currently using this method to sort bullets? Have you tried the SMK or Bergers?
Reply With Quote
  #19  
Old 04-12-2011, 09:07 PM
Platinum Member
 
Join Date: Dec 2008
Location: Northern Id.
Posts: 3,331
Re: Meplat trimming & bullet tipping?

Quote:
Originally Posted by Bart B View Post
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.
Bart...I would tend to agree. In making bullets the last few years, I have noticed that some of the OBVIOUS things make very little difference in poi and for no APPARENT reason, some of the bullets are out of the group. This would give support to what you are stating. Deformed tips are one of the lesser problems, if they are even noticeable? A nick on the heel, however; will throw things off in a hurry. Even a few tenths of grains weight difference doesn't have a lot of affect........Rich
Reply With Quote
  #20  
Old 04-13-2011, 03:27 AM
Platinum Member
 
Join Date: Dec 2005
Posts: 2,114
Re: Meplat trimming & bullet tipping?

Quote:
Originally Posted by lazylabs View Post
Bart...So are you currently using this method to sort bullets? Have you tried the SMK or Bergers?
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.

If one looks in a late 1971 (maybe 1970; I don't remember exactly) issue of NRA's American Rifleman magazine, there's a Lapua bullet ad with one of the 10-shot groups shot with some of these bullets. that group's barely under an inch. Lapua though the smallest one shot would be too "unbelievable" for use in advertising.

Not too shabby for a pre-'64 Model 70 action with a 26-inch Hart barrel conventionally epoxy bedded in a wood stock shooting full length sized WCC58 cases. This same rifle and ammo was also used to put 40 consecutive shots into 1.93 inches at 600 yards a week or so later.

I've mostly shot Sierra Match Kings but used Norma 139-gr. 6.5mm match bullets in a .264 Win. Mag. Also have used Berger 155-gr. 30 caliber bullets in a Palma rifle and thousands of military 172-gr. FMJBT match bullets in M118 7.62 NATO match ammo. Tried some Hornady match bullets in a .308, but gave up; they weren't as good as Sierra's.

Regarding bullet trimming and tipping for accuracy, I watched a test comparing Sierra's 30 caliber 190 HPMK vs Berger's 30 caliber 185 VLD bullet. Both were shot in the same .308 Win. rifle through chronographs at 10 feet and 995 yards. Muzzle velocity was about 2570 fps for both. The Berger's slowed down more than the Sierra's did; they lost more speed downrange. Proof that Sierra's had a higher BC. This was done as there was much discussion about the Berger's being a better long range bullet with their Very Low Drag claim. Proof's in the pudding....er, measuring. A good test indeed.
Reply With Quote
  #21  
Old 04-13-2011, 07:52 AM
Platinum Member
 
Join Date: Jun 2007
Location: Fredericksburg VA
Posts: 4,120
Re: Meplat trimming & bullet tipping?

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.

Meplat trimming & bullet tipping?

I agree with Boss Hoss, it is an absolute must with the 300 SMks

As far as spinning the bullets, Harold Vaughn built a similar spinner years ago, it is discussed in his book "Accuracy Facts". Vern Juenke used to make his Juenke machines that did something similar and allowed you to sort out those anomaly bullets. Worked for cases also. Sadly Vern quit making those about a year ago and you cannot find them.

BH
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: Meplat trimming & bullet tipping?
Thread Thread Starter Forum Replies Last Post
Terminal performance and Meplat trimming? bigngreen Rifles, Bullets, Barrels and Ballistics 12 11-29-2009 01:48 PM
meplat trimming and pointing die cheif wsm Reloading 1 10-24-2009 07:15 AM
300 grain, .338 SMK, BULLET POINTING - TIPPING? elkregulator Reloading 9 09-29-2009 09:51 AM
meplat trimming or bullet pointing new shooter Rifles, Bullets, Barrels and Ballistics 2 02-28-2008 07:38 PM
Meplat Trimming Lime Dawg Reloading 6 02-23-2008 10:38 PM

Current Poll
Spot & Stalk or Ambush For Western Deer?
MOSTLY - Spot & Stalk - 73.73%
1,027 Vote
MOSTLY - Ambush - 26.27%
366 Votes
Total Votes: 1,393
You may not vote on this poll.

All times are GMT -5. The time now is 01:29 PM.


Powered by vBulletin ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC