Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Rifles, Bullets, Barrels and Ballistics


Reply

Bullet Weight vs. Bearing Surface

 
LinkBack Thread Tools Display Modes
  #8  
Old 12-18-2010, 09:38 PM
Platinum Member
 
Join Date: Jan 2004
Location: Blackfoot, Idaho
Posts: 8,101
Re: Bullet Weight vs. Bearing Surface

Quote:
Originally Posted by padd54 View Post
Thanks, so I need to trim the meplats(tips) after I determine their Bearing Surface and disregard the weights ?

How much do I take off, and do they all need to be the same OAL?

I don't mind doing the detail work, it will be awhile before the weather is mild enough for me go out shooting.
Those that are paying attention to this detail AND winning matches are doing the above.

There is a reasonable point beyond which no noticiable improvement will be noticed. I suspect that the reasonable point progresses with distance being shot.

I'll be doing this process soon. These will be my steps:

1: Trim all bullets to the same length. (Base to meplate). Starting with the nastiest looking nose and some of the SMK points are really lopsided.

I don't think I want a meplat larger than .05, which to me is too large.

2: Not sure on this step until I try it. It will either be sort by weight or bearing surface length. The small amount of this sorting shows that overall bullet weight varies with bearing length and vise versa.

If I sort first by bearing surface length I'll then sort these by weight.

If I sort first by weight I'll sort these by bearing length.

I'll do this until it proves to me that it doesn't make any difference then I'll bag the whole idea and just go kill stuff.
__________________
I may be the slowest guy on the mountain . . . . but . . . . I'm on the mountain!
Reply With Quote
  #9  
Old 12-19-2010, 05:48 AM
Platinum Member
 
Join Date: Jan 2007
Location: PA
Posts: 1,077
Re: Bullet Weight vs. Bearing Surface

I use mostly Bergers and have found that the slight differences in bullet weight are not enough to be of concern, so I no longer weight them. Bearing surface is another matter. It affects the time the bullet is in the barrel, and is more critical. I separate those bullets and keep any with a .003" and less variance in BS. The others are my sighters, practice bullets, etc.

I shoot 500 meter (approx. 550 yds) groundhog matches. I trim meplats for 6mm, 6.5mm and 30 cal. bullets. I have not seen any great difference at extreme ranges, but it may be an advantage to do so at longer distances. The meplats need just a slight touch to uniform them, reducing the length about a thou or two. But then, it is important to open the point slightly with a tiny inside reamer. Meplat pointing will cause a small reduction in BC. It is not necessary to trim meplats so that all will finish with exact uniform total bullet lengths.

The newest fad is bullet pointing, which I have not tried. Seems like every month or so a new "super gadget" comes along, and I am getting weary of being the sucker for all of them.
Reply With Quote
  #10  
Old 12-19-2010, 10:52 AM
Platinum Member
 
Join Date: Jan 2004
Location: Blackfoot, Idaho
Posts: 8,101
Re: Bullet Weight vs. Bearing Surface

Quote:
Originally Posted by Gene View Post
Seems like every month or so a new "super gadget" comes along, and I am getting weary of being the sucker for all of them.
You too, eh!
__________________
I may be the slowest guy on the mountain . . . . but . . . . I'm on the mountain!
Reply With Quote
  #11  
Old 12-19-2010, 11:28 AM
Silver Member
 
Join Date: May 2009
Location: Central Oregon
Posts: 314
Re: Bullet Weight vs. Bearing Surface

Where would I get a "tiny reamer" to open the hole back up?

If I had one of the bullet pointers, would I still need to trim the meplats?

Thanks for the education,
Ray
__________________
"One of the ordinary modes, by which tyrants accomplish their purposes without resistance, is, by disarming the people, and making it an offense to keep arms."
-- Constitutional scholar and Supreme Court Justice Joseph Story, 1840
Reply With Quote
  #12  
Old 12-19-2010, 12:23 PM
Platinum Member
 
Join Date: Jan 2007
Location: PA
Posts: 1,077
Re: Bullet Weight vs. Bearing Surface

I have Kevin Cram's (Montour Co. Rifles) meplat trimmers, but others are similar. As stated above, I found no value in meplat trimming - other shooters disagree. You place a bullet in a hollow steel chamber of proper diameter, and the cap has a fluted cutter which you set to a fixed position; then twist cutter against the meplat. This reduces the meplat a few thou, hopefully so that all bullets measure the same total length. But in so doing, it flattens the hollow point. The point must be reopened, using the same chamber tool with a tiny reamer you twist and open the hollow point so that all are uniform. Here is an article and photos regarding meplat trimming.

Review of Montour Meplat Trimmer




A pointing tool, which I do not use, threads into your press similar to a sizing die. Squeezing the bullet into the pointer compresses the meplat, making it more aerodynamic. But you will need to uniform the meplats first. Here is a good article on the pointer:

Whidden Bullet Pointing Die within AccurateShooter.com

I suggest you read both articles carefully and note that results with these methods is very controversial.
Reply With Quote
  #13  
Old 12-19-2010, 12:42 PM
Silver Member
 
Join Date: May 2009
Location: Central Oregon
Posts: 314
Re: Bullet Weight vs. Bearing Surface

Thanks, I have read about both trimmers and pointer dies.

Has anyone tried this die system; Bullet Pointing Die, Bullet Tipping Die

I have the Sinclair Meplat Trimmer at this time. Is the MC Trimmer that much better?

Thanks,
Ray

Aw heck, I just ordered the Whidden Meplat trimmer that goes on the wilson trimmer. Any feedback from other users?
__________________
"One of the ordinary modes, by which tyrants accomplish their purposes without resistance, is, by disarming the people, and making it an offense to keep arms."
-- Constitutional scholar and Supreme Court Justice Joseph Story, 1840

Last edited by padd54; 12-19-2010 at 01:45 PM.
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: Bullet Weight vs. Bearing Surface
Thread Thread Starter Forum Replies Last Post
Bullet Bearing Surface Length Question(s) royinidaho Rifles, Bullets, Barrels and Ballistics 18 07-07-2013 08:07 AM
Bullet bearing surface question jmason Reloading 11 10-07-2008 05:09 PM
Measuring bullet bearing surface? Dan B Rifles, Bullets, Barrels and Ballistics 10 06-11-2006 06:16 AM
Need some help!!!!!! (Mearsuring Bearing Surface of Bullet) wildcat Reloading 2 09-04-2005 03:27 PM
Measuring Bullet Bearing Surface Troy Rifles, Bullets, Barrels and Ballistics 6 03-09-2004 09:57 PM

Current Poll
Do you archery hunt for elk?
YES - 34.32%
116 Votes
NO - 48.52%
164 Votes
Not yet, but I plan to. - 17.16%
58 Votes
Total Votes: 338
You may not vote on this poll.

All times are GMT -5. The time now is 03:13 AM.


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