Long Range Hunting Online Magazine same weight/ same POI ?
 User Name Remember Me? Password
 Home LRH Store Forums Long Range Rifles Articles Reviews Group Hunts Shooting Classes G7 Ballistics Calculator Rules & FAQ Register Search Today's Posts Mark Forums Read

same weight/ same POI ?

#8
03-08-2012, 11:11 AM
 Platinum Member Join Date: Apr 2010 Location: Allen, TX Posts: 2,608
Re: same weight/ same POI ?

Quote:
 Originally Posted by Mada lets say we have two cartridges. same velocity, identical everything, except the bullet. the bullets weigh the same but the difference in BC is 0.075 is it possible to achieve the same zero at 100yrds?
You can establish a 100yd zero with any and all rifles.

But, the trajectory at varying distances and the windage compensation will always be different unless they at least have the same BC and same MV.

.075 is not a huge difference. So, it all depends on how exact you want them to be.

You can take a lower BC bullet and shoot it a little faster to keep the trajectory similar to the higher BC bullet. But, it's not going to be identical beyond some distance.

-- richard
#9
03-08-2012, 12:00 PM
 Platinum Member Join Date: Jun 2010 Location: greenwood, IN Posts: 4,015
Re: same weight/ same POI ?

Quote:
 Originally Posted by Mada lets say we have two cartridges. same velocity, identical everything, except the bullet. the bullets weigh the same but the difference in BC is 0.075 is it possible to achieve the same zero at 100yrds?
they will not have the same trajectory or flight path if everything is identical otherwise. In this case it won't be very much at all, but they still will be different. There is an algerbraic equation to plot this that figures in gravitational pull and velocity plus the other stuff, but it's easier to plot it out with a PC program if it will allow you go go three or four places in the B/C.
gary
#10
03-08-2012, 04:16 PM
 Platinum Member Join Date: Dec 2005 Posts: 2,483
Re: same weight/ same POI ?

Quote:
 Originally Posted by Mada I read somewhere in my Hornady manual v8 that bullets with the same weight or design (i cbf to find and site) will fly the same? has anybody heard of or know of such?
I doubt anyone could tell the difference between two bullets whose BC varies by 20% at 100 yards. At 200 yards, it will start to show.

What the heck does "i cbf to find and site" mean? I hope you're not using smart phone "texting" language on this web site. I don't have a dictionary to find out what all those abbreviations mean. And, if you are, I think it's very presumptious on your part that all of us know that impersonal communication language.
#11
03-08-2012, 08:06 PM
 Bronze Member Join Date: Sep 2011 Location: Las Vegas, NV Posts: 92
Re: same weight/ same POI ?

Quote:
 Originally Posted by Bart B I doubt anyone could tell the difference between two bullets whose BC varies by 20% at 100 yards. At 200 yards, it will start to show. What the heck does "i cbf to find and site" mean? I hope you're not using smart phone "texting" language on this web site. I don't have a dictionary to find out what all those abbreviations mean. And, if you are, I think it's very presumptious on your part that all of us know that impersonal communication language.

CBF just means "cant be bothered" or "cant be f**k" sorry, its a web term, assumed you guys knew what it means.. again sorry
#12
03-08-2012, 08:08 PM
 Bronze Member Join Date: Sep 2011 Location: Las Vegas, NV Posts: 92
Re: same weight/ same POI ?

Thanks alot for all of your explanations, much thanks
#13
03-08-2012, 08:12 PM
 Gold Member Join Date: Apr 2009 Location: Carrollton, Ohio Posts: 637
Re: same weight/ same POI ?

I shoot a Hornady 150gr FMJ and a Hornady 150gr SST in the same rifle. The charge weight is .5grains different, the BC is .017 different; the POI difference is less than moa at 400 yards.

So I practice with the FMJs that are 2/3s the price of the SSTs.
#14
03-09-2012, 12:23 AM
 Platinum Member Join Date: Aug 2003 Location: NC, oceanfront Posts: 3,877
Re: same weight/ same POI ?

Another qualifier to the question is changes to seated ogive distance to lands -w/resp to a gun's personality. This, because tune greatly affects POI.
And going from a tangent ogive to secant for example, all else equal, can have a big affect on POI and performance in general until optimum seating is again determined.

I can't imagine changing bullets, even lot to lot of the same, without seeing some difference.

 Bookmarks

 Thread Tools Display Modes Linear Mode

 Similar Threads for: same weight/ same POI ? Thread Thread Starter Forum Replies Last Post Weblake Rifles, Bullets, Barrels & Ballistics 8 12-29-2011 01:17 AM bubba41 Long Range Hunting & Shooting 5 06-06-2011 02:27 AM IdahoJoe Rifles, Bullets, Barrels & Ballistics 3 02-08-2011 06:17 PM SES50 Gunsmithing 5 11-22-2007 04:16 AM Troy Rifles, Bullets, Barrels & Ballistics 1 03-02-2006 10:48 PM

All times are GMT -5. The time now is 01:15 PM.

 Contact Us - Long Range Hunting Online Magazine - Privacy Statement - Terms of Service - Top