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Max point blank range

 
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  #1  
Old 09-19-2007, 09:07 AM
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Max point blank range

What is the standard (or most widely used) window size for determining maximum point blank range? I would like to know if I'm doing it right.

Thanks, Tom
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Old 09-19-2007, 10:44 AM
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That would depend on what you're shooting and what you'll accept as the maximum allowable distance for a hit above and below your point of aim. Theoretically an elk would allow you to have a much greater point blank range than a rabbit.

If you've determined that you will accept a hit anywhere in a 10" circle then you will accept a hit from 5" above to 5" below your point of aim and that would let you figure "your" acceptable point blank range. Do your ballistics figures and see at what ranges you will never be more than 5" above, or below your point of aim, and that will give you your maximum point blank range.

This is one of the reasons I sight all of my big game rifles in to be zeroed at 300 yards instead of 100 yards. If I'm presented with a quick shot out to may maximum point blank range then I can take that shot without sight adjustments and know where it will hit.

My thoughts are that even though some people may say that an animal may have a "kill zone" of a certain size, I never use that in figuring my pbr. I've heard people say that an elk has a kill zone of anywhere from 18-24" and I would never use those numbers for my pbr.

On my 7mm AM I figure my pbr on a 6" (+- 3") circle for big game. That gets me out to almost 500 yards. However, given the time to do so, I'd still dial for anything if I could. I've killed 4 big game animals so far with my 7mm AM and all have been dialed, even though I could have used my pbr on one.;)
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Old 09-19-2007, 12:52 PM
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ss; thanks, makes more sense than just picking a number. My go-to hunting rifle is a .30 x .378. I need to get in some range time and verify the external ballistics of my pet load, a 190 gr smkhp, then decide on what size window I'm comfortable with.

Thanks again, Tom
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Old 09-28-2007, 12:52 PM
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have you tried these websites External Ballistics Calculator JBM - Calculations - Trajectory (Basic)
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Old 09-28-2007, 05:00 PM
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ss7mm,

I like the way you do that, it surely works.

Mine is very similar. I zero at 100, verify impact point at different ranges, the PBR for my 300 RUM 210 Bergers', the distance is 265 yards zero, for a 6 inch diameter which is good to 315 yards. So from 0 to 315 I don't have to worry, here's the difference, though I was originally zeroed for 100 yards, my turret is set for 2.1 MOA which is zero at 265, and I hunt like that. If I have to shoot at 500 yards, with a 100 yards zero I need 5.0 MOA; but since the turret is already at 2.1 (very visible) I just continue to 5.0. Man I hope I made any sense of that! Sure is nice having them flat shooting Allen Mags.
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Old 09-28-2007, 07:40 PM
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PBR is junk science(junk balllistics) created by gun magazine guys. It means nothing. Point blank is 1" from the end of your barrel. I've read hundreds of articles about PBR and it's all marketing crapola. Just go by any good ballistics chart or make your own.
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  #7  
Old 09-28-2007, 11:00 PM
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Quote:
Originally Posted by silvertip-co View Post
PBR is junk science(junk balllistics) created by gun magazine guys. It means nothing. Point blank is 1" from the end of your barrel. I've read hundreds of articles about PBR and it's all marketing crapola. Just go by any good ballistics chart or make your own.
"au contraire mon ami". Created by gun magazine guys.......quite possible. I have no idea who first coined the phrase.

It means nothing..........Actually, because it is a phrase used by many, that has a definition related to shooting, it does mean something. See usually accepted definitions above. Unfortunately your definition is different from almost everyone else's definition.

it's all marketing crapola.......most advertising and marketing stuff is a form of crapola but, in all reality, to the majority of shooters in the good ol USA it does mean something. And by "the majority of shooters in the good ol USA" I mean those that might shoot half a box of shells a year and have no idea what a turret is nor do they even know that downrange ballistics even exist.

For the average, shoot it once and then go hunting in the fall person, if they understand the concept and where the bullet strikes in the dreaded PBR then they at least have one small bit of information they might not have otherwise.

Is it the best way to hunt.....nope, never said it was. Does it have any usefullness in the hunting field.......sure does if used properly.

Do I use it.......read the above post and you'll see that I dial for everything I possibly can. But, if presented with an ethical shot under conditions that will allow me to take the shot, then I will use the data and info contained within the confines of the PBR and make that shot.

Just go by any good ballistics chart or make your own......I have more charts, drop sheets, field test data and Palm help than I can pack at one time. But, whether you coined the phrase or some dim-witted writer of some $.25 gun rag did, it's out there so I say if somebody has a question about it then I'm gonna give them as much info as possible so they might understand what happens when they pull the trigger. If I just told them it's crap then how did I help them? And yes, if they ask about PBR I'd also bring up the basics of long range stuff and provide any help I could.

Why do you think 'ol Jack O'Connor sighted his venerable 270 in a little high at 100 yards? Regardless of what he called it, he was taking advantage of what is known today as the PBR of his gun and load. He didn't dial for anything but he knew where the bullet hit. Again, it hit somewhere in the worthless PBR.
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