Quick Drop vs Danger Space

[SDHNTR]

When I go hunting, the only quick drop I want is to keep me out of danger space when the morning coffee hits.

 

[solarshooter]

I dont want to take this post off topic. Im not sure if this is a tangent or if its a subset of the DS vs QD conversation. So @B_Reynolds_AK if this seems off topic please feel free to shut me down.

Re bdc @solarshooter I may very well be doing things wrong or only in part. But I shoot 2 rifles mainly, a 6.5cm and a .270win. The 6.5 fits into quickdrop well. I basically dont use my calculator except as an occasional double check. Out to the range I routinely practice (generally 550yards and under just based on available place to shoot) the error is always less than .2mil and generally .1 so theres really no relevant correction factor. If I go up 8000’ in da—that is from my local areas at 500-2000’, going up to where we hunt in the rockies at 8 or 9k’ elavation—the amount of error actually is less. So theres is NO correction to make.

My 270 on the other hand does not fit well into quick drop, I have to use a correction factor to make the same hits that I do with the 6.5. Then when I go up in elevation I need an additional correction factor, it ends up being over .6mil off. Im too dumb to effectively manage this mental load, and I commonly make mistakes applying the right correction. I DONT think the correction changes enough in the course of one hunt that it requires much of a change in real life. BUT I havent been able with my level of practice to apply it effectively even within one zone of DA.

Bottom line: quick drop is not the bottleneck on my 6.5. But it may be the bottleneck on my 270. I would not bother with a bdc turret on my 6.5 for all the reasons you outlined. But I think a bdc solution might be a benefit for me on my .270. Id be curious what form or some of the other folks have to say about that, especially given how forgiving of ranging errors some of the flat shooting cartridges can be at more moderate distances.

What bullet and speed out of your 270? I know some folks are getting basically 6.5 PRC performance from a 270. Which I would consider right at the top end if not above the threshold of tolerable recoil for any decent volume of shooting.

 

[Macintosh]

129lrx @ about 3075fps mv.

BUT Im not talking volume of shooting. Im talking a ballistic solution for any shot. I practice with the 6.5, they are +\- the same gun so my practice easily transfers. Yes, recoil matters and thats a reason why someone might not choose a super-flat cartridge. Yet, the 270, 6.5prc and plenty of other flatter-shooting cartridges still exist, and those folks using them are still left to find a shooting solution—a corrected QD or a BDC turret of some sort are options for those folks. So while I agree that recoil matters, its not relevant for the question of “qd vs ds” or “if qd then why not bdc?”. Substitute a 22cm if you need in order to address the conceptual tradeoffs, I just tossed out the example Im most familiar with.

So my question—if your gun is too flat shooting to neatly fit into quick drop, then why not a bdc turret? The fact that it is a high danger-space cartridge mitigates some of the “close enough” factor inherent in any “quick” system. So if quick drop is “close enough”, then why ISNT a bdc turret also “close enough”, especially when paired with a high danger space cartridge? Or maybe the question is “since qd necessarily gains mental load with a high danger space cartridge, can one achieve something similar in terms of reducing mental load by utilizing a bdc turret with such a gun”?

 

[43.6N]

I think what’s been missing in this discussion is a real picture of how much is gained or lost by prioritizing QD vs DS.

Here is a table I made this morning comparing a prototypical QD load of 77tmk vs 2 DS loads. A 16” 22creed and a 6um.

Numbers were generated in shooter app based on this mornings DA of 775.

Cartridge (velocity)	Drop in inches (550-500yds)	Inch Drop/10yds	8” vs 10” target ranging error AKA Danger Space
77tmk 223 (2750)	74.9-57.7 (17.2”)	3.44”/10yds	23.2yds/29.0yds
77tmk 22cm (3050)	57.8-44.4 (13.4”)	2.68”/10yds	29.8yds/37.3yds
116tmk 6um (3100)	48.2-37.4 (10.8”)	2.16”/10yds	37.0yds/46.3yds

Between 500 and 550 yds the danger space certainly gets bigger for the faster cartridges. But the RSS 77tmk isnt exactly dropping like a rock either. Almost 30 yds of error (or danger space forgiveness) for a 10” target is very generous, and highlights how capable these systems are.

 

[4th_point]

129lrx @ about 3075fps mv.

BUT Im not talking volume of shooting. Im talking a ballistic solution for any shot. I practice with the 6.5, they are +\- the same gun so my practice easily transfers. Yes, recoil matters and thats a reason why someone might not choose a super-flat cartridge. Yet, the 270, 6.5prc and plenty of other flatter-shooting cartridges still exist, and those folks using them are still left to find a shooting solution—a corrected QD or a BDC turret of some sort are options for those folks. So while I agree that recoil matters, its not relevant for the question of “qd vs ds” or “if qd then why not bdc?”. Substitute a 22cm if you need in order to address the conceptual tradeoffs, I just tossed out the example Im most familiar with.

So my question—if your gun is too flat shooting to neatly fit into quick drop, then why not a bdc turret? The fact that it is a high danger-space cartridge mitigates some of the “close enough” factor inherent in any “quick” system. So if quick drop is “close enough”, then why ISNT a bdc turret also “close enough”, especially when paired with a high danger space cartridge? Or maybe the question is “since qd necessarily gains mental load with a high danger space cartridge, can one achieve something similar in terms of reducing mental load by utilizing a bdc turret with such a gun”?

Mac,

There's nothing wrong with a BDC reticle or BDC turret, as long as the shooter knows the limitations.

For your 270 w/129gr LRX, you could tweak the zero to make it line up better. I know, you may not want to tweak the zero. It's just a tradeoff to a quick solution.

I just made a post about this in the other thread, about tweaking the zero (orig post from 24hrcampfire in 2021):

https://rokslide.com/forums/threads/stuck-on-quick-drop.430425/page-7#post-4617238

For my primary shooting location, I could get your 129 LRX load to line up quite well using minus 3, but it would require a 200 yard zero - see screenshot below.

"Quick Drop", or whatever it's being called now, isn't anything new. Just another tool in the shooter's toolbox!

 

[Fireflyfishing]

How do you square Increased Danger Space with perfect Quick Drop?

These are both highly valued qualities, but, they don't necessarily compliment each other.

Where and when would you choose one gun over the other that is optimized for either?

Which will lead to increased effectiveness, hit rates and ultimately more killing?

Example 1: The 6 UM, developed with the intent of maximizing Danger Space. Does not line up with QD very well, ie 600 yards - 2.6 mil., requiring increased mental load to factor in the correction.

Example 2: 223 with 88 TMK's at 2750. Perfect Quick Drop ie 400 -2 mil, 500 - 3 mil, 600 - 4 mil.

So I read through this whole thread and others that are actively discussing the QD subject.

To answer your question: I just don’t care about QD or DS. The reality is I have range finding binos with an onboard calculator. I shoot with them often. They work…the end.

Prior to my current setup, I used Leica Geovid R binos…the QD method would have been great for those as they range only. But, that never stopped me from taking game at longer ranges. I still have those binos and if I break my Swaros, I’ll put them and QD into practice.

If they both go down, or regulations change to no range finders, I’ll get better at ranging with my reticle and put QD to use. And…utilize MPBR with a zippier cartridge.

But until then, I’m not going to lose sleep over-analyzing these two subjects. I’m not going to change my loads or rifle setups so it matches QD.

I know this won’t be a popular post, but I’m not concerned. What I’m doing is within my budget, legal, and fills my freezers.

 

[RockAndSage]

Correction factors can change significantly with DA real time within one day on a hunt.

Real question - how much does this actually matter with common cartridges, out to 400, on deer? How much more does it matter at 600?

 

[Formidilosus]

I know this won’t be a popular post, but I’m not concerned. What I’m doing is within my budget, legal, and fills my freezers.

Who would care if you use QD or not?