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250g .308 WildCat?

 
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Old 12-04-2006, 01:00 AM
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Join Date: Dec 2001
Location: Mukilteo, WA
Posts: 1,091
Re: 250g .308 WildCat?

[ QUOTE ]
What scope is that drop chart for?
1/4 Mil clicks?
Number jumps @ 1K and 1500?

[/ QUOTE ]
Heh, somebody's paying attention. [img]/ubbthreads/images/graemlins/wink.gif[/img] It's for this one:



IOR 2.5-10. I had been planning to pick one up for the little 7-08 for a while, I finally did and I liked it so much I decided to use it this year on the 300. (And on a side note, that's the type of weather I had in mind when I picked the stock colors! [img]/ubbthreads/images/graemlins/laugh.gif[/img] )

Anyway, it says the clicks are 1/2 MOA. 26 MOA (52 clicks) to a turn (which is why the drop chart resets at 1K and 1.5K). Well, I don't know if they accidentally stuck the Euro internals in mine or if they just figured 1/8 Mil is close enough to 1/2 MOA (.45" vs. .52" at 100 yds per click) but when measured they are most certainly 1/8 Mil clicks--exactly--making the numbers 1/4 Mils.

I was actually happy to discover this when measuring as I like the reticle to match the adjustments. Though, I'd prefer 1/10 Mil to 1/8 Mil as it makes the math easier. Anyway, that's the reason--I doubt most would have ever noticed such a small difference, but when shooting at extreme ranges those clicks add up.

The 50 yd increments. It's a compromise between how much space you've got/want to paste over with tables, how far out you want the tables to go, how quickly you'll be able to find what you need in the tables.... Such compromises need to be made unless you're spitting out a number from a PDA for every shot in the field.

The 50 yds increments got somewhat annoying in the past, especially at longer ranges where there were more clicks between numbers. I did try decreasing the step at farther ranges--say every 100 yds out to 300 or 400, every 50 yds for the next couple hundred, every 25 for a couple hundred after that, then every 10, etc. I think that's probably the way to go for a drop chart for the ease of use/least space compromise. Still takes up a lot of space though.

Since I've started sticking the drop chart info directly onto the turret (cough, which could be called a BDC, cough) I've pretty much forgotten about the problem as the chart is only there for wind and reference/backup for elevation.

The problem I had with 50 yd increments out there a ways was mathematically interpolating MOA numbers then rounding to the nearest click. I'm pretty fair at math and can do it in my head better/more quickly than most people, but let's just say doing the above for some random range wasn't the quickest thing in the world, nor what I'd want to have to do in the heat of the moment. Beyond slowing me down, I was prone to make errors. If using only drop charts I'd break them down farther.

But when the same info is on the turret, I find the 50 yd increment to be just fine. You're no longer having to do math in your head--it's all visual. You have X00 yds marked here, you have X50 yds marked there, you get an actual range from the rangefinder between them. You simply crank the turret to the appropriate place between the two. It's all visual, no thinking or math required--simply crank it to the right spot.

I've found, besides being much, much faster, and causing fewer headaches, I make far fewer mistakes this way.

Of course at really extreme ranges, a PDA output is going to look better and better the farther you go, or even a drop chart printed in 10 or even 5 yd increments if you have the space for them and can find the right line quickly.

But in my case, I wasn't planning on shooting a deer that far away yet. As you can see the BDC above gets me to 950 yds in a single turn and I have complete confidence in its "twist and kill" accuracy out to that range when tailered for the load and conditions. And if I want to plink at a rock or a coyote or something at 1500, I can easily use the dropchart to get in the ballpark.

I wouldn't recommend these methods to anybody expecting to take game at farther ranges where more precision is required but it suits me quite well at the moment.
[ QUOTE ]
A bonded 265g ULD RBBT? That is great news! Do you think a 1 in 10 will stabilize this? Please keep us informed as you work these up.

[/ QUOTE ]
Ah, back to the subject. I don't know how a 1:10 will handle them. Only one way to find out. [img]/ubbthreads/images/graemlins/wink.gif[/img] I'd suggest trying a few and if they shoot, great. If not, wait until he gets the shorter jackets or decide your barrel is shot out and have a 1:9 screwed on. [img]/ubbthreads/images/graemlins/laugh.gif[/img] I'll let you know how they fly.
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