Why you should shoot a smaller cartridge

[rr2030]

I never got more than 1500 rounds out of my 22/250

??? what are you feeding it ? I have well over 3000 rounds down the pipe on my factory rem 700 barrel and it still shoots 1/2 MOA @ 100 yards and I usually shoot out to 600. Yes I will soon need to re-barrel. I have at least 1000 rounds of Federal Premium 55gr HPBT, the rest are 55gr FB Berger's @ 3500 fps. But 1500 rounds WOW !

 

[Evan]

View attachment 1068584 View attachment 1068586 View attachment 1068587OK. I accumulated 58 semester hours of math in college and then a MSEE. I'm pretty sure that 10-2=8. But, I ran the numbers to make sure. Result: No difference in f(10)-f(8) and f(10-8). You must be using somewhat different inputs than I am, or you're using a different trajectory calculator.
These are the runs for the 6.5 @ 10,8, and 2 mph, respectively.

I will simply apologize and say that I didn't investigate the underlying function to determine if that relationship held true before I said you were wrong. I instead utilized a process that would hold true regardless of the underlying function's structure. f(10)-f(8) does not equal f(10-8) for all functions, as an example: f(x)=x^2.

I'm glad that you are proud of your MSEE; that is a great accomplishment.

I've been shooting smaller gentler cartridges almost exclusively for the last few years. Haven't gone elk hunting for a few, and haven't shot my 270, which I usually use when rifle hunting. -- BUT--

I've been loading shells for a friend, and getting his 7 Rem-Mag tuned up and sighted in. I hate that freaking thing!! Kicks like a mule, two or three shots, and the barrel is scorching hot and POI starts to wander.

I guess I've turned into a big pussy when it comes to big cartridges. This rifle would easily drop a cape buffalo, or even an elephant, and guys have to use them for deer and elks??!! I'd wager that most guys packing these cannons in the woods, haven't shot them enough to hit an elk at a hundred, let alone the six or eight hundred yards they squawk about. If I'm starting to sound crazy, it's because my brains are scrambled from this shoulder buster. jd

I agree. Bigger guns distract from the fundamentals and ingrain bad habits. A friend of mine thinks anything less than a 165 out of a 30-06 is insufficient to kill elk and feels a 300 win mag is the "ideal" elk gun!

 

[rr2030]

View attachment 1068584 View attachment 1068586 View attachment 1068587OK. I accumulated 58 semester hours of math in college and then a MSEE. I'm pretty sure that 10-2=8. But, I ran the numbers to make sure. Result: No difference in f(10)-f(8) and f(10-8). You must be using somewhat different inputs than I am, or you're using a different trajectory calculator.
These are the runs for the 6.5 @ 10,8, and 2 mph, respectively.

Million man math ?

 

[Evan]

I get different numbers using JBM Ballistics Simplified Trajectory.

The 6.5 ELDM @ 2750, 2 mph @ 90 degrees, 300 yards is 0.9 inches.

The 20 VMax at 3600, same for other parameters is 1.8 inches.

Fundamentally, it’s twice the wind drift.

I'm using 5000ft altitude and a pressure of 24.8 for where I shoot here in Colorado .

 

[mikeinct]

Two words..."Barrel life"...Learn the wind calls, I'm loving the 6mmbr Improved, twice or better the life of my 243W. ...mike in ct

 

[GSPV]

I'm using 5000ft altitude and a pressure of 24.8 for where I shoot here in Colorado .

That perhaps explains the different numbers. I’ll run them later to see what I get.

On the other, for a relationship that is a function and that is continuous, f(x) - f(y) = f(x-y). I think that I have all the prerequisites correct. It *has* been a long time.

 

[Evan]

On the other, for a relationship that is a function and that is continuous, f(x) - f(y) = f(x-y). I think that I have all the prerequisites correct. It *has* been a long time.

I think we are missing a few conditions beyond just continuity. Entire classes of functions fail that relationship: polynomials, exponentials, sinusoidals. I'm more than a decade removed from my college years and having some trouble remembering which textbook to even pop open for this... maybe my linear algebra book? I'm pretty certain it's not in the calculus or diffeq books. Can't recall which class had the mathematical proofs...

 

[LCazador]

Only 2000 on a vartarg? You are tough on barrels!

No not tough on barrels, just very demanding on accuracy! I like to win and I like to hit what I'm shooting at!

 

[roadkill61]

If you are going to run the 6.5 and the VT at the very outer limits (40 gr vt at 3600-good luck) then why not run the 22-250 the same way Ie 55gr at 3750 ( yes doable)

 

[Evan]

If you are going to run the 6.5 and the VT at the very outer limits (40 gr vt at 3600-good luck) then why not run the 22-250 the same way Ie 55gr at 3750 ( yes doable)

Oh I know it is. I made it to 3850, but this reinforces my point:

22-250, 55vmax, 3850, now we're at 1 inch for a 10mph wind hold when it's only 8mph. Burn up your barrel significantly faster, not in the best accuracy node for my rifle, and all you gain is 2 tenths of an inch advantage at 300 yards over going 3500.

 

[Evan]

20VT, 40gn vmax, 3300, 1.3 inches vs 1.2 at 3600.

I think we can all agree that no amount of ballistics advantage actually saves you when missing the wind by 2mph! Your shot is going to be out there away from the others.