22-250 55gr vs 75gr

[Kruger Human]

Testing will be done soon to compare the wind drifting between a 22-250, 55gr bullet @ 3750 fps and a a 75gr bullet @ 3350 fps.....and maybe a 243/6mm XC

Note:Meters, not Yards

Maximum distance: 300 meters: Any wind speed.

My theory is that the 75gr bullet will beat the 55gr bullet at distances beyond 250 meters , but the higher velocity of the 55gr will not come second at distances op to 250 meters.

When the wind is a factor at 300 meters and blows the 55gr bullet a lot, the 75 gr will also drift. Is it significant better to shoot 75 gr or should the shooter pay more attention to practice, learning to read wind , etc, etc.
And how much will the wind drift be between the two?

And what difference will it make if you improve the 22-250 to Ackley and shoot that 55gr another 150 fps quicker.
I think it will add to the advantage....faster bullet will do better in wind....up to X distance.

We spend a lot of time and money to build and test an experiment , but where I shoot, 90% of all shots are less than 300 meters and I don't need all those long barrels, Improved (expensive) gear, etc. A good rangefinder and a rifle that shoots tight to 300m and ability to read the conditions may be more significant than all the long bullets, special cases, etc......Some shooters don't have the budget for specialized expensive equipment.

Keep in mind....300 meters max.....

Bongo

 

[bheadboy]

i ran some of your data in Sierra software and here is the result

22-250 55gr Sierra BK @ 3750 /10mph wind 3:00 sighted at 100m drift = 6.18" at 70degree f
75gr hor A-max @ 3350 " " " " " =5.69"

22-250AI 55 gr Sierra BK @ 3900(may not be doable velocity) = 4.73" drift all else the same
75 hor A-Max @ 3500 ( not likely doable, maybe 3450)) =5.38" drift etc.

if you use a shorter bbl than 26" these velocities are a streach.

good luck

Bob

 

[357Mag]

Kruger -

Howdy !

If desired, you can run these types of ballsitics comparisons ( for free ) using available " Powley Computers " that can be found on-line.
Hornady Manu just recently added a ballsitics calc function, to their web site..

Yes... the question about addional fps velocity put onto a bullet ( 55gr .224cal as example ) is well taken.

Shooting varmints like groundhog in the USA ' Midwest, gives one opportunity to validate any such ballistics theories they might have ( 55 vs 75 ).
From my experience, the Hornady 55 "V"-Max ( prototype w/ longer boat tail ) was running out of steam @ 500, when sufficient KE for a clean-kill
@ 500yd ( on a groundhog ) was required.

I have long used 450ft lbs as the floor level for adequate KE for clean kills on groundhogs ( assumes a good chest hit ). I am aware that others believe this figure to be excessive. Using 450ft lb as a rudimentary guide then... how far out can your energy delivery system put 450 ft lb on target. As you intimated, a 75gr "A"-Max ( for example ) will be able to delivery 450 ft lbs out a lot further than any 55gr could. There's limits.

After making a 510 yd kill, the above realization became fully apparent. As a result, when I re-barrelled from a 24" 1-14 5-groove Hart
( the 500yd rifle ), I went w/ use of a 28" 1-8 5-groove. Both barrels were chambered for my own .22-35Rem wildcat.
My favorite load for the faster-twist barrel was: 75"A"-Max over 40.5gr AA3100 and Fed LR Match for 3,420fps.
My corrected math seems to indicate I still had 450ft bls on tap @ 937yd, and the barrel switch changed the rifle from a 500yd to 1,000yd
viable varmint/target gun.

It's alright for one to "go after " that extra 150fps ( example ) that you mentioned. Such gains, if nothing else... can impart either increased engagement range; or... more excess KE on-hand for enhanced kill assurance @ closer ranges.


With regards,
357Mag



When I rebarrelled

 

[alf]

Testing will be done soon to compare the wind drifting between a 22-250, 55gr bullet @ 3750 fps and a a 75gr bullet @ 3350 fps.....and maybe a 243/6mm XC

Maximum distance: 300 meters.

Whether it's yards, meters, or big steps, you're over thinking it for that distance....accuracy wins.....

 

[Kruger Human]

Thank you for the response.
I was out of competition shooting for more than 10 years.
Main reason is that we are hunters and the competition was just for fun/practice.
Then our gun laws changed and it became difficult to re-barrel ( It sometimes took 2 years to be re-licensed).

That has changed some and I am shooting 2 matches per year now.
I do not want to go high tech as I am still doing it for the fun and don't practice that often.

Let explain:
The competition is basically trying to simulate hunting circumstances where we shoot at 2D targets of animals, metal plates from 4" - 6 " etc. No rest other than natural rests, like rocks, tree limbs etc...or prone, sitting, etc.

There is no limit to equipment and the guys build themselves great rifles and add turret scopes with high magnifications, etc. No rangefinders can be used though.
Distances: 100 meters to 350 meters, but usually less than 5% of shots longer than 300 and I wold say 90% of the targets are closer than 250 meters.

I say that in these competitions I don't need a 22-250 with 75 gr bullets to beat my 22-250 with 55gr bullets, just for the sake of the wind? The wind deflection on my 55gr bullets at max velocity is not as significant is most people would want to believe.

[Keep in mind that where we are 1:8 twist barrels in this caliber is expensive and not easy to find]

This same opinion is related to 243 with long bullets to buck the wind compared to the 55gr 22-250 set-up.

 

[roadkill61]

It's not what you asked but for up to 300 yds check 204r with 32BK at 4100 or 20 br with 39gr BK at 3900.