Thread: An accuracy challenge

Originally Posted by Tussock

MOA off hand would be an interesting (and for me, close to impossible) challenge.

Heavy barrels dont heat up slower. The walk less as they heat. As each round adds the same amount of heat, regardless of which barrel its fired in, it would be fairer to say thin walled barrels cool down faster.

Umm. Where shall we start.

Assume the firing of a shot imparts energy to the barrel, and each shot imparts roughly the same energy (over simplified I know but a reasonable approximation). The steel has a certain heat capacity and we'll also assume that it same material is used in both a skinny hunting barrel and a heavy target barrel. The mass of the target barrel will be greater so the average temperature rise in the heavier barrel will be less per shot. Also the heat will travel reasonably quickly through the metal (being a good conductor) and the dissipation of heat will therefore be more dependent on the interface with the atmosphere, and the rate will normally be expressed as an amount of energy (ie speed) per given AREA per measure of temperature difference. Since the heavy barrel is wider it will have a greater surface area and hence dissipate the heat quicker, certainly to start with the hotter skinny barrel will loose energy faster, but the heavier barrel will always be a lower temperature.

Yes doing engineering I lived and breathed thermodynamics for months.

G'Day Fella's,

Here is a 5 group shot with my .22-250AI.


I'm not sure what the rifle is capable of shooting, as it would need a better BR shooter than me, to do it!

Doh!
Homer

Gimp posted a challenge and so far in this post I've seen a few good groups but not 5 good groups, I have attached 6 targets all are 5 shot groups, 5 were shot at 100yds and 1 was shot at 200yds. All groups were measured independantly, all of the groups were shot outside with the wind doing what it does with bullets. Conditions were switchy and gusty.







So 0.192" + 0.242 + 0.211 +0.222 + 0.193" = 1.060" divide by 5 = 0.212"
0.396" divided by 2 (to get the 100 yd measurement) = 0.198"

1.060 + 0.198 = 1.258 divide by 6 (to get the aggregate of the 6 groups) = 0.2097"

Can this rifle do this all the time YES if I feed it the ammo it likes and I do MY part........the limiting factor is can "I" do this all the time "NO".......Kiwi

Originally Posted by Kiwishooter

Gimp posted a challenge and so far in this post I've seen a few good groups but not 5 good groups, I have attached 6 targets all are 5 shot groups, 5 were shot at 100yds and 1 was shot at 200yds. All groups were measured independantly, all of the groups were shot outside with the wind doing what it does with bullets. Conditions were switchy and gusty.







So 0.192" + 0.242 + 0.211 +0.222 + 0.193" = 1.060" divide by 5 = 0.212"
0.396" divided by 2 (to get the 100 yd measurement) = 0.198"

1.060 + 0.198 = 1.258 divide by 6 (to get the aggregate of the 6 groups) = 0.2097"

Can this rifle do this all the time YES if I feed it the ammo it likes and I do MY part........the limiting factor is can "I" do this all the time "NO".......Kiwi

Very nice shooting were the targets in question shot in competition with a target rifle?

Originally Posted by Homer

G'Day Fella's,

Here is a 5 group shot with my .22-250AI.
Attachment 1448

I'm not sure what the rifle is capable of shooting, as it would need a better BR shooter than me, to do it!

Doh!
Homer

What range do you shoot on in Canberra? Kiwi

Originally Posted by Homer

G'Day Fella's,

Here is a 5 group shot with my .22-250AI.
Attachment 1448


Doh!
Homer

I'm not sure what the rifle is capable of shooting, as it would need a better BR shooter than me, to do it!

It seems to be plenty good enough Homer. Its a hunting rig? If so and its consistent it wont need to be any better. Nice.