243 progress

[Mr.Snerdly]

Finally got a day to try out the 243 with the improvements I made. It seems to have helped, 2 best groups were just a little under .5 MO and about .65 MOA. I think the worst was right at 1 MOA. This is probably as good as I can expect with the scope. I don't see how it could be clearer or be any better for what it is but it is just a 9 power on the highest magnification.

Texas 10 sent me the varmint spring and it is SO much easier to shoot now. I wish I could get one for the 22-250 after seeing how much easier it is to shoot on the 243.. The 22-250 should be the best shooting gun but I will have to do a little more work on it. It is pretty good now, at least for me.

[celltech]

http://www.gunshack.com/savage-accu-trigger-target-spring-105270-sav105270-adjustable%20trigger

[CFJunkie]

It is good to see you are making progress and that you found a trigger you like.

Assuming your just under 0.5 inch group is .490, your standard deviation is 40% of your median of .650.
Your average group size is 0.713 for your 3 groups.
That high a standard deviation would indicate that there might be some 'shooter induced variation' in your results, or it could be a scope, bedding or barrel problem.
I would suspect that your set-up technique with your new rifle needs some work to consistent enough to get the groups sizes down.

Regardless, you'll need to shoot a lot more groups to make any reasonable conclusions.
One thing you can look forward to - you're probably going to reduce your group sizes as you get more comfortable with the trigger and the rifle.

I have found that for my good shooting rifles shooting 5-round groups, the amount of standard deviation is related to recoil.
-----------.308 ------ .264 -----.223
Average -- 0.443 ---- 0.341 ---- 0.295
Median --- 0.431 ---- 0.335 ---- 0.283
Std Dev -- 0.092 ---- 0.070 ---- 0.063
# Groups -- 173 ------ 446 ------ 506

If your .243 follows that slope, and you have an accurate rifle, your average might eventually average about 0.318 with a median of 0.309 and a std deviation of 0.067.
Based upon my quest to reduce my own 'shooter induced variations', I needed to shoot at least 150 5-round groups to begin really understand what set-up worked for me.

I don't know why you would conclude that the .22-250 would automatically be a better shooter than the .243.
From the rifle's perspective, the weight of the rifle, the trigger and the barrel quality determines how well the rifle will ever shoot.
Accuracy also requires a consistent shooter and the ability to find loads (powder, powder charge, bullet type, bullet weight, seating depth, & jump) that shoot well in a particular barrel.

Most .22-250s have no faster than a 1:12 twist (older ones are 1:14 twist) so they don't stabilize more than 55 grain bullets, maybe 60 grains.
Those lighter bullets are more susceptible to wind so if you live in a windy part of the country, you better use wind flags and learn how to read them.

I have two .22-250 rifles and neither is on the par with my more accurate rifles and I have more than 5000 rounds down range with the .22-250 rifles, so I am not a stranger to trying to make them shoot accurately.

[Mr.Snerdly]

There is no question things couldn't be better, myself included. My bench leaves a little bit to be desired for one thing. I think most of the problems with consistency are the setup and myself.