i posted here 07/03/03 requesting input on 250AI loads.i appreciate the responses. i read somewhere that the best accuracy was obtained with parent cartridge load + 10%. sounded reasonable,so i tried it. the results are as follows:
75gr v-max- 48.4gr H-414(mag primers) 3525fp
85gr nosler bt 41gr RL15 3280fps
90gr sierra hpbt 40gr RL15 3125fps
100gr nosler bt 39.6gr RL15 3097fps

all of these shot 1/2 moa or better at 100yds.
the velocities are chronographed 5 shots averaged. the widest spread was the 75 v-max +/- 35fps. i am sure i can get more velocity, but why? during the development i shot 80 rounds of various combinations and chronographed them all. these were in truth the most accurate.
needless to say, i am very pleased with this project. GOOD LUCK and GOOD SHOOTING!!

wm,

Thanks for the data. My .250 AI is now complete, and was shipped and I should have it here in a couple of days. my .250AI . I will be sure to post whatever data I come up with, too.

WM,

I got to go to the range this weekend and shot my .250AI. The results are below. The group sizes were the average of two 3-shot groups. I got to chronograph some of the loads, but not all of them. None of the loads showed any signs of excessive pressure, not even a flattened primer. Cases fire-form very easily, with no cases lost in the process. I just loaded virgin brass � didn�t even run them through a resize die. Those loads with H322 were fire-forming loads in virgin Winchester .250 Savage brass. Those loads shown with IMR-4350 and H-414 were in fire-formed .250 AI cases. Conditions were gusty with winds switching from 4 o� clock to 6 o� clock. I think the rifle is going to shoot much better than this. Much more load development to be done, and much better shooting conditions to be had.



Bullet
Primer
Powder
Charge
Velocity
Group Size

87 gr Speer
WLR
H-322
31.0
2837
1.32�

100 gr Hornady
Fed 210M
H-414
40.0
2856
1.036�

100 gr Hornady
Fed 210M
H-414
41.0
2940
1.266"

100 gr Hornady
Fed 210M
H-414
42.0
Not recorded
.777�

100 gr Hornady
Fed 210M
IMR-4350
40.0
2842
.970�

100 gr Hornady
Fed 210M
IMR-4350
41.0
Not recorded
1.004�

100 gr Hornady
Fed 210M
IMR-4350
42.0
Not recorded
1.015�


John