260 AI velocity ?

D

Donws2

Guest
Posted this on the center fire board and the guys thought I should ask here as it's more a 1000 yard question.

"I had a bit of a let down today. Shot a new to me 260 AI. It's a Savage actions with a Pac-Nor 30 inch 3 grove 1 in 8 twist barrel. My load is fire formed R-P brass, 37.0 Varget, WLR primers and lapua 123 Moly Scenars. I had thought that load would get 2750 to 2780 on the conservative side. Looks like the average of 10 shots is at 2725 FPS. Seems a little low for that much Varget. Is it because of the AI chamber or do I have more barrel than I need? Your thoughts? Donald "
 
You have the wrong powder if you want velocity in a 260AI with 123's.

My load ran 2930 fps with the 139's, and it could go faster safely, but I felt that load shot good and was plenty fast.

I would suggest at least try the H4350, but would lean toward an even slower powder in the 4831 range.
 
Well seems every one agrees that 4350 and 4831 would be a better powder and I have no doubt it is. I'll throw together a few and see if I get better velocity. Donald
 
Well tried 4831SC yesterday and the velocity were better but groups opened up to all most twice that as the same components but for the powder. I ran 47.0 grains of 4831 with no over pressure signs but none of the three OAL test groups I ran would hold better than 3/4 MOA at 200. The average was just over a MOA for all three. The slower Varget loads would shoot well under 1/2 MOA at the same distance. My best Varget groups were 1/2 inch and the best load averaged .667 inches for three groups averaged. All test groups were shot at 200 yards. I'm very pleased with the accuracy but would like to get the speed up for 1000 yard competitions. I'll try 4350 next. The shooting condition was perfect yesterday. Overcast skies and no wind at all for two hours. I did find that the 123's like a little jump. 0.005 shot the best groups. 0.010 off and 0.000 were OK and about the same. 0.003 Into the lands and 0.015 were quite horrid compare to the others. My best groups are at 2.293 OAL and that puts me just at .005 off the lands. Anyway more testing to come. Donald
 
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