Working up load

[Jinx-)]

Just got back from the range where I tested my new load. I only increased it by +1.3 grains, which was pushing 3200+ fps Previous load was shooting at 0.25 0.35 MOA and was going 3050 fps,but today with my new load the best I got was .85 MOA the rest of the groups where 1.2 MOA 1.3 MOA, and I was only shooting at 300 yards. My conclusion, going faster opens up groups.

 

[sp6x6]

What cartridge 1.3 gr. is a mile in a smaller case. not so much in a 338-378, but it is still a major jump, if you are towards max. I have had many rifles shoot accurate near max.

 

[Jinx-)]

That was my varminter in 223 and 55 gr vmax, what it likes is 25.7 grains of varget, today all my loads were 27.0 grains

 

[Mikecr]

Why would you think that going away from an accurate load by 1.3gr, wouldn't result in a change?
Do you think a gun will be accurate with any and every abstract charge?

 

[Long Dog]

1.3 grains is a big jump for a .223. I usually only increase in steps of .2 to .3 grains in my smaller cases. On my .338s I only make adjustments in .5 grain increments and have seen some significant changes to groups with a .5 grain adjustment. If my gun was shooting .25 MOA, I would not mess with it. If you were trying to get more velocity and a big jump opened your groups up, you may want to adjust seating depths to see if that helps. If not, try a diffrent powder or stick with your good shooting load.

 

[Jinx-)]

What thing really likes is RL-17 (very slow), it shoots 2.5 inches lower then Varget load, but its almost one hole 0.15 inch 5 shots at 100. The original load with Varget was 25.5 gr and yes I did increase it by 0.2 to 25.7 groups stayed the same, so today I thought why not lets just try to max out...

 

[Jinx-)]

Next thing I will decrease load from 27gr to 26.8 and working back unless I find sweet spot, the bullet seating depth I been tweaking with it last year and end up seating 0.018 of lands

 

[Jinx-)]

Why would you think that going away from an accurate load by 1.3gr, wouldn't result in a change?
Do you think a gun will be accurate with any and every abstract charge?

I wasn't expecting groups to open up that much, but that's almost +200 fps increase. So I will step down and I might just get it right...

 

[backwoods83]

You may wanna try a load with benchmark starting at about 23grns or a load with H4895 at about 24.5grns.

 

[MachV]

Well how fast do you want to miss?? Have yet to find a round that prefers Varget...Probably because it isnt as accurate @ full throttle. Tac/H335 however are about as good as it gets for full throttle loads with the 55s in the 223 with Benchmark showing promise in some rifles.
My J action Savage only likes the 55SPSX in front of a medium load of AA2200 so guess what I load for itlightbulb Yep you guessed it 23.5 grains of AA2200 a CCI 450 primer and the 55SPSX set @ 2.31. It aint fast,preaty or famous but it sure is a prairie dog killer inside of 250 yards!!

 

[strombeckj]

Try between 25.5 - 26.0 of IMR 8208xbr. I have found it to work wonders on the 50-60gr's.

Jon

 

[Jinx-)]

I did few loads with H335, was not bad, but Varget is making tighter groups, also I had some good results with IMR4064 and RL15. So what Benchmark and H4895 can yield? I guess I can try them out, thing is with 1:12 twist I have limited selection and for some reason it doesn't like BT bullets. Although 55 gr Nosler Ballistic Tips were the only BT grouping well.

 

[Jinx-)]

IMR 8208xbr that's something new, never heard of it, looks like it can me loaded in 308 and 260 I hope. Universal powder that's what I'm after
I tried Trail Boss, its subsonic alright, but grouped terribly like 3"@100.

 

[strombeckj]

I have found it delivers both speed and accuracy in my .223AI, .223 & 22-250 loads.
Just wish someone around here sold it in a keg at a decent price. Sportsmans has it for 21.99 lb.