Reading a ladder test

[Jeremy Henderson]

You might be able able to hit those speeds with a 28-30" barrel in an edge.

My Edge is shooting 250 OTM Hybrids at 3252 with 98 grains of H1000, CCI 250 primers out of a 30" tube

 

[Rhovee]

That's cookin. That will outrun a 300 Berger for a long ways at traditional 2800-2850 FPS range.

 

[knapper]

Today I did a ladder test with my 338 RUM and N570 powder under 250 grain Berger's. I want to see what the masses suggest that I do next. Here is a picture of the target:

View attachment 137209
And here are the velocities:
#1 - 98 gr 2957 FPS
#2 - 98.5 gr 2979 FPS
#3 - 99 gr 3014 FPS
#4 - 99.5 gr 3034 FPS
#5 - 100 gr 3034 FPS
#6 - 100.5 gr 3055 FPS
#7 - 101 gr 3066 FPS

View attachment 137210

I ran into pressure at 101 grains, flattened primer and ejector swipe. I planned on going up to 103.5 grains but had to stop. What would y'all do next? I'm thinking of loading up 5 shot groups of 99.2, 99.5, 99.8, and 100.1 grains and shooting groups to narrow my load down. Then I'll adjust seating depth if need be. Or should I load up 99.7 grains and try that? Let me know if you need any other info to determine where to proceed from here.

I believe I would put a 1/4 inch dia. RED dot at the center of the paper and try it again and shoot at the red dot every shot Dallas Richardson

 

[Blackdirt Cowboy]

Well, that's what I did. The dot isn't in the picture. I had my scope dialed to shoot high and left so as not to hit my aiming point.

 

[Remmy700]

Well, that's what I did. The dot isn't in the picture. I had my scope dialed to shoot high and left so as not to hit my aiming point.

U load up anymore test loads yet brother?

 

[Blackdirt Cowboy]

No sir. Been swamped at work. Been going from can till can't. Maybe this weekend.

 

[DavidleeCole]

I would load separate groups with sd and es in mind around shots #2@3 and #4@5 which ever had the tightest sd I would go with that load. Group is good but consent is better in my opinion

 

[Blackdirt Cowboy]

Finally got around to shooting more test loads. I loaded up 99.3 to 100.5 grain loads, which centers around shots 3 through 6. I think I settled on the 100.5 grain load. I'll load a few more up to verify, and then see if it holds together when I stretch it out. Here is the target for that load. I called the flier to the right before I ever saw the target. Had a flinch on that one.