My first ladder test, but how do I read this exactly?

aric84

aric84

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I just finished shooting an attempted ladder test for my new remington 700 SPS Tac in .308, and the results are below. I'm not sure which groups are really the best ones to go with though... Shots 2 to 6 had the least spread with charge weights from 35.5gr to 37.5 gr of H4895. Shots 11 to 13 look good too, with 40 to 41 gr. So, if I am reading this correctly, I should be concentrating on the loads between 2 to 6 and 11 to 13 right? I'm thinking that if that's the case, 11 to 13 might be best for more even ignition...
Either way, I'm happy with the grouping for a $600 rifle, I think it's going to be a shooter.

Oh, loads were 168 gr Speer bthp match over H4895, full length sized federal cases, CCI 200 primers. Not the greatest for accurazy on the last 2 items, but it's all I got right now.

groups001.jpg
 
My first question would be what distance is the target 100 300?

If it is 100 I would suggest that you run the test again at a longer distance. What you are trying to determine is the amount of vertical you get with the ladder test so you can disregard Horizontal the effects of wind.

If this is a 300 yard target I would try 11-13 first it looks like the vertical is less then 1/2 a bullet diameter. 2nd group 2-6 looks much larger then a bullet dia and closer to 1 inch based on the grid of paper (assuming they are 1 inch squares).

Question what happen shot 14 was this driver error or was the shot true, the reason I ask is that 11-13 and 15 are all on a line (tight line) but 14 drops out almost 1 inch.

For grouping I would try a five shot group of charge 12.

The other thing I would suggest is to get a smaller aiming mark a couple of dots from a stationary store that are 1/4 or 1/2 inch in dia should allow less shooter error with the crosshairs centered at 300.

Trevor
 
Hi, thanks for the reply. It was shot at 100 yards and I should have used a smaller aiming mark for sure. I can't truly tell you what is up with 14, I do not relac pulling or flinching, but the other 11 to 13 are looking good. I think I will try and make a batch of load 12 and give it a shot at a longer range.

Thanks for the info!

Aric
 
I should have figured as much, I will probably still try the other two load ranges in seperate tests. We have a 300 yard range available as well so that will not be a problem. Thanks for the help guys!
 
Stupid question, (actually not) but how well do you shoot?

I ask because a ladder test really requires all other variables to be minimized as much as possible. If your technique, accessories and experience are such that with a quarter-minute gun you CAN shoot quarter minute, a ladder test means something. If you are not a .25MOA shooter, then stick to the more conventional group method. (shoot 3-5 with an identical combination)
 
Fair question. I'm a pretty good shot but Up to this point i have been doing mostly rimfire shooting. With my 180 gr loads i can put them within an inch regularly, but it is not a tuned load... I was shooting off a front rest and rear bag and the sights were dead still for each shot, took about an hour to do 17 shots. I think i will be putting a load together so that I can get more practice. During the testing i had a couple of consecutive shots that were touching so I think I'm close to at least a 1/2minute capable but without a 1/4 min capable rifle i can't tell for sure.
 
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