Long range load development at 100 yards.

[P3S]

Mr Cortina- Would you recommend continuing with .003 testing?

 

[Erik Cortina]

Mr Cortina- Would you recommend continuing with .003 testing?

.117" looks good. Did you try .114"?

 

[P3S]

Not yet.

 

[Hollywood1009]

Tag Load development

 

[MahtewsSB]

Will this method be effective with a rifle that is using a khantrol clamp on muzzle brake? Or should the brake be taken off?

also, Erik when you say in step 4 to seat the bullet at jam - .020" is that meant to be a negative? thus actually jumping the bullet 20 thou for the powder testing?

 

[Erik Cortina]

Will this method be effective with a rifle that is using a khantrol clamp on muzzle brake? Or should the brake be taken off?

also, Erik when you say in step 4 to seat the bullet at jam - .020" is that meant to be a negative? thus actually jumping the bullet 20 thou for the powder testing?

The target does not know if you have a brake.

Yes, it's a negative sign.

 

[MahtewsSB]

Will this method be effective with a rifle that is using a khantrol clamp on muzzle brake? Or should the brake be taken off?

also, Erik when you say in step 4 to seat the bullet at jam - .020" is that meant to be a negative? thus actually jumping the bullet 20 thou for the powder testing?

The target does not know if you have a brake.

Yes, it's a negative sign.

lol true the target won't know the difference. i just didnt know if it would effect the harmonics to have it on. but the intention would be to use the gun with it on so i would assume it would be best to do load development with it on, just thought i'd run it by you to see what your thoughts were first

 

[Erik Cortina]

Will this method be effective with a rifle that is using a khantrol clamp on muzzle brake? Or should the brake be taken off?

also, Erik when you say in step 4 to seat the bullet at jam - .020" is that meant to be a negative? thus actually jumping the bullet 20 thou for the powder testing?

The target does not know if you have a brake.

Yes, it's a negative sign.

lol true the target won't know the difference. i just didnt know if it would effect the harmonics to have it on. but the intention would be to use the gun with it on so i would assume it would be best to do load development with it on, just thought i'd run it by you to see what your thoughts were first

Always do testing with the gun setup as you intend to use it.

 

[WVA SHOOTER]

Eric, I don't know if this question has been ask but have you seen any issues with results using the Magneto speed Unit. The barrel is a 28 inch varmint contour. I know it gives a different poi and that it should not affect overall accuracy. But Does it affect the results when powder charge testing?

 

[Erik Cortina]

Eric, I don't know if this question has been ask but have you seen any issues with results using the Magneto speed Unit. The barrel is a 28 inch varmint contour. I know it gives a different poi and that it should not affect overall accuracy. But Does it affect the results when powder charge testing?

Like the previous reply, I test rifle as intend to use it. I don't attach anything to the barrel that is not meant to be there. I personally would never test with a Magnetospeed attached. Maybe you can do your powder charge testing with it on and leave it off for seating depth testing.

I use an Oehler 35.

 

[JAnderson94]

Erik, I read the first several pages and then came to the last. Can you show me a picture doing the initial load tuning, then your 2nd time out with just a few different powder charges, and then when you finally finish with the seating depth? I'm having a hard time visualizing all of those steps together and shrinking the groups up into the .2s based on the large groups on your first post.

 

[Erik Cortina]

I'm planning to do a full load work up for my YouTube channel soon. I will cover all those steps there to help shooters understand how it works.

 

[no 23]

Hello Erik

Thanks for your info, i would like to think i've learnt a great deal by reading your posts in this forums.

Can you take a quick look at this target and tell me if you think i can improve anything by thuning the seating dept and then what load to select for thuning.

I was tempted to use 38,5 grs at the time i did the initial load testing and skip the seating dept thuning.

The reason i went for 38,5 is because i thought the grouping of the 38 grs load was more down to luck than it actualy being a better load, and 38,5 is in the middle of 3 very similar groups if i count the one that got away in 39 grs group as a bad wind call.

i made a mistake when i shoot the first and second group, one of the shoots of 37 grs was fired at 37,5 grs target (the 2nd lowest in group 2 belongs to group 1).

 

[MahtewsSB]

I'm planning to do a full load work up for my YouTube channel soon. I will cover all those steps there to help shooters understand how it works.

this would be extremely helpful. will keep an eye out for it

 

[Erik Cortina]

Hello Erik

Thanks for your info, i would like to think i've learnt a great deal by reading your posts in this forums.

Can you take a quick look at this target and tell me if you think i can improve anything by thuning the seating dept and then what load to select for thuning.

I was tempted to use 38,5 grs at the time i did the initial load testing and skip the seating dept thuning.

The reason i went for 38,5 is because i thought the grouping of the 38 grs load was more down to luck than it actualy being a better load, and 38,5 is in the middle of 3 very similar groups if i count the one that got away in 39 grs group as a bad wind call.

i made a mistake when i shoot the first and second group, one of the shoots of 37 grs was fired at 37,5 grs target (the 2nd lowest in group 2 belongs to group 1).

I think 38.5 is the one you should tune. It looks great already, but it's always a good idea to do a seating depth test to make sure it's as good as it gets or to at least know where on the node you are at. You may be on the ragged edge of the node which will cause you issues down the road.

 

[Erik Cortina]

I'm planning to do a full load work up for my YouTube channel soon. I will cover all those steps there to help shooters understand how it works.

this would be extremely helpful. will keep an eye out for it

I'll make sure I post it here when I start on that series.

 

[WVA SHOOTER]

Eric, what do you think. 105 Hybrid. 38.6 to 40.4. Flyer at 39.2 was driver error. 100 yards 1 inch dots. Wind from 5:30 6-8 mph.

 

[Erik Cortina]

Erik, what do you think. 105 Hybrid. 38.6 to 40.4. Flyer at 39.2 was driver error. 100 yards 1 inch dots. Wind from 5:30 6-8 mph.

Did you shoot over a chronograph?

 

[WVA SHOOTER]

No, I have the magneto speed unit so per the previous comments I ran without it. I can re run with it and compair if needed.

 

[Marksman63]

Erik, you probably answered it but no time to read all posts.

Have you ever verified, using QL, just for curiosity, if your best load would match the OBT theoretical load?
I did and both give similar results.