Thread: Trying something, Eric Cortina method of load development

I have tried 2 methods that sounded similar. Both were complete disasters.
The Eric Cantona method was just a kick in the face and the Ford Cortina method proved to be totally under powered.

Is this boarding on OCD ,

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Originally Posted by NRT

Is this boarding on OCD ,

Sent from my TA-1025 using Tapatalk

Possibly

Yeah, it feeds the OCD amongst us nicely.

Interesting recent research and articles on seating depth/jump on precisionrifleblog.com too.

I often wonder about the repeatability of the “stable” velocity loads - one day I’ll retest, as I’d never pick a load based on a three-shot target, but these methods (that I’m not knocking) seem to do it on one or two rounds.

Sometimes I do wish there was a simple answer...

Cheers, M

Originally Posted by Shearer

I have tried 2 methods that sounded similar. Both were complete disasters.
The Eric Cantona method was just a kick in the face and the Ford Cortina method proved to be totally under powered.

The Cortina method might be underpowered in your eyes, but it is a great improvement on the Morris Minor low light method that Danny and I were using

Originally Posted by Moa Hunter

The Cortina method might be underpowered in your eyes, but it is a great improvement on the Morris Minor low light method that Danny and I were using

pretty sure I was using the Lada Niva method

Well I've loaded up my first seating depth ladder
All charges at 56.5gn
3 x 2.760"
3 × 2.757"
3 × 2.754
3 × 2.751"

Now I just need a day of nice settled weather to put them on paper

Originally Posted by dannyb

Now I just need a day of nice settled weather to put them on paper

Ha ha, that’s funny, settled weather, good luck!

Keen to see results though.

Seating depth or jump/jam is important and important to be consistent but I really dont see how he is doing anything different than we have all been doing for years by measuring from "jam" than "just touch".
Its the exact same thing with a different datum point.

Originally Posted by veitnamcam

Seating depth or jump/jam is important and important to be consistent but I really dont see how he is doing anything different than we have all been doing for years by measuring from "jam" than "just touch".
Its the exact same thing with a different datum point.

Hey absolutely agree with you as stated earlier I don't think a lot of this is ground breaking or innovative, just the way it is explained and how the relationship of different aspects effects results and the methodical approach to finding a consistent charge weight first all just made sense to me.
I've had plenty of experts try and explain seating depth and charge weight variables to me and always ended up feeling bamboozled.
Cortina's way of explaining all this and showing results just clicked with my style of learning. We'll soon see if I can make it work, or not either way I'll post my results

Cortina anticipates that the throat will be eroded over time and that distance from the lands will change. His seating depth method takes this into account and seeks to find a seating node wide enough to maintain a good consistent group over time Not just for the first 100 shots.

Ive been watching the same vids. Most enjoyed the one taking apart the eagle eye video.

Only thing i would disagree with is that some loads cant be improved. I would send anyone the bag of fmj prvi partizan i bought (if i hadn't angrily binned them). There are turds that cant be polished!

@dannyb out of interest mate, what chronograph are you using mate?

Originally Posted by robh500

@dannyb out of interest mate, what chronograph are you using mate?

Caldwell ballistic precision chrono, once load development is done speed and drop are confirmed by shooting at longer ranges.
Normally I would use my magneto but it won't work with a suppressor fitted

What are these magical chronographs you speak of?
Kidding. Used one many years ago briefly but was always factory ammo guy.
Just starting with the 243 and then the 270 and maybe the 25-303 and 264 lol