Thread: Trying something, Eric Cortina method of load development

Hopefully this will sort it. Will do a quick thread about what I have done but hopefully I can now stick to using my magnetospeed

cool, looks like you've converted your 270 to a muzzle loader.

Originally Posted by caberslash

Surely if you load to a standard COAL (like 2.8" on a .308) and it shoots good, call it a day?

Seen a lot of people claim their hunting rifle (Tikka/Savage/Howa whatever) is a 1/4 minute gun... not seen anyone outside of Olympic .22 being able to hold a rifle that steady (that wasn't locked in a shooting rest/vise), so how can you claim to have a rifle+ammo setup that shoots within that?

not to mention that 3 round groups mean zilch... benchrest is 5 or 10 shot groups.

Not many can shoot at that level but it’s fun trying.

that photo looks like you trying method I suggested to find max overall length....LOL

It's very hard to argue with Eric's results. I watched his video about neck sizing vs full length sizing and thought, alright I'll give it a go. It made a bit of a difference. These are two 3 shot groups shot about a month (possibly longer) apart, from the same rifle ( Howa 1500 308), same
type of projectiles from the same box, same powder from the same bottle, etc.

What I'm getting at is the only difference was I full length sized the brass and the group size halved. I know 3 shots is only indicative and maybe Jupiter was fully aligned with Uranus for the second group on the left, but...I'm converted. I'll be full length sizing for this rifle from now on.

I've always full length sized so your ^ results are good news!

Any of you guys watch Mark and Sam ?
https://www.youtube.com/watch?v=Dn1pRTvmP8k

Originally Posted by Moa Hunter

Any of you guys watch Mark and Sam ?
https://www.youtube.com/watch?v=Dn1pRTvmP8k

I have watchEd a few of their videos, am currently trialling their cleaning regime to try and avoid a fouling shot. I’ve only tried this once - shot at a rock at 500 From a clean barrel. Height was good but was about 5 inches right, was very windy though but seems promising. Also far easier than my normal cleaning regime.

Originally Posted by Tikka7mm08

I've always full length sized so your ^ results are good news!

I used to but I hate trimming and I usually have to after full length sizing.

I nearly always partial length resize....BECAUSE my first rifle the mighty poohseventy.hates necksized rounds,there is suspicion chamber is slightly offcentre of bore.
full length resize and brass last 3 firings...partial length resize and 6-8
for those who arent familiar with method..screw in full length resizer till it touches base then UNSCREW 1/2 a turn NOT screw in more....it bumps walls of case a little and does most of neck....its in my nosler #2 manual.

@dannyb you havent explained the above photo yet???

Originally Posted by Micky Duck

@dannyb you havent explained the above photo yet???

????

Originally Posted by dannyb

Hopefully this will sort it. Will do a quick thread about what I have done but hopefully I can now stick to using my magnetospeed

Attachment 150511

WTAF are you doing????? it looks like cleaning rod in through suppressor with something attached to suppressor with tie down.....
I know there is logical explanation...just cant figure it out...

Originally Posted by Micky Duck

WTAF are you doing????? it looks like cleaning rod in through suppressor with something attached to suppressor with tie down.....
I know there is logical explanation...just cant figure it out...

Tagged you in the thread that explains it bud

Originally Posted by Micky Duck

WTAF are you doing????? it looks like cleaning rod in through suppressor with something attached to suppressor with tie down.....
I know there is logical explanation...just cant figure it out...

I would suspect he is checking that the first shot thru his modified magnetospeed wont make it a one shot wonder.............ie clearance check