Blew out my first primer

[Natebonebusta]

Went out to get data on my new to me 6.5 creedmoor. I tried a variety of powders. I used w760 data as it is supposed to be equivalent to h414. Max charge was 46gr. I started at 44.5 with .5gr steps. When the chrono registered 3,000fps I should have been suspicious but I finished that group which was under .5” at 100y. I missed seeing the ejector swipes on the headstamps of the brass.

The first shot at 45gr and I got a rush of wind and a smell I wasn’t used to. I knew something wasn’t right. Sure enough blown primer. Have to pull the other loads but I believe I’ll start at 42.9 and work to 43.8.

I’m not 100% sure w760 and h414 are exactly the same, otherwise they’d be called the same thing. I was hoping to get the 2900fps published speed, not 100fps faster!! Reloading is always a never quit learning event.

 

[ScLowCountry]

Be Careful and never start near max and never substitute powders. Could have been worse

 

[pattersonj11]

I hate that for you. The dangerous part yeah….but sounds like you were finding a sweet spot too. I know I would first be concerned with the danger but in the back of my head be pouty about it.

Hopefully dropping it down a notch will still give you good results. Seems like your sweet spot with that load will be pretty close to where you are. Hopefully you found a spike and going down a touch will take you back to good pressures.

You never know…sometimes the velocity can stay pretty good when backing down.

Good luck…..let us know what the results are.

 

[lasttombstone]

That's too much gun for squirrels.

 

[hog&deerhunter]

The burn rate for those 2 powders are similar.

Where did you get your load data from?

What bullet and weight?

Did you follow the data for the correct bullet weight?

I like 41.5 grs of H4350 under a 139gr Scenar. Have shot it out to 1K yards.

I am assuming you are using a lighter bullet with that kind of velocity

 

[Natebonebusta]

The burn rate for those 2 powders are similar.

Where did you get your load data from?

What bullet and weight?

Did you follow the data for the correct bullet weight?

I like 41.5 grs of H4350 under a 139gr Scenar. Have shot it out to 1K yards.

I am assuming you are using a lighter bullet with that kind of velocity

Load data came from the latest hornady manual for 129gr interlock. Charge weights were for w760 I loaded h414 in lieu of. I was able to get a couple good loads from h4350.

 

[hog&deerhunter]

New brass or how many times fired used brass? Brand?

 

[Natebonebusta]

New brass or how many times fired used brass? Brand?

Virgin starline. I was way over maximum after checking hodgdon data. Lesson learned for me. This ain’t my first reloading rodeo, but I certainly learned if it ain’t listed for a specific powder, I won’t be loading an “equivalent”

 

[pattersonj11]

Yeah….thats a bit hot.

Wouldnt be surprised if you worked up to the hodgeden max and still had more before pressure signs.

 

[bigten]

Never substitute powder charges from one to another, regardless of where they are in the burn chart. Too many times you will have issues.

 

[Bailey Boat]

Lots of amputees/blind folks thought "they are the same"...... until they aren't......

 

[71R/T]

I will say this and that is please be careful. On a positive note over the years shooting a .308 I have found that the discovered low node has generally resulted in the tightest groups. More isn't always better.

 

[JJWise]

I like 41.5 grs of H4350 under a 139gr Scenar.

That’s been my sweet spot as well, except IMR4350 with a 143ELDX