Whats the issue?

[Robinhood]

Trigger? Scope?

[Savageshooter12]

And I know it's not the shooter. This same exact thing has happened to me with varget and 50gr nbt. I'm starting to think it's the boat tail bullets. When I was shoot 1/2 MOA 100-300yards it was with flat base bullets 55gr vmax

[darkker]

So compared to the most current data, your load is lighter than starting loads, but running faster. No problem, but you obviously have a different burning rate than what Hodgy tested. Good info to keep about that lot.

Swapping the load into another rifle and expecting the same results, isn't going to happen. Saying it happened to you before, also doesn't rule out the shooter.

But to give you the benefit of the doubt, here are the questions to figure out if it's a component, or you.
1) Powder. You said you developed the load, and a different bullet also had this trouble. So is this the same lot of powder, or are you pretending burning rates don't change? Have you ever adjusted for the change? Have you adjustef the load for the different bullets? For the different rifles?
2) Barrel/crown. Inspect the crown, always a good bit of business. Check the bore. The coatings used in the Extreme powders, create a fouling called "hard carbon" and it's a real bear to get rid of. The smaller the bore, the faster it accumulates. Call Sierra and visit with them about it, if you want another choice on this.

3) Shooter.
If nothing else changed, you got yourself the Alabama shakes ��

[Deadshot2]

The coatings used in the Extreme powders, create a fouling called "hard carbon" and it's a real bear to get rid of. The smaller the bore, the faster it accumulates.

In a conversation with one of the owners of Benchmark Barrels he said he used a tight patch with some Simichrome Polish on it to remove this hard carbon. I do know you can't scrub it out with just bore cleaner.

[Savageshooter12]

[QUOTE=darkker;405772]So compared to the most current data, your load is lighter than starting loads, but running faster. No problem, but you obviously have a different burning rate than what Hodgy tested. Good info to keep about that lot.

Swapping the load into another rifle and expecting the same results, isn't going to happen. Saying it happened to you before, also doesn't rule out the shooter.

But to give you the benefit of the doubt, here are the questions to figure out if it's a component, or you.
1) Powder. You said you developed the load, and a different bullet also had this trouble. So is this the same lot of powder, or are you pretending burning rates don't change? Have you ever adjusted for the change? Have you adjustef the load for the different bullets? For the different rifles?
2) Barrel/crown. Inspect the crown, always a good bit of business. Check the bore. The coatings used in the Extreme powders, create a fouling called "hard carbon" and it's a real bear to get rid of. The smaller the bore, the faster it accumulates. Call Sierra and visit with them about it, if you want another choice on this.

3) Shooter.
If nothing else changed, you got yourself the Alabama shakes ��[/QUOT

U get your data from hogdon?? Okay cool. I went from the hornady book because last time I used hogdons I was blowing primers 2gr below max with varget and 55gr pills so I decided to start from what the book said. And ya 3616 was my average for 5 shots with a 14.3 SD. Shooting over the magnetospeed. And I wasn't hoping to to get the same results out of two guns. I thought it was weird that I could shoot a bug while with that load at 100 yards then at 200 it opened up a lot. Then with the other gun it shoots 1 1/2" at 100 and 1/2" at 200. Both with the same load. Only difference between the 2 guns being model and barrel length. I repeat I just thought it was weird.

[darkker]

[QUOTE=Savageshooter12;405791]

So compared to the most current data, your load is lighter than starting loads, but running faster. No problem, but you obviously have a different burning rate than what Hodgy tested. Good info to keep about that lot.

Swapping the load into another rifle and expecting the same results, isn't going to happen. Saying it happened to you before, also doesn't rule out the shooter.

But to give you the benefit of the doubt, here are the questions to figure out if it's a component, or you.
1) Powder. You said you developed the load, and a different bullet also had this trouble. So is this the same lot of powder, or are you pretending burning rates don't change? Have you ever adjusted for the change? Have you adjustef the load for the different bullets? For the different rifles?
2) Barrel/crown. Inspect the crown, always a good bit of business. Check the bore. The coatings used in the Extreme powders, create a fouling called "hard carbon" and it's a real bear to get rid of. The smaller the bore, the faster it accumulates. Call Sierra and visit with them about it, if you want another choice on this.

3) Shooter.
If nothing else changed, you got yourself the Alabama shakes ��[/QUOT

U get your data from hogdon?? Okay cool. I went from the hornady book because last time I used hogdons I was blowing primers 2gr below max with varget and 55gr pills so I decided to start from what the book said.

I don't use Hodgy, but that wasn't the point I was trying to make. My point was that no one lists what lots they test, but everyone cautions that lots can vary by 10%. So grabbing a random bottle of powder doesn't mean you have the same thing as was tested in the manual of your choice. Likewise it's accepted standard to test in SAAMI minimum spec pressure barrels, which will be tighter than a mass produced rifle barrel. So while unfortunate you may have to work up another load, it isn't uncommon to have very different results.