Oh I used to go through a couple 8lb jugs a year lol. If you want it we can get in touch, I’ll likely be going with LeverEvolution for this build. Never shipped anything Hazmat, so that’ll be new.
Unless I’m shooting three ten shot groups for an average and as a composite to proof test after load dev, I ignore SD. How can you establish a standard deviation from the norm without enough data to establish a norm? That said, when shooting 100yd groups you’re correct the ES/SD numbers wont really correlate to group size, they have more to do with dispersion at longer distances. I do always pay attention to ES, as it is useful in establishing a general consistency level to compare between loads. As they were in this case, because they are what caused me to find my accuracy issue. Well…remains to be seen. But they’re what kept me from tossing the barrel in a trash bin.
The groups are all abysmal. Both before and after throating. The best 10-shot group is 1.4”, the worst 2.5”. The consistent velocity spread got me to consider the crown, because it seemed likely that with consistent velocities something must be smacking them upon exiting the barrel. I found a raised ridge around the last half inch of the barrel near the muzzle, the guy I go to when I have barrels chambered/contoured confirmed the ridge, then told me that it’s common to crown first then use a tool to center the barrel when chambering which causes that raised ridge. He said it happens with $500 prefits every now and again. Which is fine this is my 7th cheapo & the first I’ve had any issues with. So I’m chopping off the last inch and revisiting. Dunno if that’s true, I’ve never worked in a barrel factory, but we’ll see.
Unless I’m shooting three ten shot groups for an average and as a composite to proof test after load dev, I ignore SD. How can you establish a standard deviation from the norm without enough data to establish a norm? That said, when shooting 100yd groups you’re correct the ES/SD numbers wont really correlate to group size, they have more to do with dispersion at longer distances. I do always pay attention to ES, as it is useful in establishing a general consistency level to compare between loads. As they were in this case, because they are what caused me to find my accuracy issue. Well…remains to be seen. But they’re what kept me from tossing the barrel in a trash bin.
The groups are all abysmal. Both before and after throating. The best 10-shot group is 1.4”, the worst 2.5”. The consistent velocity spread got me to consider the crown, because it seemed likely that with consistent velocities something must be smacking them upon exiting the barrel. I found a raised ridge around the last half inch of the barrel near the muzzle, the guy I go to when I have barrels chambered/contoured confirmed the ridge, then told me that it’s common to crown first then use a tool to center the barrel when chambering which causes that raised ridge. He said it happens with $500 prefits every now and again. Which is fine this is my 7th cheapo & the first I’ve had any issues with. So I’m chopping off the last inch and revisiting. Dunno if that’s true, I’ve never worked in a barrel factory, but we’ll see.