A study in seating depth and primers

[Pathfinder76]

Interesting.

[Lefty-Canuck]

Thanks for posting. I did a little experiment last year comparing some primers using my Chrony.

http://www.outdoorsmenforum.ca/showt...hlight=Primers

LC

[gitrdun]

The data shows good results with CCI 200 and 3.636 coal and Fed. with 3.625 coal. Where to go from there? For my part, I would repeat those two with a 5 shot sequence over chrony to see which one of the two presents lowest deviation. I doubt that there will be a huge difference in muzzle velocity between the two, so low std. deviation would be my pick. Nice job.

[Robmcleod82]

Sorry chuck I can't really agree that you have proved anything yet, a single 3 shot group for each condition doesn't give enough of a base to make much of a decision. Need more groups man

[spentround]

Thanks chuck for sharing your info....brightened my morning with an interesting puzzle...

[gitrdun]

Rob, groups 5 and 6 are pretty well no contest when compared to the rest. I think that the "initial" 3 shot groups are a good means to seperate the junk so to speak without wasting time and components. Having made this initial selective test allows him to refine the rest with upcoming 5 shot sequences.

[Robmcleod82]

The only thing I would determine with those groups is the cci primers seemed more accurate than the federal. I would be inclined to think the flyers in the first 2 groups were operator related, or large cold bore shift, but again 3 shots don't speak much

[260 Rem]

I am a "repeat some five shot groups" advocate. Give it a try and you will likely observe there are some differences...and think it as your 3 shot group plus two. Once I get five to group, it is time to move on to multiple five shot groups with that spec load .. and once the proof is on paper, I am more comfortable with my expectations. I come into contact with a lot of shooters, and it is not uncommon to hear.... "I don't understand this, last week I shot a half inch group and today nothing is under an inch, do think its the wind?".
Also, I define a "flier" as a phenomenon that is likely related to load .. once you accept that and look for the cause, the path to repeat shot accuracy gets a bit shorter.

[Robmcleod82]

260, not trying to be a pain, the info you've just relayed is good and will help some members for sure. I do believe old Chuck has a good handle on reloading

[Dean2]

Originally Posted by chuck

Interesting.

The seating depth makes perfect sense and I have seen similar and even radically larger differences, but I have to say none of the primer tests I have tried came anywhere close to as big a change as yours are showing. I am definitely going to try primer testing again on some of my well established long term hunting loads. Good info, thanks for posting it.

[260 Rem]

Originally Posted by Robmcleod82

Sorry chuck I can't really agree that you have proved anything yet, a single 3 shot group for each condition doesn't give enough of a base to make much of a decision. Need more groups man

I probably just need to pay more attention, the OP referred only to a "study" which should never be confused with drawing a conclusion ... Especially when based on a couple of three shot groups. Like you, I wouldn't declare I had found the sweet spot based on three shots.
Confession time .... Back in the day, I was happy to base my aggs on three shot groups, but I eventually gave up on that as I found I learned a lot more from five shot groups.

[tchardy1972]

I think the 3.736" loads look to be about the best with both primers. The one with the federal primer is completely flat which tells me chuck may not have been holding his tongue just right. The first group with the federal primer looks better bit is near straight vertical which will show up a lot more at further than 100 yards. Just my interpretation.

[Rman]

Thinking some rounds over a quality chronograph would give better information than three and five shot groups a 100 yards.
Also, knowing Chuck...he already knows this as well.

Nothing quite like asking questions one already knows the answers to...but then again...he never really did ask a question...did you, Chuck?

R.

[twofifty]

Chuck didn't ask a question.
He dug a pit in the middle of the trail and spread some brush cover over the top.

Three have fallen in so far.

[Pathfinder76]

Originally Posted by Rman

Thinking some rounds over a quality chronograph would give better information than three and five shot groups a 100 yards.
Also, knowing Chuck...he already knows this as well.

Nothing quite like asking questions one already knows the answers to...but then again...he never really did ask a question...did you, Chuck?

R.

I've put just over 300 rounds through that particular barrel since Christmas. Many through a chronograph. On Saturday I was shooting in conditions that would have sent your "quality chronograph" into the next county.

Question: How does someone shoot groups in the 1's in wind that is blowing 90km/hr?

Answer: By knowing what the heck he is doing.

[Rman]

Originally Posted by chuck

I've put just over 300 rounds through that particular barrel since Christmas. Many through a chronograph. On Saturday I was shooting in conditions that would have sent your "quality chronograph" into the next county.

Question: How does someone shoot groups in the 1's in wind that is blowing 90km/hr?

Answer: By knowing what the heck he is doing.

Oh Chuck! Too priceless! Over 300 rounds, and still haven't got load development done? Nice...lots of doing...little of knowing?
My quality chronograph is not affected by conditions...any of them...You'd know this, if you knew what the heck you were doing!!!

Carry on with your trapping! You were doing so well!

R.

[Bushrat]

Originally Posted by chuck

Question: How does someone shoot groups in the 1's in wind that is blowing 90km/hr?

Answer: By knowing what the heck he is doing.

Whoever he is he should be shooting at the Supershoot, the Nationals and the Worlds, :

[Pathfinder76]

Originally Posted by Rman

Oh Chuck! Too priceless! Over 300 rounds, and still haven't got load development done? Nice...lots of doing...little of knowing?
My quality chronograph is not affected by conditions...any of them...You'd know this, if you knew what the heck you were doing!!!

Carry on with your trapping! You were doing so well!

R.

I know that is hard for someone that shoots 50 rounds a year to wrap their head around.

[Rman]

Originally Posted by chuck

I know that is hard for someone that shoots 50 rounds a year to wrap their head around.

You have no clue how many rounds a year I shoot, much less a clue about any thing else...but, its a good bit more than 50.

Hope that helps!

R.

[260 Rem]

Great, the real Chuck is back....I thought someone must have hacked his account I was a bit suspicious as I recall chuck saying that he never shot at paper.

[marxman]

thats awesome. what is it?

[Bushrat]

I just wanna see pics of these groups that are in the 1's.

[marxman]

Originally Posted by Bushrat

I just wanna see pics of these groups that are in the 1's.

isnt that whats in the picture? maybe its not about seating depth its about 90 km winds. gotcha! i think

[elkhunter11]

I just wanna see pics of these groups that are in the 1's.

It appears that he means 1", not .1".