cruze82 wrote:Why this rifle went into the gunsmith was in the run in process I noticed the feed ramp was leaving chatter marks in the projectile so I wanted the feed ramp polished and the chamber mouth chamfered
cruze82 wrote:The thing I am unsure of is for initial load development (incremental powder charges) to find desired velocity and accuracy node is should I seat all rounds 0.010 back of the lands to start?
Or should I seat them jammed in the lands so as any future fine tuning seating deeper only results in lower pressure not higher?
I have searched the net but cant seem to find a definitive answer any help would be much appreciated guys.
cruze82 wrote:Primer - CCI BR2
Tiiger wrote:cruze82 wrote:The thing I am unsure of is for initial load development (incremental powder charges) to find desired velocity and accuracy node is should I seat all rounds 0.010 back of the lands to start?
Or should I seat them jammed in the lands so as any future fine tuning seating deeper only results in lower pressure not higher?
I have searched the net but cant seem to find a definitive answer any help would be much appreciated guys.
A definitive answer... Same old in shooting where everyone has an opinion proven to them, but not much anywhere. I don't think anyone can give you a "This is best because of unquestionable proof shown here".
For what it's worth, my 2c are:
As you obviously know seating 'just off the lands' is widely found to give the best result. Let's call it 0.010 like you said.
Given that's most likely to give the best result - or close to it - and remove 1 factor in inaccuracy, I always seat mine the 0.010 off and focus on power charges.
Of course it's not a 100% guarantee that it will be best, but I'd calling it playing the odds.
Once you've found the best charge revisit the seating depth as required.
Setting the depth lower at the initial stage seems a bit like inviting it to be less accurate which isn't going to help.
Just my humble opinion.
cruze82 wrote:Thanks Tiiger for the info this topic sat stale with no answers for awhile
cruze82 wrote:The results for the Magnetospeed were there was NO POI change or change in group size despite what the LGS had told me when I was sold the item
squirrelhunter wrote:Sorry to give myself a bump here...
Cruze, any ideas on my question about the chattering above?
Or anyone else with ideas welcome too
bigfellascott wrote:So how did you find the Magnaspeed, easy to set up and use?
cruze82 wrote:mine had no obvious burs but the chatter marks were caused by the top of the feed ramp and the chamber mouth not having a broken or chamfered edge
cruze82 wrote:The only down side is now a few of the guys at the club have seen it and how well it works there has been a few "would you mind if I borrow that"