+1 on the 21st Century Innovation primer pocket uniformer. It cuts the corners square and even’s up pockets after every firing.
The big primer seating debate
- Thread starter wywindsor
- Start date
6BRA
Gold $$ Contributor
And with uniformed pockets mine never varies on depth once you learn how to get to the CPS hardstop. I think alot of variance on the CPS comes from people thinking they are at hardstop when in actuality they have just touched bottom. Loving the RimLock so far myself. Zero variance.
My tool is set to.123” for BRA Lapua cases, and it definitely removes some of the brass flowing
I clean primer pockets after every firing and the brass in the picture below has nine firings on it and the pockets are as shiny as the day I uniformed them for the first time
Imagine the difference in primer pocket depth if you’re not cleaning and uniforming after every firing
For me the jury is still out on the Rimlock, I've been only using it for the first time priming my 300WSM cases, I get 2-3 thou of variation in final seating depth and the reason is different thickness of the rim and primers vary also
But I believe the amount of anvil crush is the same and that's what really matter IMO.
Plus the tool is clearly not removing too much brass and is just getting everything even, you can see this in your pic on the bottom row fourth from the right.
My case prep is done with five trimmers, the CH trimmer uses a false chamber, which allows me to flip the case and cut the base flat and square. After, I recut the primer pocket depth to a uniform depth on each case. Then the primers are bottom out set using an RCBS bench mounted priming tool at 100% pressure.
If you do a 100% prep on your amm, including sorting by water case capacity, you have eliminated the variables of the ammo. Same primers, same brass, same bullets, same seating depth and same water capacity. I do 500 pieces of brass at a time for my match brass. The match itself is not the end, it is any shoot off after the match.
If you do a 100% prep on your amm, including sorting by water case capacity, you have eliminated the variables of the ammo. Same primers, same brass, same bullets, same seating depth and same water capacity. I do 500 pieces of brass at a time for my match brass. The match itself is not the end, it is any shoot off after the match.
6BRA
Gold $$ Contributor
You aren't accounting for rim thickness or rim delection in the standard shell holder priming system. I used to have an rcbs with Hollands.
Dirty primer pockets primed with a long out of production round Lee Auto Prime hand primer. I dispensed the charges with a RCBS Chargemaster.
People have to do what makes them confident. I do too. I only post this stuff to show alternatives. I would hate to be a new reloader because it would be easy to come away with the idea that reloading has to be rocket science in order to achieve precision and accuracy.
People have to do what makes them confident. I do too. I only post this stuff to show alternatives. I would hate to be a new reloader because it would be easy to come away with the idea that reloading has to be rocket science in order to achieve precision and accuracy.
Attachments
Same deal here. Dirty pockets and dumping charges out of a chargemaster in between relays. 30BR this time at a group match at Chippewa Rifle Club.
There was a repeating right to left condition that I had figured out pretty good. I stuck the first four into a dot over the course of several minutes. That condition never came back and I spent the next couple minutes waiting for it to return while shooting sighters in the reverse condition until I felt I had it worked out. I waited until there was 15 seconds left and finished the group in the reverse. It is the bullet hole farthest to the left that opened the group up to a .218. Not my smallest group ever at 200, but I hung that target up on my wall because I have never been prouder of a 200 yard group that I shot in a match. There was a zero percent chance that a different priming methodology would have made any difference.
There was a repeating right to left condition that I had figured out pretty good. I stuck the first four into a dot over the course of several minutes. That condition never came back and I spent the next couple minutes waiting for it to return while shooting sighters in the reverse condition until I felt I had it worked out. I waited until there was 15 seconds left and finished the group in the reverse. It is the bullet hole farthest to the left that opened the group up to a .218. Not my smallest group ever at 200, but I hung that target up on my wall because I have never been prouder of a 200 yard group that I shot in a match. There was a zero percent chance that a different priming methodology would have made any difference.
Attachments
I sure hope the filter guy at the Quick Lube isn’t reading this thread.
jackieschmidt
Gold $$ Contributor
I certainly agree with this.
There are things that we get away with in Short Range that suddenly make a difference at the longer ranges.
Most of the uniforming of primer pockets, seating tension, and other items can and do affect SD and ES numbers.
In Short Range, all we care about is one bullet following the next one in the target. I have shot 10 shot sub .150 groups with my Rail Gun where the extreme spread was as much as 30 fps. That would be disastrous in a 1000 yard set up.
???How does this compare with the times people have loaded the SAME case over and over for a few groups? Can’t get more consistent flash hole depth than that. Same pocket dimensions.
That aspect is hardly talked about but, I do know a few that shoot a tight one
then head back to the loading bench with those same cases before the next
relay.
Yeah, Fuj, with all our sharp minds focused on reducing variables, I would expect a lot more systematic runs of 5-10 shots per case (reducing the effects of work-hardening, if any happens with necks tightly fitted to chambers...), done with seven different cases, THEN repeated with the seven different cases done over a series of strings using all seven cases per string. In sequence.
***
THEN with a known set of three good cases...sequentially alter something on the cases themselves forcing some variable to change. Like chamfering the flash holes at the interior web. What else could be systematically altered? Not sure that thinning case necks would reveal anything until the clearance gets ridiculous.
***
THEN with a known set of three good cases...sequentially alter something on the cases themselves forcing some variable to change. Like chamfering the flash holes at the interior web. What else could be systematically altered? Not sure that thinning case necks would reveal anything until the clearance gets ridiculous.
ELR LVR
Silver $$ Contributor
I have a couple years ago, with certain rifles, started lumping my tight group shooting brass together,
within Load Development, I have to figure
whatever causes small groups is good to note and try to repeat.
Upgrades & Donations
This Forum's expenses are primarily paid by member contributions. You can upgrade your Forum membership in seconds. Gold and Silver members get unlimited FREE classifieds for one year. Gold members can upload custom avatars.
Click Upgrade Membership Button ABOVE to get Gold or Silver Status.
You can also donate any amount, large or small, with the button below. Include your Forum Name in the PayPal Notes field.
To DONATE by CHECK, or make a recurring donation, CLICK HERE to learn how.
Click Upgrade Membership Button ABOVE to get Gold or Silver Status.
You can also donate any amount, large or small, with the button below. Include your Forum Name in the PayPal Notes field.
To DONATE by CHECK, or make a recurring donation, CLICK HERE to learn how.