jo191145 said::-\
Are your measurements walking?
Well I'm trying to be as accurate as possible. I've got a really good caliper.
Is the die tight?
Yes I believe so.
SMK's can be pretty rough. Folks who use them tend to sort by length and they usually shoot best with a jump to the lands. Personally I feel thats because of the built in discrepancies among other things. JMO
But if its seating off the ogive and I'm measuring off the ogive how can an individual bullet change it?
Scenars are at the other end of the spectrum. They're so darn pointy many seating plugs seat them from the tip. You'd need to check your seating plug to determine if it needs to be drilled deeper. I had to do just that on a Hornady 308W seater for the Scenars.
I'm doing better with these.
How much variation are you seeing in your measurements?
.003 +/-
jo191145 said:In reality the seater does not seat off the ogive. It would damage the bullet attempting it. In reality your comparator is not measuring off the ogive either but probably closer to it than the seater.
So its possible theres a littlle variation right there.
But I set the die to my comparator?
I never like to see more than .001" difference in bullet measurements. Usually thats what I get with no troubleshooting.
If they're SMK's you can expect a tad more.
If you haven't already, pull that seater apart. Clean out the packing grease.
I'll try that tomorrow.
Check the seater plug on your Scenars. Lightly insert one and see if theres any wiggle (you need to look close, feel is probably better) Try a few.
Upon visual inspection I determined my plug ended too abruptly. I drilled it deeper with an 1/8" drill to allow the tip of the Scenar a void.
"Maybe" thats what your seeing. Never used a Forster die or press.
in2deep said:If the intent is to check the distance from base to ogive in order to seat the bullet at the same place in the rifling each time it seems like our tools (comparators) don't even measure near the area of interest? Maybe we need better comparator inserts that measure lower on the bullet closer to the ogive.
Also have you checked your tools/technique to see what kind of error you are getting in the measurement repeatadly checking the same bullet and averaging it out could be you have .0015 to start out with.? Switching to the stainless sinclair insert over my prior aluminum inserts increased my accuracy by almost .001 combined with a little technique someone shared about twisting the case in the comparator to get better repeatability.
I had the same problem with the same brand Joe.jo191145 said::-\
Are your measurements walking?
Is the die tight?
SMK's can be pretty rough. Folks who use them tend to sort by length and they usually shoot best with a jump to the lands. Personally I feel thats because of the built in discrepancies among other things. JMO
Scenars are at the other end of the spectrum. They're so darn pointy many seating plugs seat them from the tip. You'd need to check your seating plug to determine if it needs to be drilled deeper. I had to do just that on a Hornady 308W seater for the Scenars.
How much variation are you seeing in your measurements?
thefitter said:Thanks
Disclaimer: I'm not a BR guy but I come here often to learn.
REM 700 SPS TAC .308
Yes I trim to length. Forster press and Forster Micrometer seating die. I'm measuring at the ogive.
Bullets are SMK in 168 and 175. I just started playing with 155 Scenars and it seems that these have less discrepancies. I understand that there are discrepancies in the bullets but if the die is seating off the ogive and the base and I'm measuring off the ogive and the base why does it start to walk after 4-5 rounds?
bozo699 said:TC,
OCD? and what do you mean the die lock nut shouldn't be tight? Is that something special to coax presses or coax dies?
Wayne.
bozo699 said:TC,
I got it now,thanks.
I have had OCD for years ??? is there a cure? LOL
Wayne.