Deavis
Member
Having some trouble getting the OAL of my 223 rifle rounds to be consistent. I know why I don't like loading rifle as much as pistol!
Here is what I'm doing.
Trim Setup on a 650XL using Uniquetek's toolhead clamps-
Redding Full Size (to size with max leverage)
Dillon trim Die + 1200 (just to trim in station 3)
Measuring 45 rounds targeting 1.750" I find the following:
1.7508 average length
.0008 stdev in length
.0035 max variation (1.7490" max - 1.7525" min)
So, the trim is generally within a thousandth statistically and a maximum difference of .0035". That seems like that is an acceptable difference given that the resolution I can measure to is 0.0005". All brass is the same headstamp but I tried with some LC and the few I measured were within the max variation as well. I think the trim setup is ok.
Rest of the brass prep (tumble, chamfer, etc) is done. Then I start loading and the problems begin. I checked the rounds before loading and the last prep does not change the above results as one would expect.
Load Setup on the same 650XL with a clamped toolhead
Lee Decapping (flash hole junk)
Dillon powder drop
Redding Competition Seater
Redding Crimp die
I get the following results for my loades (10 random selections)
2.2354" average
0.0259" Stdev
0.0800" max variation
That is unacceptable I think, but when I measure some factory winchester rounds I get this
2.2346" average
0.0297" Stdev
0.1050" max variation
So, the loads are slightly less variable than factory loads but not much. That seems odd to me since I have read about people claiming to load to wqithin 0.001" OAL consistently. So I measured the bullets (Win 55gr FMJs). Here are the results:
0.7415" Avg length
0.0051" stdev
0.0195" max varaiation
Okay, well, the bullets aren't exactly as good in variation as my trim. My understanding was that the Competition seating die would help remove variation but, if anything, the variation in loaded rounds is higher than bullet variation and significantly so. The dies are tight, the seating die is setup per Redding's instructions (compress sleeve, back-off till numbers are on the front, which was 1/8 turn for me). Trim die doesn't influence it (removed it). For kicks I tried flaring the neck with an M-Die but that doesn't change things either. I haven't tried going back to an unclamped toolhead yet but given how well the trim turned out, I'm not inclined to think that is the issue.
Any ideas? The only thing I can think is that the combination of the bullet variation and the seating die are giving me problems but the REdding die is supposed to be the cat's meow. Hmmm...
Here is what I'm doing.
Trim Setup on a 650XL using Uniquetek's toolhead clamps-
Redding Full Size (to size with max leverage)
Dillon trim Die + 1200 (just to trim in station 3)
Measuring 45 rounds targeting 1.750" I find the following:
1.7508 average length
.0008 stdev in length
.0035 max variation (1.7490" max - 1.7525" min)
So, the trim is generally within a thousandth statistically and a maximum difference of .0035". That seems like that is an acceptable difference given that the resolution I can measure to is 0.0005". All brass is the same headstamp but I tried with some LC and the few I measured were within the max variation as well. I think the trim setup is ok.
Rest of the brass prep (tumble, chamfer, etc) is done. Then I start loading and the problems begin. I checked the rounds before loading and the last prep does not change the above results as one would expect.
Load Setup on the same 650XL with a clamped toolhead
Lee Decapping (flash hole junk)
Dillon powder drop
Redding Competition Seater
Redding Crimp die
I get the following results for my loades (10 random selections)
2.2354" average
0.0259" Stdev
0.0800" max variation
That is unacceptable I think, but when I measure some factory winchester rounds I get this
2.2346" average
0.0297" Stdev
0.1050" max variation
So, the loads are slightly less variable than factory loads but not much. That seems odd to me since I have read about people claiming to load to wqithin 0.001" OAL consistently. So I measured the bullets (Win 55gr FMJs). Here are the results:
0.7415" Avg length
0.0051" stdev
0.0195" max varaiation
Okay, well, the bullets aren't exactly as good in variation as my trim. My understanding was that the Competition seating die would help remove variation but, if anything, the variation in loaded rounds is higher than bullet variation and significantly so. The dies are tight, the seating die is setup per Redding's instructions (compress sleeve, back-off till numbers are on the front, which was 1/8 turn for me). Trim die doesn't influence it (removed it). For kicks I tried flaring the neck with an M-Die but that doesn't change things either. I haven't tried going back to an unclamped toolhead yet but given how well the trim turned out, I'm not inclined to think that is the issue.
Any ideas? The only thing I can think is that the combination of the bullet variation and the seating die are giving me problems but the REdding die is supposed to be the cat's meow. Hmmm...