Lowleft

I wondered the same thing last year so I loaded up 10 small primer cases and 10 large primer cases and chronoed them. The small primer cases had an average of about 10 fps faster. Since there was only a 10 fps difference I wouldn't be surprised if I did the test again and the large primer cases were faster.

Glock 34 Berry's 124 RN 3.9 titegroup 130 PF 147 RN 3.2 titegroup 130 PF Both loads at 1.150 COL I go up .1 grns for jackets bullets. Sent from my iPhone using Tapatalk

I have tested this and found no real difference between large and small primers using same bullet and powder charge.

I had the same problem when I went to a Nosler bullet. (had been loading plinker 55grn fmjbt). I use the dillon trimmer and was told I didn't need to chamfer the case mouth. I had no problems until I went to the longer bullet. I started chamfering the case mouth and I had no more problems. Can't say it's what's causing your problem but it worked for me.

I have 3 tool heads for 223 First tool head is only to deprime with lee universal deprime die. I then clean in SS tumbler. After brass is dry I run it through the dillon swager. Second tool head is resize die in first station and dillon rt1200 trimmer in third station. I just run it all through the trimmer. I then tumble lube off in corn cob and check all the cases with a dillon go-no go gauge. Third tool head, universal deprime in station one. Powder drop in station two. Seat in station three and crimp in station four.

I have the same problem with extreme 147's. It is just because the bullet goes into the vent hole. Won't hurt or cause any problems. It has been shown that having a uniform base is more important than the tip of the bullet. If you do a search you should be able to find the test some one did on the effects of base damage versus nose damage.

Ordered .223 die set on January 4th. Got the e-mail yesterday saying they were shipped. Should get them next Wednesday.

I couldn't tell any difference. But I was shooting from a rest which sometimes makes it a little harder to tell slight differences. What really amazed me was how consistent the velocity was using matched head stamps. I've always used mixed head stamps and never sorted by brand.

Ok. Finally got to test these. I loaded ten total. All Winchester brass, cci 500 primers, 4.6 grn VV N320 all charges weighed individually, OAL 1.250 variation of less than .003". I weighed out ten bullets that were within .2 grains of each other. Bullets were Bayou 230 RN. Test gun was a STI Sentry 5" 10 shot string. Low 731 high 786 avg 757. es 55 sd 15 First shot was 731 (i've noticed that the first shot is usually my lowest velocity, not sure why, maybe round is chambered differently than when gun cycles under fire, maybe because chamber is colder, maybe someone can answer this) 2. 760 3. 780 - large flash hole 4. 786 - large flash hole 5. 750 6. 750 7. 753 8. 762 9. 753 10. 748 Looks to me like there was a noticeable difference in velocity between the cases with the large flash hole. As you can see they were about 30 fps higher than the cases with the normal size flash hole. I inspected the cases after firing and couldn't see any sign of blow by around the primers. However these are light loads. I don't know what might have happened if I loaded these a little on the hot side. Hope this information helps someone. I had a lot of fun with this. This is part of the reason I enjoy reloading, it's also a learning experience.

Will do. Will probably be next weekend.

That's funny. LOL I've decided to load these 2 along with about 10 of the ones with normal size holes and then chrono to see if there is a noticeable difference. Probably won't be able to get to the range till the end of next week. I'll post my findings when I do.

Found 2 cases that the flash hole is about twice the size as normal. I was sorting some brass by head stamp and came across these 2. Both are winchester. Have about 3 hundred winchester cases and these are the only 2 like this. Anyone ever seen this. The one on the left is what all the others look like.

I am using 3.4 vvn320 and 3.2 tite group. My OAL is 1.55 + - .003. Out of a glock 34 the n320 chronos at low of around 900 fps and a high of around 950 which keeps me safely above the pf. If I go down just .1 grain my lowest gets down around 860 fps. Which is a little too close for me and I can't tell much difference in the recoil.

I use the Uniquetek tool head clamp kit. It does help with the OAL variations and also seems to make the machine operate smoother. The biggest factor I've found on OAL is the brass. If I use matching head stamps my OAL variance is around .003. If I use mixed head stamps the OAL varies by as much as .008. Before the clamp kit the OAL would vary about .006 using matching head stamps. I've also noticed that I get more variation with plated bullets than with jacketed. After extensive accuracy testing I have realized that I can't tell the difference in a .010 variation (not saying that someone else can't) As for chrono testing, there is about 10 fps avg difference that may or may not becaused by the .010 variation, but it does make me feel better knowing that they are the same length.

Welcome to the forum I reload 9mm, 45 and 223 on a Dillon 550. I like it a lot but I have considered upgrading to the 650 because of the powder check (easy to see powder in pistol cases not so easy to see in 223 cases). If your going to a match don't go to watch, go to shoot. Let the group you're shooting with know it's your first match and they will be glad to help you through the match and answer any questions you have.