Do these cases looked trimmed appropriately?

[Cult Hero]

I just picked up a rcbs power trimmer with a three way trimmer but it had no instructions.

I have set my length for 2.23 at 1.75 and believe I am getting a good cut but wanted some more experienced eyes to take a look.

I am also seeing variance in OAL of 1.748 to 1.753 with the trimmer. Seems with some cartridges no matter how long I leave them on the trimmer they just don't get any shorter. I know "acceptable" range is supposed to be 1.74 - 1.76 but is there any benefit to bringing them down to closer tolerance or should I focus more on COAL?

This is how they were coming out without the three way trimmer



With the addition of the three way



Final product.

[CSACANNONEER]

They will be fine for plinking rounds. For precision rounds, you might want to get them closer but, that will come with experience. If you're not worried about shooting sub moa, you'll never notice the difference.

[bsumoba]

They look good.

It could be the picture, but for the deburring, you only want to knock off the burrs, not taper it down to a thin edge. I would have less of a chamfer on the outside rim.

This could also just be the picture, but those rounds look setback in the brass pretty deep. What bullet is that and what is your OAL (overall length of the round, measured bullet tip to catridge base)?

[Cult Hero]

They look good.

It could be the picture, but for the deburring, you only want to knock off the burrs, not taper it down to a thin edge. I would have less of a chamfer on the outside rim.

This could also just be the picture, but those rounds look setback in the brass pretty deep. What bullet is that and what is your OAL (overall length of the round, measured bullet tip to catridge base)?

They are set back pretty deep as they are long. They are Hornady 75 gr Molys. My tip to tip OAL is 2.25. I checked them against a factory round and then in my PMAG's and they barely fit as it is. Can't imagine any longer unfortunately.

Unless I am missing something. First time loader.

[Germz]

They look questionable. you should send them to me for proper disposal.

[MR_X]

Yeah you missed something.

Yeah your OAL is way too short. According to Hornady manual the OAL should be no less than 2.390 and it states that they have to be single shot loading. Meaning that obviously they don't fit the magazine. You need to pay attention to your manual or you are taking a huge risk.

Look for the instruction here if you need them.

http://www.rcbs.com/resources/#product_instructions

[Cult Hero]

Yeah you missed something.

Yeah your OAL is way too short. According to Hornady manual the OAL should be no less than 2.390 and it states that they have to be single shot loading. Meaning that obviously they don't fit the magazine. You need to pay attention to your manual or you are taking a huge risk.

Look for the instruction here if you need them.

http://www.rcbs.com/resources/#product_instructions

Dang, I should have known! So these are not going to be a good AR bullet then. Do I need to pull the round and start over?

[Cult Hero]

looks like I should have done some more homework. These are single shot only. Will be getting a bullet puller I guess and using these in my bolt gun.

I guess that is why it is called learning.

http://www.ar15.com/forums/t_6_42/367702_Load_Data_for_75gr_Hornady_A_Max.html

[FormerBiker]

Dang, I should have known! So these are not going to be a good AR bullet then. Do I need to pull the round and start over?

It might be a good idea. You need to check the loading tables for the specific powder and projectile you are using. Keep in mind that different powders will have different burn rates. Kind of like different octanes in gasoline will burn at a different rate.

Seating the bullet too low (shorter oal) will be like increasing the compression in a car engine only worse with excessive pressures creating a dangerous condition.

ALWAYS RTFM! (Read the Freakin' Manual.)

[dung8604]

Dang, I should have known! So these are not going to be a good AR bullet then. Do I need to pull the round and start over?

Probably. Based on how much powder you used, you are at high risk of an over pressure condition.

You should pull them and start over, just to be safe. Assuming you went by the book, you can use the same powder charge, just make sure you seat to the proper length. After verifying there are no issues with that set up, you can slowly work the bullet back until it feeds in the magazine, checking for pressure signs with each reduction in length.

Sent from my Nexus 4 using Tapatalk

[Cult Hero]

cool. Thanks everyone. I used 21 grains of IMR 4064 which was the minimum.

[FormerBiker]

BTW your brass lengths are fine. I cut mine to 1.750 on a Hornaday manual trimmer.

[mark501w]

If that load is a beginning load(21gr IMR4064) your probably OK . My Pmags are short. Why don't you go shooting & have some fun?

[Cult Hero]

yes, beginning load. I don't want an overpressure situation. I don't know enough to make knowledgeable decisions so prefer to be overly cautious.

[mark501w]

It's good to be safe. My P mags are short I haven't changed my loads powder wise because of pushing the projectile deeper. I also don't load to the ragged edge. If your concerned about the powder weight check other reloading sources. Your doing fine go shooting.