Switching Brass/ POI difference?

[CleanMoostang]

So the Hornady brass I have been using has about 5 loads through all of them, and I am expecting wear and tear to start showing real soon. Now, for my other brass, i have about 300 once fired FGMM brass thats in great condition.

For my question: once I start switching over to these with the same load (powder, depth, coal) will I notice a change in my POI and my 100yd zero?

 

[antagonist]

Re: Switching Brass/ POI difference?

Change anything and you should expect something different. There might be a difference in case capacity and neck tension that could definitely change the pressure and POI. It's usually smart when changing any component to start low on the powder and work back up. If you have a chrono, you can work back up to the same velocity and other than a slight change in zero, your dope should remain relatively unchanged.

 

[Beef82]

Re: Switching Brass/ POI difference?

I have't seen any appreciable difference between Hornady, Remington, and Nosler .308 brass when all else remained the same, but that's certainy not to say there couldn't be one with other combinations. My go to loads also aren't max pressure.

 

[CleanMoostang]

Re: Switching Brass/ POI difference?

Well according to my reloading manual, which is a little older...

But my max for reloader 15 is 45gr and I am currently at 44. So not exactly maxed out yet.

 

[turbo54]

Re: Switching Brass/ POI difference?

Not a textbook answer, but I'd just dump 44gr RE15 in the new brass and let it rip. Chances are you'll have minimal POI change.

The textbook answer, however, is to drop 10% and do a new load workup.

 

[High Binder]

Re: Switching Brass/ POI difference?

I'm pretty sure FMGG is NATO brass (look for the star inside a circle) which means it'll have less capacity than the non-NATO Horn brass. If that's the case you'll have to down-load the FGMM brass by about 10% otherwise you might see pressure signs and will see a change in POI for sure.

 

[Tripwire]

Re: Switching Brass/ POI difference?

Pretty common question from rookie reloaders these days and absolute proof positive that rookie reloaders do not understand the basics of reloading.

Don't be a rookie reloader that doesn't understand the basics..........

 

[CleanMoostang]

Re: Switching Brass/ POI difference?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Tripwire</div><div class="ubbcode-body">Pretty common question from rookie reloaders these days and absolute proof positive that rookie reloaders do not understand the basics of reloading.

Don't be a rookie reloader that doesn't understand the basics.......... </div></div>

(ETA: lol nevermind, read some of your other posts, trolling on hopes of top 10 monthly posters...good luck.

Uninformative and taken with a grain of salt, thank you.

BTW, I know a little about reloading...just a little...

 

[CleanMoostang]

Re: Switching Brass/ POI difference?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: High Binder</div><div class="ubbcode-body">I'm pretty sure FMGG is NATO brass (look for the star inside a circle) which means it'll have less capacity than the non-NATO Horn brass. If that's the case you'll have to down-load the FGMM brass by about 10% otherwise you might see pressure signs and will see a change in POI for sure. </div></div>

Just checked HB and unless the guy who donated the brass to me was mistaken, this either is not nato, or not fgmm. Its only labeled F C 308 WIN.... eta this photo is from another thread, and guy is saying its fgmm... but its just like mine.

 

[Tripwire]

Re: Switching Brass/ POI difference?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: CleanMoostang</div><div class="ubbcode-body">

(ETA: lol nevermind, read some of your other posts, trolling on hopes of top 10 monthly posters...good luck.

</div></div>

Look at my join date Einstien......I'm anything but a top poster for post count.

Instead of worrying about what I post why don't you search your own question and see the blue million times its already been asked.....ad nauseum.

And gleans the same answers you are getting here..........

You're obviously a knowitall who stomps in here with a question about breaking a cardinal rule that the old salts won't break and don't like the answer you get.

Rookies...........

 

[High Binder]

Re: Switching Brass/ POI difference?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: CleanMoostang</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: High Binder</div><div class="ubbcode-body">I'm pretty sure FMGG is NATO brass (look for the star inside a circle) which means it'll have less capacity than the non-NATO Horn brass. If that's the case you'll have to down-load the FGMM brass by about 10% otherwise you might see pressure signs and will see a change in POI for sure. </div></div>

Just checked HB and unless the guy who donated the brass to me was mistaken, this either is not nato, or not fgmm. Its only labeled F C 308 WIN.... eta this photo is from another thread, and guy is saying its fgmm... but its just like mine.

</div></div>

Yeah, that's not NATO so your loads are going to be VERY close if not dead on. If it's NATO it'll have a little circle with a star (looks like a + sign). NATO brass has a much thicker web so the capacity is down and it develops the same pressures with less powder which is why you have to down load by 10%. You should be just fine but you should still download a batch and shoot them just to be on the safe side. There are other factors involved too so keep an eye on everything.

 

[Unknown]

Re: Switching Brass/ POI difference?

I have only had one instance where changing a component hasn't made a difference. Some of my Federal GMM (308) brass, and the military brass both shoot the same load to the same point of impact. I weighed the cases, and they weigh the same, so I guess that is probably part of the reason why...

 

[gunsnjeeps]

Re: Switching Brass/ POI difference?

Let's see. In 5.56, changed from PMC to Lake City moved POI 3 inches right at 100 yards. (same velocity, same group size)

7.62 x 51 changed from Lake City LR to CAVIM (Venezulan ball) lost 150 fps don't have measurement on change for this one since I was chronoing loads.

A friend of mine shoots F-Class and has had POI changes from different primer lots.

 

[CleanMoostang]

Re: Switching Brass/ POI difference?

Thanks guys for the input, going to test these vs the dope of my hornady batches this week. Probably wont go past 600 yards but just want to see any major differences.

Thanks again~!

 

[halon101]

Re: Switching Brass/ POI difference?

i got a 50fps difference between batches of rem brass and win brass.

same charge same OAL same primer.

 

[George63]

Re: Switching Brass/ POI difference?

I have seen .223 brass that weighed 65 gr and 117 gr - those would not hold poi with the same load