Ok I built a 308 gas gun from lots of different parts. and it shoots match ammo great..well ok- 1MOA- sometimes less...now I am reloading for it and I am finding that the best groups are with LC match and LC brass, versus the Fedral match ammo which just gets ok groups..... is this common in gas guns cause of pressure? I am under the impression that the LC cases are thicker and therefore can withstand more pressure, or the case holds pressure better than the FC would? or am I way off base?
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Reloading for 308 gas gun? military brass vs reg
- Thread starter Manzgear
- Start date
Re: Reloading for 308 gas gun? military brass vs reg
The use of LC brass for me is about durability. Military brass is thicker, and can take more abuse from a gas gun. You will get good velocity with less powder. Hope this helps, JPG
The use of LC brass for me is about durability. Military brass is thicker, and can take more abuse from a gas gun. You will get good velocity with less powder. Hope this helps, JPG
Re: Reloading for 308 gas gun? military brass vs reg
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Manzgear</div><div class="ubbcode-body"> is this common in gas guns cause of pressure? I am under the impression that the LC cases are thicker and therefore can withstand more pressure, or the case holds pressure better than the FC would? or am I way off base? </div></div>
thicker cases will have less CC ( case capacity)then thinner ones , the more CC you have the less pressure your going to see. So thick cases = higher pressure ( or less CC is a better what to look at it)
do thicker cases contain more pressure then a thinner case ? yes i think they do, but , becuase of less CC , i think it would sort of cancel itself out.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Manzgear</div><div class="ubbcode-body"> is this common in gas guns cause of pressure? I am under the impression that the LC cases are thicker and therefore can withstand more pressure, or the case holds pressure better than the FC would? or am I way off base? </div></div>
thicker cases will have less CC ( case capacity)then thinner ones , the more CC you have the less pressure your going to see. So thick cases = higher pressure ( or less CC is a better what to look at it)
do thicker cases contain more pressure then a thinner case ? yes i think they do, but , becuase of less CC , i think it would sort of cancel itself out.
Re: Reloading for 308 gas gun? military brass vs reg
Ok I understand the case capacity thing- but have you guys seen better results with military brass out of gas guns? I know the possibilities are endless to what a specific gun may like. I am just wondering if this a trend that is seen a lot and now I need to make the investment in brass for my semi rifle and use the other for when I get my bolt gun made?
Ok I understand the case capacity thing- but have you guys seen better results with military brass out of gas guns? I know the possibilities are endless to what a specific gun may like. I am just wondering if this a trend that is seen a lot and now I need to make the investment in brass for my semi rifle and use the other for when I get my bolt gun made?
Re: Reloading for 308 gas gun? military brass vs reg
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: MALLARD</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Manzgear</div><div class="ubbcode-body"> is this common in gas guns cause of pressure? I am under the impression that the LC cases are thicker and therefore can withstand more pressure, or the case holds pressure better than the FC would? or am I way off base? </div></div>
thicker cases will have less CC ( case capacity)<span style="text-decoration: line-through">then</span> <span style="color: #CC0000">than</span> thinner ones , the more CC you have the less pressure <span style="text-decoration: line-through">your</span> <span style="color: #CC0000">you're</span> going to see. So thick cases = higher pressure ( or less CC is a better what to look at it)
do thicker cases contain more pressure then a thinner case ? yes i think they do, but , becuase of less CC , i think it would sort of cancel itself out. </div></div>
Sorry man, two bad ones in one sentence.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: MALLARD</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Manzgear</div><div class="ubbcode-body"> is this common in gas guns cause of pressure? I am under the impression that the LC cases are thicker and therefore can withstand more pressure, or the case holds pressure better than the FC would? or am I way off base? </div></div>
thicker cases will have less CC ( case capacity)<span style="text-decoration: line-through">then</span> <span style="color: #CC0000">than</span> thinner ones , the more CC you have the less pressure <span style="text-decoration: line-through">your</span> <span style="color: #CC0000">you're</span> going to see. So thick cases = higher pressure ( or less CC is a better what to look at it)
do thicker cases contain more pressure then a thinner case ? yes i think they do, but , becuase of less CC , i think it would sort of cancel itself out. </div></div>
Sorry man, two bad ones in one sentence.
Re: Reloading for 308 gas gun? military brass vs reg
It probably just likes your handloads better than whatever match ammo you are using.
It probably just likes your handloads better than whatever match ammo you are using.
Re: Reloading for 308 gas gun? military brass vs reg
well the targets I have shot with the same powder, primer, and cases are better with the LC match brass- then they are with the Fedral match cases.... so this is data I have collected. that the loads I make - shoot better out of the LC match brass then they do out of any of the other brass- be it FC, Win, and PMC...
well the targets I have shot with the same powder, primer, and cases are better with the LC match brass- then they are with the Fedral match cases.... so this is data I have collected. that the loads I make - shoot better out of the LC match brass then they do out of any of the other brass- be it FC, Win, and PMC...
Re: Reloading for 308 gas gun? military brass vs reg
This is all speculation, but it could be slightly more consistent or "harder" neck tension from the brass being harder.
Maybe.
You have them in your hands. Measure. Quantify. Weigh them and compare them. Get the fired-case water capacity. You might be surprised.
Same for the velocities. Less case capacity usually means higher speeds. My experience and QuickLOAD agree that the speed difference is small, but it's there and it's consistent. Harder "bullet pull" (which does NOT necessarily correspond with "neck tension" as sorta-measured here by how much smaller the necks are before and after seating...) also corresponds generally with slightly higher speeds.
Consistent velocity, on the other hand, as in a "low sd" on velocity variations, is often not that closely tied to accuracy. It *can* reduce vertical dispersion out there beyond 300, but there's little evidence that a velocity sd of less than 15 is any worse than one in the single digits.
Me, I've never seen much of an accuracy difference between LC, WCC, and commercial brass, in .308.
This is all speculation, but it could be slightly more consistent or "harder" neck tension from the brass being harder.
Maybe.
You have them in your hands. Measure. Quantify. Weigh them and compare them. Get the fired-case water capacity. You might be surprised.
Same for the velocities. Less case capacity usually means higher speeds. My experience and QuickLOAD agree that the speed difference is small, but it's there and it's consistent. Harder "bullet pull" (which does NOT necessarily correspond with "neck tension" as sorta-measured here by how much smaller the necks are before and after seating...) also corresponds generally with slightly higher speeds.
Consistent velocity, on the other hand, as in a "low sd" on velocity variations, is often not that closely tied to accuracy. It *can* reduce vertical dispersion out there beyond 300, but there's little evidence that a velocity sd of less than 15 is any worse than one in the single digits.
Me, I've never seen much of an accuracy difference between LC, WCC, and commercial brass, in .308.
Re: Reloading for 308 gas gun? military brass vs reg
GRump! thanks for the input, I really appreciate it. I did weigh the cases- one vs the other - those being LC match vs FC match and the LC was heavier by 2tenths of gram. but I have not filled them with water and weighed them. nor Have I heard of doing that. but there are some things that are still quite new to me. I have been shooting for a long time. since i was in 5th grade. I am 33- but loading only for 3 years and I would not say that I anywhere near an expert there. Hence I am here and willing to learn anything at anytime from all the great people on this forum. so thank you again and I hope this finds you all well...
GRump! thanks for the input, I really appreciate it. I did weigh the cases- one vs the other - those being LC match vs FC match and the LC was heavier by 2tenths of gram. but I have not filled them with water and weighed them. nor Have I heard of doing that. but there are some things that are still quite new to me. I have been shooting for a long time. since i was in 5th grade. I am 33- but loading only for 3 years and I would not say that I anywhere near an expert there. Hence I am here and willing to learn anything at anytime from all the great people on this forum. so thank you again and I hope this finds you all well...
