200 vs 180 .45 load
+6
Larry2520
James Hensler
Ghillieman
Wobbley
STEVE SAMELAK
bob finger
10 posters
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200 vs 180 .45 load
A minor dilemma has appeared. I normally use 200 G SWC (Brazos) above 3.6 grains of Bullseye. Both my guns are tuned for this load. I today tried some 180 G SWC (again Brazos) with the same 3.6 of BE. Shoot well but it is obvious I need a bit more ooomph to allow slides to function as I like. Just a few more facts. Gun 1. is a 1911 with 12 pound recoil spring. Gun 2. is a Smith 745 with "light" recoil spring.
Is this to be expected? I'm going to make some up with 3.8 and 4.0 of BE. Won't be able to shoot them for a couple of days.
Any thoughts or suggestions? Thanks in advance. bob
Is this to be expected? I'm going to make some up with 3.8 and 4.0 of BE. Won't be able to shoot them for a couple of days.
Any thoughts or suggestions? Thanks in advance. bob
bob finger- Posts : 68
Join date : 2016-08-07
Re: 200 vs 180 .45 load
Yep f=mxa.
Lighter bullet (same style) needs more a to get the same f to make the gun work.
Lighter bullet (same style) needs more a to get the same f to make the gun work.
STEVE SAMELAK- Posts : 960
Join date : 2011-06-10
Re: 200 vs 180 .45 load
Steve is on the right track, but it’s momentum which is mass times velocity.
For 3.8 BE my velocity was 700.... so.. 200x700 has to equal 180 x V?
Doing the math, V? Comes out to be around 780. That would need at least 4.2 BE. So try that.. I’d bracket it for 4.0 to 4.5.
And in my 745 with the light spring 3.8 was problematic but 4.0 to 4.2 functioned ok with 200s.
For 3.8 BE my velocity was 700.... so.. 200x700 has to equal 180 x V?
Doing the math, V? Comes out to be around 780. That would need at least 4.2 BE. So try that.. I’d bracket it for 4.0 to 4.5.
And in my 745 with the light spring 3.8 was problematic but 4.0 to 4.2 functioned ok with 200s.
Wobbley- Admin
- Posts : 4826
Join date : 2015-02-13
Re: 200 vs 180 .45 load
Yes, you will need more powder for a lighter bullet to operate the same slide and spring weight.
Sometimes a tighter crimp will increase pressure without increasing powder charge.
I'm using Brazos 180 flat base with 4.7 titegroup and a slide mounted 9000sc, 13 pound recoil spring. Still less felt recoil than the Brazos 200 swc with 4.3 titegroup.
Sometimes a tighter crimp will increase pressure without increasing powder charge.
I'm using Brazos 180 flat base with 4.7 titegroup and a slide mounted 9000sc, 13 pound recoil spring. Still less felt recoil than the Brazos 200 swc with 4.3 titegroup.
Ghillieman- Posts : 468
Join date : 2012-02-14
Location : TEXAS
Re: 200 vs 180 .45 load
For what’s its worth I shoot 200 SWC and 185 JHP for matches
200 SWC 3.8 of N310
185 JHP 4.5 of N310
200 SWC 3.8 of N310
185 JHP 4.5 of N310
James Hensler- Posts : 1245
Join date : 2018-01-15
Age : 55
Location : Southwest Florida
Re: 200 vs 180 .45 load
For what it's worth I use a 10 pound spring and it works for 184 or 200 grain loads with 3.8 of bullseye. However use a buffer on your spring guide and not the black kind.
Larry2520- Posts : 143
Join date : 2017-05-07
Re: 200 vs 180 .45 load
The 180 doesn't seat as far into the case as the 200, either. So you will have a larger volume inside the case with the same amount of powder and get lower pressure. Just increase the powder charge .1 or .2 with the 180s.
rreid- Posts : 562
Join date : 2012-02-06
Re: 200 vs 180 .45 load
I am running 4.0 grains Bullseye with a 200 LSWC, in cold weather, 4.1 grs. My buds shooting 185 grain bullets are all running a tenth of a grain more Bullseye than I am.
Slamfire- Posts : 224
Join date : 2016-04-18
Re: 200 vs 180 .45 load
I'm running 3.8 BE with 200 gr Brazos and 12# spring with a Primary Arms slide mounted optic. I could probably drop the spring rate a bit but it's working fine and is accurate. I tried 4.0 BE and it kicked the brass way out.
Re: 200 vs 180 .45 load
Federal Gold Medal Match is a 185 FMC SWC. It goes about 775 fps. I try to match that.
It takes 4.5 bullseye or 4.7 WST.
David
It takes 4.5 bullseye or 4.7 WST.
David
David R- Posts : 408
Join date : 2018-12-10
Age : 64
Location : Hamlin NY
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