Bullseye-L Forum
Would you like to react to this message? Create an account in a few clicks or log in to continue.

200 vs 180 .45 load

+6
Larry2520
James Hensler
Ghillieman
Wobbley
STEVE SAMELAK
bob finger
10 posters

Go down

200 vs 180 .45 load Empty 200 vs 180 .45 load

Post by bob finger Mon Jun 01, 2020 1:42 pm

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

bob finger

Posts : 68
Join date : 2016-08-07

Back to top Go down

200 vs 180 .45 load Empty Re: 200 vs 180 .45 load

Post by STEVE SAMELAK Mon Jun 01, 2020 2:02 pm

Yep  f=mxa.
Lighter bullet (same style) needs more a to get the same f to make the gun work.
STEVE SAMELAK
STEVE SAMELAK

Posts : 944
Join date : 2011-06-10

Back to top Go down

200 vs 180 .45 load Empty Re: 200 vs 180 .45 load

Post by Wobbley Mon Jun 01, 2020 2:14 pm

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.
Wobbley
Wobbley
Admin

Posts : 4650
Join date : 2015-02-13

Back to top Go down

200 vs 180 .45 load Empty Re: 200 vs 180 .45 load

Post by Ghillieman Fri Jun 19, 2020 11:31 am

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.
Ghillieman
Ghillieman

Posts : 468
Join date : 2012-02-15
Location : TEXAS

Back to top Go down

200 vs 180 .45 load Empty Re: 200 vs 180 .45 load

Post by James Hensler Fri Jun 19, 2020 12:01 pm

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
James Hensler
James Hensler

Posts : 1245
Join date : 2018-01-15
Age : 55
Location : Southwest Florida

Back to top Go down

200 vs 180 .45 load Empty Re: 200 vs 180 .45 load

Post by Larry2520 Sat Jun 20, 2020 10:14 pm

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 : 139
Join date : 2017-05-07

Back to top Go down

200 vs 180 .45 load Empty Re: 200 vs 180 .45 load

Post by rreid Mon Jun 22, 2020 12:57 am

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
rreid

Posts : 562
Join date : 2012-02-06

Back to top Go down

200 vs 180 .45 load Empty Re: 200 vs 180 .45 load

Post by Slamfire Tue Jun 23, 2020 8:50 pm

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 : 2016-04-19

Back to top Go down

200 vs 180 .45 load Empty Re: 200 vs 180 .45 load

Post by bpettet Thu Jun 25, 2020 9:19 am

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.

bpettet

Posts : 254
Join date : 2017-05-24
Location : Ft Worth, TX

http://www.stratos2.com

Back to top Go down

200 vs 180 .45 load Empty Re: 200 vs 180 .45 load

Post by David R Thu Jun 25, 2020 9:36 am

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
David R
David R

Posts : 408
Join date : 2018-12-10
Age : 63
Location : Hamlin NY

Back to top Go down

200 vs 180 .45 load Empty Re: 200 vs 180 .45 load

Post by Sponsored content


Sponsored content


Back to top Go down

Back to top

- Similar topics

 
Permissions in this forum:
You cannot reply to topics in this forum