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

Results of Crimp - 38 Spc

+2
chiz1180
lanjo
6 posters

Go down

Results of Crimp - 38 Spc Empty Results of Crimp - 38 Spc

Post by lanjo Sun Jan 21, 2024 4:29 pm

New to reloading.  Looking to optimize a 38 Spc load for a M52.  Tested several powders with increasing loads.  Settled on BE at 2.9 gr.  I have a 1:10 twist Clark aftermarket barrel in the M52 and it seemed to group the faster loads better.

Next wanted to test crimp.  Here are the results...

50 Yards - Ransom Rest
2.9 BE, 148 gr Zero WCHB, Starline brass

No crimp - 0.375 - Group size 4.5 inches
Roll crimp - 0.365 - Group size 3.5 inches
Roll crimp - 0.360 - Group size 3.0 inches
Roll crimp - 0.355 - Group size 2.0 inches
Taper crimp - 0.363 - Group size 4.0 inches

I was shocked to see such a dramatic difference just from the crimp.

The 0.355 crimp is the tightest the Lee roll crimp die will go.  I think it will reduce case life from the wear on the case mouth, but the accuracy gain is really good.

Joe


Last edited by lanjo on Sat Jan 27, 2024 11:56 pm; edited 3 times in total

lanjo

Posts : 101
Join date : 2015-02-23
Location : Richmond, VA

chiz1180, sayracin, shanneba and jmoore like this post

Back to top Go down

Results of Crimp - 38 Spc Empty Re: Results of Crimp - 38 Spc

Post by chiz1180 Sun Jan 21, 2024 4:38 pm

Looks like you found a winner. Did you notice any difference on bullet yaw?
chiz1180
chiz1180

Posts : 1126
Join date : 2019-05-29
Location : Ohio

Back to top Go down

Results of Crimp - 38 Spc Empty Re: Results of Crimp - 38 Spc

Post by lanjo Sun Jan 21, 2024 4:55 pm

All the holes were round.  I think the installing the 1:10 twist barrel put an end to the bullet tipping.

lanjo

Posts : 101
Join date : 2015-02-23
Location : Richmond, VA

chiz1180 likes this post

Back to top Go down

Results of Crimp - 38 Spc Empty Re: Results of Crimp - 38 Spc

Post by S148 Mon Jan 22, 2024 10:53 am

Nice results. How many rounds in your group?  Thanks.

S148

Posts : 292
Join date : 2017-07-04

Back to top Go down

Results of Crimp - 38 Spc Empty Re: Results of Crimp - 38 Spc

Post by rich.tullo Mon Jan 22, 2024 6:28 pm

Interesting. I just loaded 50 rounds with a taper crimp. I had been loading a little proud of the case mouth with a light roll crimp , makes me think about roll crimping.
rich.tullo
rich.tullo

Posts : 1904
Join date : 2015-03-27

Back to top Go down

Results of Crimp - 38 Spc Empty Re: Results of Crimp - 38 Spc

Post by lanjo Tue Jan 23, 2024 2:18 am

These are 10 shot groups.

The taper crimp I think could have done better.  The problem was that the taper crimp die I have is not adjustable. I can't make the crimp tighter.  With the roll crimp die I can make is tighter to a point.

I really did not think crimp was such a big factor.  The no crimp rounds would not chamber easily.  So, they were a non-starter and just academic. So, you need at least some crimp, but I would not have guessed that the crimp with cut the group size in half. But clearly it does.

lanjo

Posts : 101
Join date : 2015-02-23
Location : Richmond, VA

jmoore likes this post

Back to top Go down

Results of Crimp - 38 Spc Empty Re: Results of Crimp - 38 Spc

Post by jwax Tue Jan 23, 2024 4:22 pm

Redding makes one-
Results of Crimp - 38 Spc Reddin11
jwax
jwax

Posts : 503
Join date : 2011-06-10
Location : Western NY

Back to top Go down

Results of Crimp - 38 Spc Empty Re: Results of Crimp - 38 Spc

Post by bruce martindale Tue Jan 23, 2024 6:09 pm

Nice! How do you measure roll crimp?

bruce martindale

Posts : 1562
Join date : 2011-07-29
Location : Upstate NY

https://www.bullseyeforum.net/t20747-feeling-center-a-10-bullsey

Back to top Go down

Results of Crimp - 38 Spc Empty Re: Results of Crimp - 38 Spc

Post by jwax Wed Jan 24, 2024 11:46 am

Under a low power microscope, I match my crimps to old Federal Red box wadcutters crimp.
Mine match the performance of those old rounds.
Never have got a grip on measuring crimp.
jwax
jwax

Posts : 503
Join date : 2011-06-10
Location : Western NY

jmoore likes this post

Back to top Go down

Results of Crimp - 38 Spc Empty Re: Results of Crimp - 38 Spc

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