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< 16ga. Ammunition & Reloading ~ roll crimp - trim question |
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Posted:
Thu Sep 25, 2008 3:13 pm
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Joined: 28 Jan 2007
Posts: 129
Location: hong kong
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I have deceided to try some roll crimp loads. I have the BPI Multihulls, and my question is: Do I need to trim these hulls when loading 2 3/4 inch loads and using a roll crimp?
If triming is recommended, how much is left above the overshot card prior to rolling?
thanks, Ajax. |
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Posted:
Thu Sep 25, 2008 3:57 pm
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Member
Joined: 27 Jun 2005
Posts: 1545
Location: Michigan
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You only want about 3/16" of hull above the O.S.C.
If your using a drill press, with plastic hulls, lube the tool and go slow. You don't want to melt or fuse the plastic together. |
_________________ What one person receives without working for, another person must work for without receiving. |
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Posted:
Thu Sep 25, 2008 5:45 pm
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Member
Joined: 14 Sep 2006
Posts: 285
Location: Black hills of South Dakota
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The total length of the shell before crimping should be the 2 3/4" measurement, same as in folded crimps. That's the length that has to fit in the gun chamber. Rolled crimps generally allow a little more shell length to be used for shot capacity than folded crimps do. But the length of either type of finished cartridge will be less than 2 3/4". |
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Posted:
Thu Sep 25, 2008 6:35 pm
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A 2 9/16th roll crimped shell has about the same internal capacity as a folded crimp 2 3/4 inch shell so unless you want to use a bunch of filler it is easier to trim your hulls to 2 9/16th inches. You can use the same loading data as you would for a 2 3/4 folded crimp shell but MV and chamber pressure will be a bit less due to reduced resistance from the rolled crimp when the shell is fired. |
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Posted:
Thu Sep 25, 2008 8:44 pm
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Joined: 28 Jan 2007
Posts: 129
Location: hong kong
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Posted:
Fri Sep 26, 2008 3:11 am
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Member
Joined: 27 Jun 2005
Posts: 1545
Location: Michigan
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Golfswithwolves wrote: |
The total length of the shell before crimping should be the 2 3/4" measurement, same as in folded crimps. That's the length that has to fit in the gun chamber.
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That is just not true!
You can put any size shell you want in a 2-3/4" chamber gun, as long as it's not longer than 2-3/4" I have loaded shells as short as 2-3/8". |
_________________ What one person receives without working for, another person must work for without receiving. |
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Posted:
Fri Sep 26, 2008 8:33 am
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Member
Joined: 14 Sep 2006
Posts: 285
Location: Black hills of South Dakota
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Dave- Of course you're right; I expressed myself poorly I guess. Any length opened shell of 2 3/4" or less can be used in a 2 3/4" chamber. What I was trying to express was that the rolled-crimp shells did not need to be trimmed shorter than 2 3/4" (unless you want to make a shell that opens up shorter than this length) Thanks for keeping my words honest! |
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Posted:
Fri Sep 26, 2008 10:54 am
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Member
Joined: 27 Jun 2005
Posts: 1545
Location: Michigan
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My only concern is that if you use your normal load, for a 2-3/4" fold crimped hull, and try to roll crimp it. You'll be trying to roll crimp about 3/8" of hull. You might get away with it on a paper hull, but I think it will be tough on a plastic hull. I hate roll crimping plastic hulls anyway. Paper works so much better. |
_________________ What one person receives without working for, another person must work for without receiving. |
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Posted:
Fri Sep 26, 2008 11:01 am
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Joined: 19 Feb 2008
Posts: 443
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Dave Miles is correct. Just for fun I once loaded up some 3/4 ounce loads in 2" hulls and then roll-crimped them. You should have seen the looks I got at the gun club.
sv |
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Posted:
Fri Sep 26, 2008 12:02 pm
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Member
Joined: 02 Oct 2007
Posts: 1975
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Steve,
What are you using for your 3/4oz load? I have some hulls that I am thinking about roll crimping. They were miistakes I made and I cut the hulls to get out the shot. They are BP hulls. I did not make the first cut to straigt, but there is enough left for 2 inches. |
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Posted:
Fri Sep 26, 2008 2:05 pm
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Dave Miles wrote: |
My only concern is that if you use your normal load, for a 2-3/4" fold crimped hull, and try to roll crimp it. You'll be trying to roll crimp about 3/8" of hull. You might get away with it on a paper hull, but I think it will be tough on a plastic hull. I hate roll crimping plastic hulls anyway. Paper works so much better.
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I find that 3/8ths inch is just about optimal for roll crimping plastic hulls. Plenty of room for the case mouth to turn over and seal the over shot card.
I agree that paper is a much better hull to roll crimp but I have learned to make due with those dreaded plastic hulls. Now if someone could come up with an aerosol spray that smelled like a newly fired Remington Express paper shell on a cold Autumn morning. |
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Posted:
Fri Sep 26, 2008 2:13 pm
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Joined: 19 Feb 2008
Posts: 443
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I used a modification of my standard load. 15.5 gr of GD, some old BP plastic gas seals I had laying around, a cork filler wad, and an overshot card in a severely cut down Federal hull. They seemed close to my usual 1217 fps.
I sent some of them to Wisconsin & Steve Grozik killed a ruff and several woodcock with them using #8 shot. He saved the rest of them saying they were too cute to shoot.
sv |
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Posted:
Fri Sep 26, 2008 2:28 pm
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Member
Joined: 17 Feb 2007
Posts: 497
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Give some of those to Tiny, Steve |
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Posted:
Fri Sep 26, 2008 2:43 pm
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Joined: 19 Feb 2008
Posts: 443
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postoak wrote: |
Give some of those to Tiny, Steve
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I already hooked Tiny up with the regular 3/4 load in 2.5" hulls. He LOVES them.
sv |
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