MEC Sizemaster problem

loademwell · May 16, 2014, 11:27 AM

I cant seem to adjust this thing right. On the final crimp it deeps crushing the shell.... How on earth do you make it not do that?

rg1 · May 16, 2014, 02:29 PM

Just a couple tips and may help? Use a powder that doesn't take up a lot of space. Heavy loads of flake powder takes more space than a fine grained powder. Increase the wad pressure to 40 or more. Lower your crimp starter a little to turn in the mouth crimp in a little more. Adjust the metal crimp spindle out a little or adjust the cam as per instructions. You shouldn't be having any problems with standard 1 1/8 oz loads but large shot sizes from 6 shot up to 2 shot etc. take up more space and you need more wad pressure on those plus a powder that doesn't take a lot of space. Some new shotgun hulls are finicky and harder to crimp. Winchesters new high speed 2 piece hull is easy to crush while crimping. Sometimes for instance using Remington wads in Winchester hulls just are harder to get right. I suggest using only Remington hulls especially the STS-Nitro hulls and even Remington's Gun Club hulls load well. I'd try not to use Win's new 2 piece hull.

BigJimP · May 16, 2014, 02:59 PM

Go back thru your manual ....and adjust your crimp start and the other crimp adjustment settings...

pages 9 - 11 in your manual tell you how to do it....

If you don't have a manual, download it from MEC website...

It takes some patience ...just take your time. Standardize on one hull - and I recommend a Remington STS, Nitro hull in 2 3/4"....stay away from the rest of the hulls out there / not all 12ga hulls can be run with the same settings.

SauerGrapes · May 16, 2014, 08:26 PM

Both of the above post are correct. Could be press adjustment, could be wrong component choice.
For instance, I'll use a 1oz wad to load 7\8oz in a Win AA hulls.

May 16, 2014, 11:27 AM	#1
loademwell Senior Member Join Date: November 6, 2012 Posts: 164	MEC Sizemaster problem I cant seem to adjust this thing right. On the final crimp it deeps crushing the shell.... How on earth do you make it not do that?

May 16, 2014, 08:26 PM	#4
SauerGrapes Senior Member Join Date: March 22, 2009 Location: S.E.PA. Posts: 920	Both of the above post are correct. Could be press adjustment, could be wrong component choice. For instance, I'll use a 1oz wad to load 7\8oz in a Win AA hulls. __________________ NRA member, DCF&S member, PAFOA member, USPSA member, NSCA member R.I.P.____Murphy

May 16, 2014, 02:29 PM	#2
rg1 Senior Member Join Date: November 6, 2001 Posts: 1,125	Just a couple tips and may help? Use a powder that doesn't take up a lot of space. Heavy loads of flake powder takes more space than a fine grained powder. Increase the wad pressure to 40 or more. Lower your crimp starter a little to turn in the mouth crimp in a little more. Adjust the metal crimp spindle out a little or adjust the cam as per instructions. You shouldn't be having any problems with standard 1 1/8 oz loads but large shot sizes from 6 shot up to 2 shot etc. take up more space and you need more wad pressure on those plus a powder that doesn't take a lot of space. Some new shotgun hulls are finicky and harder to crimp. Winchesters new high speed 2 piece hull is easy to crush while crimping. Sometimes for instance using Remington wads in Winchester hulls just are harder to get right. I suggest using only Remington hulls especially the STS-Nitro hulls and even Remington's Gun Club hulls load well. I'd try not to use Win's new 2 piece hull.

May 16, 2014, 02:59 PM	#3
BigJimP Senior Member Join Date: February 23, 2005 Posts: 13,195	Go back thru your manual ....and adjust your crimp start and the other crimp adjustment settings... pages 9 - 11 in your manual tell you how to do it.... If you don't have a manual, download it from MEC website... It takes some patience ...just take your time. Standardize on one hull - and I recommend a Remington STS, Nitro hull in 2 3/4"....stay away from the rest of the hulls out there / not all 12ga hulls can be run with the same settings.