I've never loaded with 572 but...
I'd like to tell you to make sure you are using a scale to weigh the drops from whichever bushings you try.
Bushings drop VOLUME and you just need to find the right one for what weight you wish to achieve.

572 isn't on the bushing charts that I have BUT those charts are just a starting point.

Be safe!

 

I've never loaded with 572 but...
I'd like to tell you to make sure you are using a scale to weigh the drops from whichever bushings you try.
Bushings drop VOLUME and you just need to find the right one for what weight you wish to achieve.

572 isn't on the bushing charts that I have BUT those charts are just a starting point.

Be safe!

Thanks. I'm a precision rifle cartridge loader so I will make sure all is spot on.

 

There are NO SHORTCUTS - YOU CANNOT go ONLY by the powder bushing #…


Regardless of reloader brand or gauge reloading - you should “always” start with a Powder manufacturer published recipe, and from that, take the desired recipe amount of powder, and then refer to the reloader manufacturer for the “estimated” powder bushing that will get closest to the desired powder drop, and then, “test” several powder bushings by dropping and weighing 5-10 drops of powder, to find the bushing that best meets the recipe powder requirements.

The bottom line = powder bushings and drop charts are ONLY a STARTING REFERENCE POINT - bushings differ, loaders differ, powder lots differ - you simply MUST weigh powder drops prior to beginning each reloading session, and then during your reloading session, to ensure accuracy

So in your example, start here for the reloading recipe - Hodgdon just revamped their website - start here and select shotgun-get details - then select the components

h t t p s : //hodgdonreloading.com

Looks like you will want 15.5 grs of 572 powder, so then you “start” with the reloader bushing chart to find the bushing (pick the 3 bushings closest) and test drop & weigh for accuracy in YOUR loader, given YOUR bushings, and YOUR powder.

”Assuming” a MEC powder bushing -
h t t p s ://www.mecoutdoors.com/Images/uploaded/pdfs/PowderBushingChart.pdf

If your powder is not listed, you may need to guess with a starting bushing based on other powders listed, and given that, making it even MORE IMPORTANT that you test-weigh-confirm until you get the right powder drop.

—> for Hodgdon 527 - per their reloading data site —>

Gauge: 20

Lead Shot 7/8 oz.

		Load		Availability
Manufacturer	Powder	Primer	Wad		Grs.	Pressure (PSI)	Vel. (ft/s)
Winchester	572	Ched. 209	Rem. RXP20		16	8,900	1,150		Buy Now
Winchester	572	Ched. 209	Rem. RXP20		17.1	9,900	1,200		Buy Now
Winchester	572	Ched. 209	Rem. RXP20		18.2	10,900	1,250		Buy Now
Winchester	572	Ched. 209	Rem. RXP20		19.3	11,900	1,300		Buy Now
Winchester	572	Ched. 209	DRV-20		15.8	8,900	1,150		Buy Now
Winchester	572	Ched. 209	DRV-20		16.9	9,900	1,200		Buy Now
Winchester	572	Ched. 209	DRV-20		18	10,900	1,250		Buy Now
Winchester	572	Ched. 209	DRV-20		19	12,000	1,300		Buy Now
Winchester	572	Ched. 209	CB 1078-20		15.5	9,100	1,150		Buy Now
Winchester	572	Ched. 209	CB 1078-20		16.6	10,400	1,200		Buy Now
Winchester	572	Ched. 209	CB 1078-20		17.6	11,700	1,250

 

The VMD that I've computed for my lot of 572 is 0.0856 for my MEC 600Jr.. Once you know how many grains you want to drop, multiply the VMD by the grains and you will know the volume of the required bushing in CC's.

Lets say (for example) that you want 16.9 grains of 572.

0.0856 x 16.9 = 1.44664 CC's

Find the MEC bushing closest in volume to 1.44664 CC's and you have found your bushing.

My #18 3D Printed bushing comes closest, as by my measurement it's ID is 0.3364", and for 1" height this equates to a volume of 1.45647 CC's.

 

Along with my post above, there are reloading bibles from Lyman that may provide further details for you and your components.

 

Some people shouldn't be reloading, just let your squad mates know you are gonna go try out your "new loads"

 

Unfortunately, you can’t safely look at a chart, pick the indicated bushing and trust it will throw the stated weight. Also, single stage and progressives will throw markedly different weights with the same bushing. You need a set of scales to weigh charges. You may need to go up or down a number to get desired weight. Also, a new jug of powder may not come out the same either.

 

I went to the Hodgdon new and improved web site and put in the components you listed and within 2 minutes I seen that it takes 15.5 grains of Winchester 572 powder. The bushing will depend on what brand of reloader you have but they have bushing charts for most commercially available reloaders on their web site.

 

I reload this similar load, and this load can be found on the Hodgdon reloading data site.

Using a Winchester 209 primer, not Cheddite, the load calls for 15.5 grains of 572 powder. A Mec bushing #15 drops correctly for my current lot of powder.

This is only a starting point to weight on the scales and adjust accordingly before dropping it in the shell. Remember also, the Cheddite primer could increase this pressure above the 8,100 psi that is referenced for the Winchester primer.

 

The Hodgdon load data I posted above specifies a Cheddite primer as well as the OP’s specified components.

As i and others have stated - you still MUST weigh Powder drops and adjust with the applicable powder bushing in your reloader, to achieve the appropriate powder drop for the load. No crazy math, formula, or algorithm necessary.

 

Guys are all giving you the correct advice… throw a bunch of charges AND weigh them when looking for correct bushing.

If I was looking for 15.5 grs of 572 out of a MEC bushing I d be sure to have a 14, 15 and 16 in my assortment that I could try and weigh charges off of.

Not preaching to the choir but I ve seen two exact numbered bushings ( factory ones, unmodified) throw slightly different charges!! Why everyone says to weigh your bushing throws, don’t rely on a chart, personal assurances, etc. as said info may be a good guide but only as a starting point!

Good Luck

 

• Pick the bushing for the powder from the MEC bushing chart
• Install the bushing and drop a few times and weigh them to be sure it’s close. If not try another bushing and drop several more times and weigh it. Pick that bushing the drops the closest to what your recipe says.
• Run a few shells and recheck the drop weight.
• Run a box and check the drop again then proceed
• Check drop every 2-3 boxes

I dont drop the finished shells into a bucket like many people do. I date and number each box and I fill each box sequentially so if there is a problem I know when it started and ended
I used to shoot with a guy who screwed up 18 flats of shells because he wasn't paying attention to his MEC while he was trying so set some kind of reloading record for himself or some thing and every box had a few poofers. I didnt like to squad with the guy.

 

Bushing charts just get you in the ballpark. I recently started using 700x and I found the bushing charts to be 2-3 sizes off. I actually have two different charts and even they don't agree with each other. Just use your scale after consulting a chart to get started.