I wonder if you were loading this in 2 5/8" hulls if you would need the filler at all...

I use a #20 bushing with WSH that’s supposed to be about 18.6 grains . Tried that charge with both hulls using both wads .

Hello, I am new to reloading 10ga but not reloading. Recently got a 1860 Parker Brothers 10 ga, bottom lock, that I love and want to shoot it more. Looking to shoot in the upcoming Fall Side by Side. But I am *really* struggling to find 10ga components - I knew it would be difficult but I had no idea! Reading through this thread I can get most of these components except the Red Dot; as noted Alliant will not have for a while.

Reading 6pt-Sika's post, I want to make sure I am understanding this, using WSH, 21.7 gr for this load. Is that right?

I load WSH a **lot** for my 12ga reloads and have plenty. Would be great if I could use this for a 10ga load.

From this thread, I am thinking the recipe would be:
10ga Cheddite Hull 2 7/8"
Cheddite 209
21.7 gr WSH (Winchester Super Handicap)
BP-1044 with one 16ga Fiber Cushion Filler Wad 1/2" in the shot cup
1 1/8oz #7 1/2 lead
6 fold crimp

I can get everything from BPI, just want to make sure I am reading this right.

Thanks,
Eddie

Using a MEC 600 jr, you can adjust the height of the shell with the bolt and different holes at the base. I use WSF, Clays, and even Unique with great results with the BP1044 wad. My 10 is a 2 5/8" chamber. I use the 3 1/2" Cheddite hulls trimmed to 2 5/8". You can trim them to your needs.

Although I don't see any Alliant Red Dot currently available on-line I do see both Ballistic Products and Precision Reloading have Alliant Promo in stock. Promo is essentially the same as Red Dot, they advertise it can have variations from lot to lot meaning you need to weigh a charge or two from each bottle or lot to be sure you are getting the desired number of grains. 19 grains of Promo or Red Dot will deliver the same velocity and pressure but each may require a different bushing. FWIW I have never encountered that in my own use and the bushing that delivered close to 19 grains of Red Dot delivered the same weight of Promo.

Thanks! I did not realize that about Promo and Red Dot. Good to know. Looking into now.

That is good advice about measuring the loads. I do not use bushings for my competition and "old gun" loads. I powder drop and measure each charge. Takes much longer but I guess that's the engineer in me (and once had a squib load in a tournament...). Thanks!

May be 2 5/8"!?
 

You may want to double check the chamber length. 2 5/8" was standard early on. Then someone may have lengthened them to to 2 7/8".

Nope not 21.7 I use the #20 bushing and the table says I think 18.6 grains I’ve never bothered to weigh it . Seems to me I used the same charge with 1 1/8 ounces and just changed the displacement wads a bit . I’ve done this loading for 1 or 1 1/8 in both Cheddar and REM hulls using SP-10 and the BPI only thing that changes is the displacement wads . And granted this is what I’ve done for myself I’m
Not advocating anyone use my data but it’s worked for me . Use at your own risk . I kinda work on the premise of it went thru a 12 gauge hole and the pressure wasn’t great going thru a larger 10 gauge hole it should be no greater than and most likely a bit less pressure wise . Now one day that might jump up and bite me but I kinda doubt it .

Always weigh the charges! Machining differences can cost you the firearm, your fingers, eyes, or even your life.