I am away from home right now but Sharpe's Complete Guide to Handloading has Lot's of squib loads. Will look this weekend. My 32/40 125 gr fixed bullet squib load came from Sharpe's  He called it "good for killing hogs"

Way I just loaded squibs for the 35 Remington was look at all the old manuals.  Figure the parameters for Unique. Then at the range with a Bonanza fixed rotor powder measure loaded with Unique and the Lee Nutcracker hand tool loaded cartridges 5 at a time. Went up  through the Bonanza's rotors until they "cracked" or Supersonic. Then back down to just sub sonic.  That seems to be the best velocity for Squib loads,  sub sonic like a standard velocity .22 Rimfire.

Hope to see you at Conestoga

Boats

Or, if all else fails, .   .   .I have a 257" Lyman mould for the Loverin style bullet which I had shooting fairly well and which I could sacrifice to be reduced in length incrementally until I arrived at the right weight Squib bullet .

As a matter of fact, that mould has a gas check base, so hey, why not mill that bottom of the mould off, and through the process of elimination, I will arrive at a 55 to 60 Gr squib bullet.

 Creedmoormatch

For my 25/20ss, I machined off the gas check on the Lyman 257420 mold. That gives me a bullet that's .259 dia and .500 lg. It weights 59gr in 22/1 (smaller and heavier in 40/1). My std load is 5.0gr Unique but, for the squib I'd use 3.0gr BSed, for about 1000+

CMM, have you looked at the little round nose bullets/moulds designed for the .25 ACP?  No good for outdoors, but should make a dandy squib load sorta like the "collar button" .45-70s.  Just a wild hair...

Froggie

Creedmore, 

At Conestoga  or the other Gallery Clubs I never see anybody breechseat. It may be against club rules not sure. However given the indoor range moving gear on and off the firing line to accommodate shooters and fact they cut the lights off during the relay it would be pretty hard to do.

I run my squibs fixed

Boats